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Achieving low tension-compression yield asymmetry and ultrahigh strength in Mg-1Al-1Ca-0.2Mn (wt%) alloy via sub-micron grain refinement SCIE
期刊论文 | 2024 , 28 , 2235-2246 | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
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Abstract :

Traditional low-alloyed Mg-Al-Ca-Mn extrusion alloys always show a low strength and a high tension compression yield asymmetry. In the present work, Mg-1Al-1Ca-0.2Mn (AXM1102, wt.%) alloys were extruded at 150-350 degrees C to produce different grain structure and mechanical properties. It is shown that AXM1102-150 (extruded at 150 degrees C) sample exhibits superhigh strength in both tension and compression, which exhibited a yield strength (YS) of 428 MPa in tension and 416 MPa in compression. Namely, ultrahigh strength and low tension-compression yield asymmetry were both obtained. The ultrahigh strength was found to be ascribed to the ultra-fine dynamically recrystallized (DRXed) grains (0.47 mu m) together with grain boundary co segregation of Ca and Al atoms. Submicron DRXed grains accounts for the improved tension-compression yield asymmetry through suppressing {10-12} twining during compression. Additionally, the discontinuous yielding was detected during tension of AXM1102-150 alloy, which is potentially related with the high energy barrier required for dislocation emission caused by grain boundary co-segregation of Al and Ca atoms. Once the tensile stress reaches the peak value, the mobile dislocation density increases immediately, thus the tensile stress-strain behavior of the AXM1102-150 alloy is dominated by strain softening. The results indicate that low-alloyed Mg-Al-Ca-Mn alloys demonstrate tremendous potential as next generation ultrahigh-strength and low tension-compression yield asymmetry wrought Mg alloys.

Keyword :

Discontinuous yielding Discontinuous yielding Extrusion temperature Extrusion temperature Tension-compression yield asymmetry Tension-compression yield asymmetry Ultrahigh strength Ultrahigh strength Wrought Mg alloy Wrought Mg alloy

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GB/T 7714 Liu, Xiaoqing , Qiao, Xiaoguang , Zhang, Xianke et al. Achieving low tension-compression yield asymmetry and ultrahigh strength in Mg-1Al-1Ca-0.2Mn (wt%) alloy via sub-micron grain refinement [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 28 : 2235-2246 .
MLA Liu, Xiaoqing et al. "Achieving low tension-compression yield asymmetry and ultrahigh strength in Mg-1Al-1Ca-0.2Mn (wt%) alloy via sub-micron grain refinement" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 28 (2024) : 2235-2246 .
APA Liu, Xiaoqing , Qiao, Xiaoguang , Zhang, Xianke , Zhang, Dongdong , Xiao, Lei , Zhong, Wojun et al. Achieving low tension-compression yield asymmetry and ultrahigh strength in Mg-1Al-1Ca-0.2Mn (wt%) alloy via sub-micron grain refinement . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 28 , 2235-2246 .
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Asymmetric tension-compression mechanical behaviors of extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy with double-peak fiber texture SCIE
期刊论文 | 2024 , 989 | JOURNAL OF ALLOYS AND COMPOUNDS
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Abstract :

To clarify asymmetric mechanical behaviors of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy during room temperature tension and compression, the evolution of microstructure, texture and strain hardening rate were systematically investigated when loading along the extrusion direction (ED). The results found that the asextruded alloy exhibited <1010>-<1120> double-peak fiber texture, leading to obvious tension compression yield asymmetry and compressive yield plateau. Fiber texture kept stable and only texture intensity gradually decreased with the increasing tensile strain, while fiber texture was exhausted due to the extension twinning and <0001> texture component was aggravated with the increasing compressive strain. Moreover, twinning parts within grains with <1010> fiber texture was re-oriented to the c-axis paralleling to the ED, and that in <1120> fiber texture deviated about 30 degrees away from the ED. This soft orientation would be finally rotated to the <0001> paralleling to the ED under the action of basal slip, explaining why the <0001> pole dispersed at first and then concentrated with the increasing compressive strain. Three stages of strain hardening rate were both observed for tensile and compressive tests, while increment of Stage II was only observed under compression. Stage II in compression could be further divided into two parts with different slopes. Such phenomenon was seldom reported in Mg alloys, which was caused by different propagation and re-orientation of extension twinning in double-peak fiber texture, and weakened the effect of twin lamella segmentation with the increasing compressive strain. Findings in this work given us a better understanding of asymmetric tensile-compressive mechanical behaviors of extruded Mg alloys with double-peak fiber texture.

