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Enhanced mechanical properties of near-α Ti60 alloy by laser powder bed fusion SCIE
期刊论文 | 2025 , 35 , 3968-3979 | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
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Abstract :

The near-alpha Ti60 alloy, renowned for its exceptional high-temperature performance, is highly sought after for aerospace applications. This study optimized the laser powder bed fusion (LPBF) parameters to fabricate Ti60 alloy with a density approaching 99.84 %. The rapid solidification process inherent to LPBF results in an ultrafine martensitic microstructure within the Ti60 alloy, characterized by the presence of intricate alpha ' martensite laths within the (3 columnar grains. The alloy's crystallographic structure is distinguished by a high density of dislocations and twins, which significantly augment its mechanical properties at both ambient and elevated temperatures. At room temperature, the alloy exhibits a tensile strength of 1402 MPa coupled with a elongation of 12.3 %. At 600 degrees C, these values increase to 686 MPa and 25.6 % elongation, respectively. These findings have the potential to significantly advance the application of LPBF-ed Ti60 alloy in the aerospace sector, while also offering a pivotal reference for the additive manufacturing of other high-performance titanium alloys.

Keyword :

Laser powder bed fusion Laser powder bed fusion Mechanical properties Mechanical properties Microstructure Microstructure Ti60 alloy Ti60 alloy

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GB/T 7714 Chi, Shan , Zhu, Rongtao , Du, Peng et al. Enhanced mechanical properties of near-α Ti60 alloy by laser powder bed fusion [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2025 , 35 : 3968-3979 .
MLA Chi, Shan et al. "Enhanced mechanical properties of near-α Ti60 alloy by laser powder bed fusion" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 35 (2025) : 3968-3979 .
APA Chi, Shan , Zhu, Rongtao , Du, Peng , Yuan, Bo , Peng, Can , Zhang, Liang et al. Enhanced mechanical properties of near-α Ti60 alloy by laser powder bed fusion . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2025 , 35 , 3968-3979 .
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Enhanced mechanical properties of near-α Ti60 alloy by laser powder bed fusion EI
期刊论文 | 2025 , 35 , 3968-3979 | Journal of Materials Research and Technology
Enhanced mechanical properties of near-α Ti60 alloy by laser powder bed fusion Scopus
期刊论文 | 2025 , 35 , 3968-3979 | Journal of Materials Research and Technology
Study on a facile method of in-situ fabricating enhanced corrosion protection LDH/PEO composites coating on Mg alloy and its growth behavior SCIE
期刊论文 | 2025 , 500 | SURFACE & COATINGS TECHNOLOGY
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Abstract :

In order to achieve in-situ growth of layered double hydroxides (LDH) film on plasma electrolytic oxidation (PEO) coating of AZ31B magnesium alloy under mild conditions, a facile method was used in this work, that is ethylenediaminetetraacetic acid (EDTA)-assisted growth method. Compared to the conventional hydrothermal method, the fabrication of LDH/PEO composite coating by this method does not require a high temperature and high pressure environment and is not constrained by the size of the reactor. Furthermore, the obtained LDH/PEO composite coating exhibits enhanced corrosion protection, which will be widely applied in corrosion protection field of surface engineering. In this work, an effective strategy to control the dissolution of PEO coating and the growth of LDH film by regulating the concentration of EDTA was proposed, after revealing the growth behavior of LDH on PEO coating during this facile fabrication process. The growth behavior of LDH film can be briefly summarized in three stages: PEO coating dissolution, LDH nucleation, and LDH growth. Interestingly, the growth mechanism of LDH was changed with EDTA assistance. LDH shifted from preferential growth within the micropores of the PEO coating to uniform growth. With the assistance of 0.06 M EDTA, which is optimal, the dissolution of original PEO coating provided a stable and sufficient Mg source for the growth of LDH film, resulting in a dense LDH network structure on the PEO coating. This uniformly grown LDH film could not only seal the inherent defects of the PEO coating but also exhibited the ability to adsorb corrosive anions, which increases the tortuosity and difficulty in penetration of corrosive media, significantly improving the corrosion resistance of the LDH/PEO composite coating.