Keyword :

Extension twinning Extension twinning Microstructure Microstructure Strain hardening Strain hardening Tension and compression asymmetry Tension and compression asymmetry Texture evolution Texture evolution

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GB/T 7714 Kan, Zhiyong , Yang, Guangyu , Xiao, Lei et al. Asymmetric tension-compression mechanical behaviors of extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy with double-peak fiber texture [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 989 .
MLA Kan, Zhiyong et al. "Asymmetric tension-compression mechanical behaviors of extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy with double-peak fiber texture" . | JOURNAL OF ALLOYS AND COMPOUNDS 989 (2024) .
APA Kan, Zhiyong , Yang, Guangyu , Xiao, Lei , Wang, Chunhui , Qin, He , Wang, Bingshu et al. Asymmetric tension-compression mechanical behaviors of extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy with double-peak fiber texture . | JOURNAL OF ALLOYS AND COMPOUNDS , 2024 , 989 .
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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: 1
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Abstract :

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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A Study of {10-12} Twinning Activity Associated with Stress State in Mg-3Al-1Zn Alloy during Compression SCIE
期刊论文 | 2024 , 14 (5) | METALS
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Abstract :

An eight-sided prism sample, obtained from a hot-rolled AZ31 magnesium alloy sheet, was compressed at room temperature along the transverse direction to investigate the influence of local strain on twinning behavior using electron backscatter diffraction (EBSD) measurements, hardness distribution, and metallographic observations. The octagonal surface of the sample was divided into distinct regions based on hardness distribution and metallographic observations. Combined analysis of the Schmid factor (SF) and the strain compatibility factor (m') was employed to study twin variant selection. Basal on SF ratio distribution, the Schmid factor criterion, can predict over 75% of observed twin variants in regions A and D (normal stress samples). In contrast, 64% of twin variant selection behavior in region C (shear stress sample) can be effectively explained using a pure shear model. Twin variants with high strain compatibility factors may prefer activation to reduce stress concentration. The strain compatibility factor is more appropriate than the Schmid factor for analyzing the effect of local strain on the selection behavior of twin variants.

Keyword :

AZ31 magnesium alloy AZ31 magnesium alloy local strain state local strain state Schmid factor Schmid factor strain compatibility factor strain compatibility factor twin variants selection twin variants selection

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GB/T 7714 Lu, Boqin , Wang, Wei , Yao, Jinyi et al. A Study of {10-12} Twinning Activity Associated with Stress State in Mg-3Al-1Zn Alloy during Compression [J]. | METALS , 2024 , 14 (5) .
MLA Lu, Boqin et al. "A Study of {10-12} Twinning Activity Associated with Stress State in Mg-3Al-1Zn Alloy during Compression" . | METALS 14 . 5 (2024) .
APA Lu, Boqin , Wang, Wei , Yao, Jinyi , Deng, Liping , Xiao, Lei , Wang, Bingshu . A Study of {10-12} Twinning Activity Associated with Stress State in Mg-3Al-1Zn Alloy during Compression . | METALS , 2024 , 14 (5) .
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Effects of Hf addition on the microstructure and properties of Cu-Sn-P alloy EI
期刊论文 | 2024 , 33 , 2981-2988 | Journal of Materials Research and Technology
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Abstract :

In this paper, the effects of Hf addition on the mechanical properties, electrical conductivity and microstructure of Cu-Sn-P alloy were investigated. The results show that the Hf addition can enhance the mechanical properties and electrical conductivity of Cu-Sn-P alloy. The alloy with 0.05 wt% Hf exhibits the best comprehensive performance with yield strength of 625 MPa, tensile strength of 661 MPa and electrical conductivity of 16.8 %IACS. Compared with the Cu-Sn-P alloy without Hf addition, the yield strength and tensile strength are increased by 8.4% and 7.8%, and the electrical conductivity is increased by 24.4%. The increase in the strength of Hf-added alloy can be attributed to the synergistic effect of multiple strengthening mechanisms, including fine grain strengthening, twin strengthening, dislocation strengthening, precipitation strengthening and Σ3n (n = 1, 2, 3) grain boundary strengthening. Moreover, the Hf-P precipitates can be observed in the Hf-added alloy. According to the amount of Hf addition, these precipitates can manifest as the fine HfP2 phase and the coarse HfP phase. The formation of Hf-P precipitates contributes to the precipitation strengthening and the purification of Cu matrix, thus contributing to the improvement of strength and conductivity. © 2024 The Authors

Keyword :

Copper alloys Copper alloys Electric conductivity Electric conductivity Hafnium alloys Hafnium alloys Lead alloys Lead alloys Tensile strength Tensile strength Tin alloys Tin alloys Yield stress Yield stress

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GB/T 7714 Wei, Biao , Yang, Haoren , Wang, Chen et al. Effects of Hf addition on the microstructure and properties of Cu-Sn-P alloy [J]. | Journal of Materials Research and Technology , 2024 , 33 : 2981-2988 .
MLA Wei, Biao et al. "Effects of Hf addition on the microstructure and properties of Cu-Sn-P alloy" . | Journal of Materials Research and Technology 33 (2024) : 2981-2988 .
APA Wei, Biao , Yang, Haoren , Wang, Chen , Zhou, Jianhui , Xiao, Lei , Ma, Tianyu et al. Effects of Hf addition on the microstructure and properties of Cu-Sn-P alloy . | Journal of Materials Research and Technology , 2024 , 33 , 2981-2988 .
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Dynamic mechanical behavior of titanium matrix composites reinforced with graphene nanoplatelets Scopus
期刊论文 | 2024 , 914 | Materials Science and Engineering: A
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In this investigation, graphene nanoplatelets reinforced pure titanium matrix (GNPs/TA1) composites were synthesized via short-term ball milling followed by spark plasma sintering. The mechanical properties and microstructure evolution of these composites were examined under both quasi-static and dynamic compression conditions. The results indicate that as the strain rate increases from 10−3 to 3000 s−1, the yield strength rises from 436.9 MPa to 1209.6 MPa, consistent with the positive strain rate effect. The superior yield strength of GNPs/TA1 composites arises from the dynamic Hall-Petch effect, dislocation strengthening and load transfer strengthening, with the contribution from load transfer strengthening being the most significant due to the reinforcement's (TiC-GNPs-TiC) facilitation of load transfer. As the strain rate increases, interfacial debonding gradually extends along the reinforcement and grain boundaries, but no macroscopic fracture occurred in this study. At a strain rate of 3000 s−1 during compression, {112‾2}, {101‾2}, and {11 2‾ 1} twins were generated. However, at a strain rate of 10 s−1, only {112‾2} and {101‾2} twins were produced, while {11 2‾ 1} twin was inhibited. Under high strain rate loading, the plastic flow behavior of GNPs/TA1 composites was predicted using the Johnson-Cook constitutive model, modified to account for adiabatic temperature rise, and the predictions showed good agreement with experimental results. © 2024 Elsevier B.V.

Keyword :

Dynamic compression Dynamic compression Graphene nanoplatelets Graphene nanoplatelets Microstructure Microstructure Titanium matrix composites Titanium matrix composites

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GB/T 7714 Feng, T. , Pan, Z. , Yan, S. et al. Dynamic mechanical behavior of titanium matrix composites reinforced with graphene nanoplatelets [J]. | Materials Science and Engineering: A , 2024 , 914 .
MLA Feng, T. et al. "Dynamic mechanical behavior of titanium matrix composites reinforced with graphene nanoplatelets" . | Materials Science and Engineering: A 914 (2024) .
APA Feng, T. , Pan, Z. , Yan, S. , Wang, J. , Ren, J. , Xiao, L. et al. Dynamic mechanical behavior of titanium matrix composites reinforced with graphene nanoplatelets . | Materials Science and Engineering: A , 2024 , 914 .
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Formation of gradient microstructure and elimination of tension-compression yield asymmetry of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy via free-end torsion SCIE
期刊论文 | 2023 , 883 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
WoS CC Cited Count: 1
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Evident tension-compression yield asymmetry limited the potential use of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy as a structural material. Pre-torsion deformation (free-end torsion) was conducted on the extruded alloy and its effects on microstructure and tensile-compressive mechanical properties were investigated in this study. It was found that the as-extruded alloy exhibited homogenous microstructure and <100> - <110 > double-peak fiber texture. Gradient structures along the radial direction were formed after pre-torsion, which contained gradient distribution of dislocations, grain size, {102} extension twin lamellas and texture components. <100> - <110 > double-peak fiber texture was gradually weakened with the torsional angle increasing from 90 degrees to 135 degrees and 180 degrees, and it was related with the re-orientation of extension twinning and dislocation movement. Moreover, extension twinning was more easily to be activated in grains with <110> fiber texture component, and this phenomenon was revealed by calculating the global Schmid factor of extension twinning under pure shear stress state. Tensile and compressive yield strength increased monotonically with the increasing torsional angle. Meanwhile, ductility almost remained unchanged. Tension-compression yield asymmetry was gradually reduced, and it was eliminated after 180. pre-torsion, which was attributed to the texture weakening. The studying provided a promising and cost-effective method to enhance yield strength and reduce tension-compression yield asymmetry while also keep ductility for extruded Mg alloys.