Keyword :

AZ31B Mg alloy AZ31B Mg alloy Coating growth mechanism Coating growth mechanism Corrosion protection Corrosion protection EDTA EDTA Layered double hydroxides Layered double hydroxides Plasma electrolytic oxidation Plasma electrolytic oxidation

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GB/T 7714 Qiu, Wenyi , Ye, Xinglong , Liu, Yan et al. Study on a facile method of in-situ fabricating enhanced corrosion protection LDH/PEO composites coating on Mg alloy and its growth behavior [J]. | SURFACE & COATINGS TECHNOLOGY , 2025 , 500 .
MLA Qiu, Wenyi et al. "Study on a facile method of in-situ fabricating enhanced corrosion protection LDH/PEO composites coating on Mg alloy and its growth behavior" . | SURFACE & COATINGS TECHNOLOGY 500 (2025) .
APA Qiu, Wenyi , Ye, Xinglong , Liu, Yan , Lin, Bin , Chen, Junfeng , Xiao, Lei et al. Study on a facile method of in-situ fabricating enhanced corrosion protection LDH/PEO composites coating on Mg alloy and its growth behavior . | SURFACE & COATINGS TECHNOLOGY , 2025 , 500 .
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Study on a facile method of in-situ fabricating enhanced corrosion protection LDH/PEO composites coating on Mg alloy and its growth behavior EI
期刊论文 | 2025 , 500 | Surface and Coatings Technology
Study on a facile method of in-situ fabricating enhanced corrosion protection LDH/PEO composites coating on Mg alloy and its growth behavior Scopus
期刊论文 | 2025 , 500 | Surface and Coatings Technology
Modulation of Hydrogen Desorption Capability of Ruthenium Nanoparticles via Electronic Metal-Support Interactions for Enhanced Hydrogen Production in Alkaline Seawater SCIE
期刊论文 | 2025 | SMALL
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Abstract :

The development of efficient and stable electrocatalysts for the hydrogen evolution reaction (HER) is essential for the realization of effective hydrogen production via seawater electrolysis. Herein, the study has developed a simple method that combines electrospinning with subsequent thermal shock technology to effectively disperse ruthenium nanoparticles onto highly conductive titanium carbide nanofibers (Ru@TiC). The electronic metal-support interactions (EMSI) resulted from charge redistribution at the interface between the Ru nanoparticles and the TiC support can optimize hydrogen desorption kinetics of Ru sites and induce the hydrogen spillover phenomenon, thereby improving hydrogen evolution. As a result, the Ru@TiC catalyst exhibits outstanding HER activity, requiring low overpotentials of only 65 mV in alkaline seawater at the current density of 100 mA cm-2. Meanwhile, Ru@TiC demonstrates excellent stability, maintaining consistent operation at 500 mA cm(-2) for at least 250 hours. Additionally, an anion exchange membrane electrolyzer incorporating Ru@TiC operated continuously for over 500 hours at 200 mA cm-2 in alkaline seawater. This study highlights the significant potential of robust TiC supports in the fabrication of efficient and enduring electrocatalysts that enhance hydrogen production in complex seawater environments.

Keyword :

alkaline seawater electrolysis alkaline seawater electrolysis desorption kinetics desorption kinetics electronic metal-support interactions electronic metal-support interactions ruthenium nanoparticles ruthenium nanoparticles titanium carbide nanofibers titanium carbide nanofibers