Keyword :

Extruded Mg alloys Extruded Mg alloys Gradient structures Gradient structures Pre -torsion deformation Pre -torsion deformation Tension -compression yield asymmetry Tension -compression yield asymmetry

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GB/T 7714 Xiao, Lei , Yang, Guangyu , Wang, Chen et al. Formation of gradient microstructure and elimination of tension-compression yield asymmetry of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy via free-end torsion [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2023 , 883 .
MLA Xiao, Lei et al. "Formation of gradient microstructure and elimination of tension-compression yield asymmetry of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy via free-end torsion" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 883 (2023) .
APA Xiao, Lei , Yang, Guangyu , Wang, Chen , Chen, Junfeng , Jie, Wanqi . Formation of gradient microstructure and elimination of tension-compression yield asymmetry of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy via free-end torsion . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2023 , 883 .
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Effect of annealing treatment on texture evolution, microstructure and mechanical properties of an extruded Mg-Gd-Zn-Zr alloy SCIE
期刊论文 | 2023 , 27 , 4356-4365 | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
WoS CC Cited Count: 3
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Texture evolution, microstructure and mechanical properties of an extruded Mg-10Gd-1Zn-0.4Zr alloy during annealing were investigated. A bimodal microstructure containing coarse deformed grains and fine dynamically recrystallized grains is observed when the annealing temperature is lower than 200 degrees C. Many Mg-5(Gd, Zn) phases are formed in the alloy annealed at 200 degrees C. Further upon increasing the annealing temperature, static recrystallization occurs and lamellar LPSO phase forms within the matrix. When the annealing temperature reaches 500vC, an obvious grain growth is observed, and Zn2Zr3 phases form. Meanwhile, the dominant texture component transforms from the basal texture (< 10<(1)over bar>0 > parallel to extrusion direction) to an abnormal texture (<0001> parallel to extrusion direction), which is attributed to the growth preference of the grains with abnormal texture. The alloy annealed at 200 degrees C possesses the optimal mechanical properties with the yield strength of 320 MPa, the ultimate strength of 368 MPa and elongation of 18.4 %. The contribution of each strengthening mechanism to the yield strength in annealed alloys is calculated quantitatively. Compared to the as-extruded alloy, the increment of the yield strength in the alloy annealed at 200 degrees C is mainly due to the increase in secondary phase strengthening, while the decrement of the yield strength in the alloy annealed at 500 degrees C is attributed to the reduction of grain boundary strengthening. This work sheds light on adjusting the texture and mechanical properties of the extruded Mg alloys via annealing treatment.

Keyword :

Annealing Annealing Extruded Mg-Gd-Zn-Zr alloy Extruded Mg-Gd-Zn-Zr alloy Mechanical properties Mechanical properties Microstructure Microstructure Texture evolution Texture evolution

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GB/T 7714 Wang, Nan , Xiao, Lei , Luo, Shifeng et al. Effect of annealing treatment on texture evolution, microstructure and mechanical properties of an extruded Mg-Gd-Zn-Zr alloy [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2023 , 27 : 4356-4365 .
MLA Wang, Nan et al. "Effect of annealing treatment on texture evolution, microstructure and mechanical properties of an extruded Mg-Gd-Zn-Zr alloy" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 27 (2023) : 4356-4365 .
APA Wang, Nan , Xiao, Lei , Luo, Shifeng , Yang, Guangyu , Wang, Yan , Fang, Xiaogang et al. Effect of annealing treatment on texture evolution, microstructure and mechanical properties of an extruded Mg-Gd-Zn-Zr alloy . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2023 , 27 , 4356-4365 .
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A Novel Precipitation-Strengthened Conductive Copper Alloy: Cu-Hf-Si Alloy SCIE
期刊论文 | 2023 , 25 (21) | ADVANCED ENGINEERING MATERIALS
WoS CC Cited Count: 1
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The Cu-1.1 wt% Hf-0.1 wt% Si alloy containing various precipitates is studied as a novel precipitation-strengthened alloy with high strength and high electrical conductivity. The Cu-Hf-Si alloy prepared by solution, cold rolling, and aging processes exhibits a hardness of 238.92 HV, a tensile strength of 691.01 MPa, a breaking elongation of 15.09%, and an electrical conductivity of 62.34% International Annealed Copper Standard. The optimal peak aging parameter for Cu-Hf-Si alloy is 430 & DEG;C for 90 min. The precipitation of Hf and Si atoms from the Cu matrix is helpful to enhance the electrical conductivity. The precipitation of Hf can produce fibrous Guinier Preston zone and & gamma;' precipitate, as well as spherical Cu10Hf7 phases. In addition, the coprecipitation of Si and Hf can also produce Hf3(Cu2Si)2 and HfCuSi phases. The high strength of Cu-Hf-Si alloy is mainly due to the multiprecipitates synergistic strengthening. A novel precipitation-strengthened Cu-1.1 wt% Hf-0.1 wt% Si alloy with high strength and high electrical conductivity is prepared by solution, cold-rolling, and aging processes. The precipitation of Hf and Si atoms from the matrix is helpful to enhance the electrical conductivity. The high strength of Cu-Hf-Si alloy is mainly due to the multiprecipitates synergistic strengthening.image & COPY; 2023 WILEY-VCH GmbH

Keyword :

aging aging Cu-Hf-Si alloys Cu-Hf-Si alloys electrical conductivity electrical conductivity mechanical properties mechanical properties precipitates precipitates

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GB/T 7714 Shi, Bingbing , Hong, Du , Wang, Wenweijiao et al. A Novel Precipitation-Strengthened Conductive Copper Alloy: Cu-Hf-Si Alloy [J]. | ADVANCED ENGINEERING MATERIALS , 2023 , 25 (21) .
MLA Shi, Bingbing et al. "A Novel Precipitation-Strengthened Conductive Copper Alloy: Cu-Hf-Si Alloy" . | ADVANCED ENGINEERING MATERIALS 25 . 21 (2023) .
APA Shi, Bingbing , Hong, Du , Wang, Wenweijiao , Su, Longshui , Wang, Chen , Xiao, Lei et al. A Novel Precipitation-Strengthened Conductive Copper Alloy: Cu-Hf-Si Alloy . | ADVANCED ENGINEERING MATERIALS , 2023 , 25 (21) .
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Strengthening 5A02 Al alloy via gradient structures processed by severe torsional deformation SCIE
期刊论文 | 2023 , 36 | MATERIALS TODAY COMMUNICATIONS
WoS CC Cited Count: 1
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5A02 Al alloys with gradient structures were designed by controlling the number of torsional revolutions of 1, 2, 4, and 8. The results showed that the yield strength increased and the uniform elongation decreased with the increasing torsional revolution. Preferable comprehensive properties with yield strength of 196.7 & PLUSMN; 3.7 MPa and uniform elongation of 1.9 & PLUSMN; 0.2 % were obtained at the torsional revolution of 4. It is revealed that the increment in yield strength contributed by HDI stress, grain refinement and the introduction of dislocations, in which dislocation strengthening played the major role. The ductility came from HDI hardening and the strain hardening ability of the center region with low dislocation density. The finding provided a promising and cost-effective method to enhance mechanical properties of Al alloys by tailoring gradient structures.

Keyword :

Aluminum alloy Aluminum alloy Gradient structures Gradient structures Strengthening mechanism Strengthening mechanism Yield strength Yield strength

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GB/T 7714 Ye, Xingke , Su, Wenze , Chen, Yasu et al. Strengthening 5A02 Al alloy via gradient structures processed by severe torsional deformation [J]. | MATERIALS TODAY COMMUNICATIONS , 2023 , 36 .
MLA Ye, Xingke et al. "Strengthening 5A02 Al alloy via gradient structures processed by severe torsional deformation" . | MATERIALS TODAY COMMUNICATIONS 36 (2023) .
APA Ye, Xingke , Su, Wenze , Chen, Yasu , Cheng, Hongxia , Xiao, Lei . Strengthening 5A02 Al alloy via gradient structures processed by severe torsional deformation . | MATERIALS TODAY COMMUNICATIONS , 2023 , 36 .
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