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GB/T 7714 Sun, Junwei , Wang, Zhichao , Wang, Yue et al. Modulation of Hydrogen Desorption Capability of Ruthenium Nanoparticles via Electronic Metal-Support Interactions for Enhanced Hydrogen Production in Alkaline Seawater [J]. | SMALL , 2025 .
MLA Sun, Junwei et al. "Modulation of Hydrogen Desorption Capability of Ruthenium Nanoparticles via Electronic Metal-Support Interactions for Enhanced Hydrogen Production in Alkaline Seawater" . | SMALL (2025) .
APA Sun, Junwei , Wang, Zhichao , Wang, Yue , Song, Yanyan , Pei, Yi , Yan, Wensheng et al. Modulation of Hydrogen Desorption Capability of Ruthenium Nanoparticles via Electronic Metal-Support Interactions for Enhanced Hydrogen Production in Alkaline Seawater . | SMALL , 2025 .
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Modulation of Hydrogen Desorption Capability of Ruthenium Nanoparticles via Electronic Metal-Support Interactions for Enhanced Hydrogen Production in Alkaline Seawater Scopus
期刊论文 | 2025 , 21 (15) | Small
Modulation of Hydrogen Desorption Capability of Ruthenium Nanoparticles via Electronic Metal-Support Interactions for Enhanced Hydrogen Production in Alkaline Seawater Scopus
期刊论文 | 2025 , 21 (15) | Small
Effects of pre-strain deep cryogenic aging on the mechanical and corrosion properties of 2A97 aluminum-lithium alloy SCIE
期刊论文 | 2024 , 30 , 2728-2737 | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
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Abstract :

In order to improve the mechanical properties and corrosion resistance of 2A97 aluminum -lithium alloy, this research develops a novel strain heat -treatment technology. Surprisingly, 2A97 alloy treated by 4% pre -strain and 48 h deep cryogenic aging exhibits excellent mechanical properties, whose yield strength, tensile strength, and elongation are 573.7 MPa, 593.6 MPa, and 14.25%, respectively. Furthermore, the corrosion resistance of samples treated by the above pre -strain deep cryogenic aging process is two times as much as traditional T6 aged. This study deeply investigates the influence of various precipitates in 2A97 alloy on its performance through microstructure analysis. The results show that the introduction of pre -strain inhibits the precipitates of the T 1 and 8 ' phases at the grain boundaries, and prevents the formation and widening of precipitate -free zones. At the same time, it reduces the potential difference between grain boundaries and matrix, and enhances the corrosion resistance of 2A97 alloy. Deep cryogenic can inhibit recovery and maintain deformation dislocation, so that a large number of defects produced by pre -strain promote the nucleation and diffusion of precipitates in the matrix, resulting in tiny and uniformly distributed precipitates. Therefore, the novel prestrain deep cryogenic aging not only endues 2A97 alloy excellent performance, but also offers a new strategy for controlling precipitation.

Keyword :

Corrosion property Corrosion property Mechanical property Mechanical property Precipitate Precipitate Pre -strain deep cryogenic aging Pre -strain deep cryogenic aging

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GB/T 7714 Liu, Yan , Zhao, Chenxu , Chen, Junfeng et al. Effects of pre-strain deep cryogenic aging on the mechanical and corrosion properties of 2A97 aluminum-lithium alloy [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 30 : 2728-2737 .
MLA Liu, Yan et al. "Effects of pre-strain deep cryogenic aging on the mechanical and corrosion properties of 2A97 aluminum-lithium alloy" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 30 (2024) : 2728-2737 .
APA Liu, Yan , Zhao, Chenxu , Chen, Junfeng , Liu, Rongying , Jiang, Jiantang , Cui, Xiping et al. Effects of pre-strain deep cryogenic aging on the mechanical and corrosion properties of 2A97 aluminum-lithium alloy . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 30 , 2728-2737 .
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Effects of pre-strain deep cryogenic aging on the mechanical and corrosion properties of 2A97 aluminum–lithium alloy Scopus
期刊论文 | 2024 , 30 , 2728-2737 | Journal of Materials Research and Technology
Effects of pre-strain deep cryogenic aging on the mechanical and corrosion properties of 2A97 aluminum–lithium alloy EI
期刊论文 | 2024 , 30 , 2728-2737 | Journal of Materials Research and Technology
Hot deformation behavior and processing map of novel quasi-network Ti5Si3/TiAl composites SCIE
期刊论文 | 2024 , 166 | INTERMETALLICS
WoS CC Cited Count: 1
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Abstract :

The in-house fabricated quasi-network Ti5Si3/TiAl composites showed an excellent combination between light weight and superior high temperature tensile properties in our previous work. However, the deformability was another key factor which determined the Ti5Si3/TiAl composites' potential for high temperature applications in aeronautics and aerospace. Therefore, in this paper the hot deformation behaviors of the novel quasi-network Ti5Si3/TiAl composites at temperatures from 900( degrees)C to 1200( degrees)C with strain rates in the range of 0.001-1 s(-1 )was systemically investigated. The results showed that the peak flow stress decreased with the increase in the test temperature and the decrease in the strain rate. The thermal compressive deformation constitutive equation was built, and hence the deformation activation energy of the quasi-network Ti5Si3/TiAl composite was confirmed to be 564.67 kJ/mol, slightly higher than or similar to the TiAl-based alloys fabricated by traditional casting or powder metallurgy. According to the dynamic material model (DMM), the hot processing maps with the true strain of 0.2-0.5 were established. It can be concluded that the instability area was mainly concentrated in the region of low temperature and high strain rate. Combined with the microstructural analysis, the optimal hot processing parameters were the temperature range of 1125-1200( degrees)C and the strain rate of 0.001-0.01 s(-1), where a large proportion of dynamic recrystallization occurred. It was noteworthy that the introduction of Ti5Si3 particles was conducive to accelerating the dynamic recrystallization and limiting the dynamic recrystallization grain growth. Besides, the distribution and size of Ti(5)Si(3 )particles could be regulated by the hot deformation. Finally, the microstructure evolution mechanism in the hot deformation was discussed in detail, this additionally provided the guidance for the practical plastic forming.

Keyword :

Deformation activation energy Deformation activation energy Dynamic recrystallization Dynamic recrystallization Hot processing map Hot processing map Quasi-network structure Quasi-network structure Ti (5) Si- 3 /TiAl composite Ti (5) Si- 3 /TiAl composite

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GB/T 7714 Gao, Naonao , Cui, Xiping , Luo, Jiawei et al. Hot deformation behavior and processing map of novel quasi-network Ti5Si3/TiAl composites [J]. | INTERMETALLICS , 2024 , 166 .
MLA Gao, Naonao et al. "Hot deformation behavior and processing map of novel quasi-network Ti5Si3/TiAl composites" . | INTERMETALLICS 166 (2024) .
APA Gao, Naonao , Cui, Xiping , Luo, Jiawei , Zhai, Xiangxin , Zhang, Taiquan , Wang, Zhiqi et al. Hot deformation behavior and processing map of novel quasi-network Ti5Si3/TiAl composites . | INTERMETALLICS , 2024 , 166 .
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Hot deformation behavior and processing map of novel quasi-network Ti5Si3/TiAl composites Scopus
期刊论文 | 2024 , 166 | Intermetallics
Hot deformation behavior and processing map of novel quasi-network Ti5Si3/TiAl composites EI
期刊论文 | 2024 , 166 | Intermetallics
Effect of Loading Direction on Tensile-Compressive Mechanical Behaviors of Mg-5Zn-2Gd-0.2Zr Alloy with Heterogeneous Grains SCIE
期刊论文 | 2024 , 14 (10) | CRYSTALS
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Abstract :

The tension-compression yield asymmetry caused by the strengthening of Mg-Zn-Gd-Zr alloy due to extrusion deformation is an important issue that must be addressed in its application. In this study, the effects of loading direction on the tensile and compressive mechanical behaviors of Mg-5Zn-2Gd-0.2Zr alloy were systematically investigated. As the loading angle (the angle between the loading direction and the extrusion direction) increases from 0 degrees to 30 degrees, 45 degrees, 60 degrees and 90 degrees, the tensile yield strength decreases more significantly than the compressive yield strength. Consequently, the tension-compression yield asymmetry is gradually improved. Additionally, the ultimate compressive strength decreases more markedly than the ultimate tensile strength with the increment of the loading angle. In tensile tests conducted at 0 degrees, 30 degrees and 45 degrees, two distinct stages of decreasing strain hardening rates are typically observed. For the 60 degrees and 90 degrees tensile tests, one unusual ascending stage of strain hardening rate is observed. For all compressive tests, three stages of strain hardening are consistently noted; however, the increment in strain hardening rate caused by {10-12} extension twinning decreases with the increasing loading angle. A model combining loading angle and Schmid factor distribution was established. The calculated results indicate that the dominant deformation modes during the yielding process also vary significantly with the loading conditions. This clarification highlights the differences in yield strength variations between tension and compression. Finally, an analysis of the plane trace and crack propagation direction near the fracture surface reveals the fracture mechanisms associated with tensile and compressive tests at different loading directions. This study promotes understanding of the mechanical behaviors of Mg-5Zn-2Gd-0.2Zr alloy under different loading directions, and helps to thoroughly elucidate the anisotropic effects of texture on the mechanical properties of magnesium alloys.

Keyword :

fracture mechanism fracture mechanism heterogeneous grains heterogeneous grains magnesium alloy magnesium alloy strain hardening strain hardening tensile and compressive strength tensile and compressive strength

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GB/T 7714 Chen, Jieming , Xiao, Lei , Wang, Xuefang et al. Effect of Loading Direction on Tensile-Compressive Mechanical Behaviors of Mg-5Zn-2Gd-0.2Zr Alloy with Heterogeneous Grains [J]. | CRYSTALS , 2024 , 14 (10) .
MLA Chen, Jieming et al. "Effect of Loading Direction on Tensile-Compressive Mechanical Behaviors of Mg-5Zn-2Gd-0.2Zr Alloy with Heterogeneous Grains" . | CRYSTALS 14 . 10 (2024) .
APA Chen, Jieming , Xiao, Lei , Wang, Xuefang , Li, Zhuo , Wang, Chen , Wang, Bingshu et al. Effect of Loading Direction on Tensile-Compressive Mechanical Behaviors of Mg-5Zn-2Gd-0.2Zr Alloy with Heterogeneous Grains . | CRYSTALS , 2024 , 14 (10) .
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Effect of Loading Direction on Tensile-Compressive Mechanical Behaviors of Mg-5Zn-2Gd-0.2Zr Alloy with Heterogeneous Grains Scopus
期刊论文 | 2024 , 14 (10) | Crystals
Polyoxometalate-derived anti-aggregation MoC nanoparticles for efficient hydrogen evolution in basic and acidic media EI
期刊论文 | 2024 , 973 | Journal of Electroanalytical Chemistry
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As a cost-effective alternative to Pt-based catalysts, molybdenum carbide (MoC) exhibits considerable potential for catalysing hydrogen evolution reaction (HER) in both alkaline water electrolyzers and proton exchange membrane water electrolyzers. However, achieving ampere-level current densities at low overpotentials remains challenging for MoC-based electrocatalysts. In this study, we utilized electrospinning technology followed by a subsequent heat treatment to successfully synthesize monodisperse MoC nanoparticles (approximately 4.3 nm) embedded in carbon nanofibers. The resultant self-supporting one-dimensional molybdenum carbide@nitrogen-doped carbon nanofiber (MoC-A@NCNF), prepared with polyoxometalate anion (POM) and polyvinylpyrrolidone (PVP), exhibits excellent anti-aggregation behavior. Benefiting from its high specific surface area and one-dimensional conductive network structure, the MoC-A@NCNF displays outstanding hydrogen evolution reaction (HER) performance in both 1 M KOH and 0.5 M H2SO4, achieving overpotentials of 491 mV and 568 mV at a current density of 1 A cm−2, respectively. Furthermore, it exhibits exceptional electrochemical stability during prolonged HER testing under both acidic and alkaline conditions. © 2024

Keyword :

Cost effectiveness Cost effectiveness Hydrogen evolution reaction Hydrogen evolution reaction Platinum alloys Platinum alloys Platinum compounds Platinum compounds Potassium hydroxide Potassium hydroxide

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GB/T 7714 Sun, Junwei , Li, Xiaoming , Wang, Yue et al. Polyoxometalate-derived anti-aggregation MoC nanoparticles for efficient hydrogen evolution in basic and acidic media [J]. | Journal of Electroanalytical Chemistry , 2024 , 973 .
MLA Sun, Junwei et al. "Polyoxometalate-derived anti-aggregation MoC nanoparticles for efficient hydrogen evolution in basic and acidic media" . | Journal of Electroanalytical Chemistry 973 (2024) .
APA Sun, Junwei , Li, Xiaoming , Wang, Yue , Yang, Juan , Luo, Hongwei , Zhang, Xiaoyan et al. Polyoxometalate-derived anti-aggregation MoC nanoparticles for efficient hydrogen evolution in basic and acidic media . | Journal of Electroanalytical Chemistry , 2024 , 973 .
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Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel SCIE
期刊论文 | 2024 , 30 , 4800-4812 | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
WoS CC Cited Count: 2
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To achieve high thermal efficiency, today's nuclear reactor structures are exposed to higher temperatures and pressures, which requires the use of high-strength steels with specific properties, such as ODS steels. There is a need to clarify the evolution of the microstructure and properties of steels at elevated temperatures. This study systematically investigates the evolution of microstructure, texture, and mechanical property variations of 12CrODS steels after hot-rolling and subsequent annealing at 1000 degrees C and 1200 degrees C. The investigation utilizes optical microscopy, electron backscatter diffraction technique, and mechanical property measurements. The microstructure of hot-rolled samples shows a layered alternating distribution, which is distinguished by a notable presence of the alpha-fiber texture. Following annealing at 1000 degrees C, the martensite grains are smaller with a reduced hardness, while maintaining a strong alpha-fiber texture. After annealing at 1200 degrees C, there is a rapid increase in the growth of martensite grains, a significant rise in hardness, a reduction in the alpha-fiber texture characteristics, and an improvement in the gamma-fiber texture characteristics. Moreover, the maximum intensity of the alpha-fiber texture diminishes as the annealing temperature increases. The mechanical properties of the samples deteriorated after annealing at 1200 degrees C, which can be attributed to the coarse martensite grains and the texture components containing the {001} cleavage plane dominating the occurrence of brittle cleavage fracture. The 0.1Y sample after annealing at 1000 degrees C exhibits an excellent combination of strength (1458 MPa) and ductility (20.3%), which is owing to the unique heterogeneous grain structure and the evolution of favorable texture.

Keyword :

Annealing Annealing Mechanical properties Mechanical properties Microstructure characteristics Microstructure characteristics ODS steel ODS steel Texture Texture

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GB/T 7714 Li, Jiajie , Chen, Jingxian , You, Zhangjing et al. Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 30 : 4800-4812 .
MLA Li, Jiajie et al. "Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 30 (2024) : 4800-4812 .
APA Li, Jiajie , Chen, Jingxian , You, Zhangjing , Deng, Liping , Wang, Chen , Chen, Junfeng et al. Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 30 , 4800-4812 .
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Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel EI
期刊论文 | 2024 , 30 , 4800-4812 | Journal of Materials Research and Technology
Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel Scopus
期刊论文 | 2024 , 30 , 4800-4812 | Journal of Materials Research and Technology
Significant enhancement in high temperature performance of TiAl matrix composites by a novel configuration design SCIE
期刊论文 | 2024 , 889 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
WoS CC Cited Count: 5
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Ti5Si3/TiAl composites were successfully prepared by pressure infiltration and subsequent reactive annealing. Final microstructure of Ti5Si3/TiAl composites was dependent on the reactive annealing temperature, which varied from 1350 degrees C to 1420 degrees C, two typical microstructures could be achieved: (i) An unique core-shell structure (Core: fully lamellar alpha 2-Ti3Al/gamma-TiAl with in-situ synthesized Ti5Si3 particles predominantly distributed at the interfaces of alpha 2/gamma lamellar colonies; Shell: equiaxed gamma-TiAl with Ti5Si3 particles distributed in gamma grain boundaries); And (ii) A novel quasi-network structure composed of fully lamellar alpha 2/gamma and a majority of Ti5Si3 particles with a quasi-network distribution. The formation of the two microstructures could be attributed to the chemical composition heterogeneity which was caused by the difference in interdiffusion rate of Ti and Al elements in different annealing temperatures. The comparative investigations on high temperature tensile properties and creep behavior showed that the core-shell Ti5Si3/TiAl composites exhibited a better specific strength (165 MPa center dot g- 1 center dot cm3) and higher ultimate tensile strength (633 MPa) at 800 degrees C, which was 12 % higher than that of the quasi-network Ti5Si3/TiAl composites. While the creep behavior analysis showed that in compassion with equiaxed gamma phase, the slip distance of dislocations in fully lamellar alpha 2/gamma phase was shorter, impeding the motion of dislocations more effectively. And core-shell Ti5Si3/TiAl composites possessed a large number of grain boundaries concentrating in the shell which became weaker in the high temperature, facilitating the formation of creep pores in the shell and the final premature fracture. Hence, the quasi-network Ti5Si3/TiAl composites containing a higher content of fully lamellar alpha 2/gamma exhibited a better creep resistance than that of core-shell Ti5Si3/TiAl composites. More importantly, the steady state creep rate at 750 degrees C under the fixed stress of 250 MPa of quasi-network Ti5Si3/TiAl composites was relatively low, only 3.305 x 10-8 s- 1, comparable to that of third-generation TiAl alloys.

Keyword :

Core-shell Core-shell Creep behavior Creep behavior High temperature tensile High temperature tensile Quasi-network Quasi-network Reactive annealing Reactive annealing

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GB/T 7714 Zhang, Yuanyuan , Cui, Xiping , Zhai, Xiangxin et al. Significant enhancement in high temperature performance of TiAl matrix composites by a novel configuration design [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2024 , 889 .
MLA Zhang, Yuanyuan et al. "Significant enhancement in high temperature performance of TiAl matrix composites by a novel configuration design" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 889 (2024) .
APA Zhang, Yuanyuan , Cui, Xiping , Zhai, Xiangxin , Luo, Jiawei , Zhang, Taiquan , Wang, Zhiqi et al. Significant enhancement in high temperature performance of TiAl matrix composites by a novel configuration design . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2024 , 889 .
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Significant enhancement in high temperature performance of TiAl matrix composites by a novel configuration design Scopus
期刊论文 | 2024 , 889 | Materials Science and Engineering: A
Significant enhancement in high temperature performance of TiAl matrix composites by a novel configuration design EI
期刊论文 | 2024 , 889 | Materials Science and Engineering: A
基于本科教学开展"本硕贯通"拔尖人才培养的探索
期刊论文 | 2024 , (23) , 98-101 | 中国现代教育装备
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Abstract :

结合福州大学材料科学与工程专业所采取的培养模式,从联通本硕教学、改革人才培养模式,强化创新理念、构建联通研究生教育的本科课程体系,打造系统化科研创新实践平台、培养学生的创新实践能力方面构建"本硕贯通"式拔尖人才培养模式.在不断探索、实践的过程中形成了自身独特的运行模式,制订出具有专业特色的本科培养方案,构建了"本硕贯通"的课程体系,打造了开放式的科研创新平台,并把科研训练环节作为"本硕贯通"拔尖人才培养的核心环节,以期培养出高层次、学术研究型拔尖人才.

Keyword :

实践教学 实践教学 拔尖人才培养 拔尖人才培养 本硕贯通 本硕贯通 材料科学与工程专业 材料科学与工程专业 课程体系 课程体系

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GB/T 7714 陈玉龙 , 陈俊锋 , 萨百晟 . 基于本科教学开展"本硕贯通"拔尖人才培养的探索 [J]. | 中国现代教育装备 , 2024 , (23) : 98-101 .
MLA 陈玉龙 et al. "基于本科教学开展"本硕贯通"拔尖人才培养的探索" . | 中国现代教育装备 23 (2024) : 98-101 .
APA 陈玉龙 , 陈俊锋 , 萨百晟 . 基于本科教学开展"本硕贯通"拔尖人才培养的探索 . | 中国现代教育装备 , 2024 , (23) , 98-101 .
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