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学者姓名：肖磊
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Abstract ：
Microstructure,texture,and mechanical properties of the extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy were investigated at different extrusion temperatures(260 and 320℃),extrusion ratios(10∶1,15∶1,and 30∶1),and extrusion speeds(3 and 6 mm/s).The exper-imental results exhibited that the grain sizes after extrusion were much finer than that of the homogenized alloy,and the second phase showed streamline distribution along the extrusion direction(ED).With extrusion temperature increased from 260 to 320℃,the micro-structure,texture,and mechanical properties of alloys changed slightly.The dynamic recrystallization(DRX)degree and grain sizes en-hanced as the extrusion ratio increased from 10∶1 to 30∶1,and the strength gradually decreased but elongation(EL)increased.With the extrusion speed increased from 3 to 6 mm/s,the grain sizes and DRX degree increased significantly,and the samples presented the typic-al<2(-1)(-1)1>-<11(-2)3>rare-earth(RE)textures.The alloy extruded at 260℃ with extrusion ratio of 10:1 and extrusion speed of 3 mm/s showed the tensile yield strength(TYS)of 213 MPa and EL of 30.6％.After quantitatively analyzing the contribution of strength-ening mechanisms,it was found that the grain boundary strengthening and dislocation strengthening played major roles among strength-ening contributions.These results provide some guidelines for enlarging the industrial application of extruded Mg-RE alloy.
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| GB/T 7714 | Chenjin Zhang , Guangyu Yang , Lei Xiao et al. Effects of the extrusion parameters on microstructure,texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy [J]. | 矿物冶金与材料学报 , 2025 , 32 (1) : 136-146 . |
| MLA | Chenjin Zhang et al. "Effects of the extrusion parameters on microstructure,texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy" . | 矿物冶金与材料学报 32 . 1 (2025) : 136-146 . |
| APA | Chenjin Zhang , Guangyu Yang , Lei Xiao , Zhiyong Kan , Jing Guo , Qiang Li et al. Effects of the extrusion parameters on microstructure,texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy . | 矿物冶金与材料学报 , 2025 , 32 (1) , 136-146 . |
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This study successfully developed a dual heterogeneous structure metastable beta titanium alloy via partial recrystallization and low-temperature aging. Compared to omega-phase strengthened homogeneous coarse-grained structures, dual heterogeneous structure demonstrated an exceptional balance between yield strength and ductility. Notably, the Ti-Nb alloy achieved a yield strength surpassing 1 GPa while retaining approximately 5% ductility. The enhancement in yield strength was attributed to multiple strengthening mechanisms, including omega-phase precipitation and hetero-deformation-induced (HDI) strengthening. Moreover, the synergistic effects of HDI hardening and TRIP/ TWIP effects mitigated the embrittling impact caused by the large amount of omega-phase, while also enhancing strain hardening capacity.
Keyword ：
dual heterogeneous structure dual heterogeneous structure HDI HDI isothermal omega-phase isothermal omega-phase Metastable beta titanium alloy Metastable beta titanium alloy TRIP effect TRIP effect
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| GB/T 7714 | Ma, Xinkai , Li, Ningxin , Feng, Tengfeng et al. Overcoming the strength-ductility trade-off in ω-phase strengthened metastable β titanium alloys via dual heterogeneous structure [J]. | MATERIALS RESEARCH LETTERS , 2025 , 13 (8) : 844-853 . |
| MLA | Ma, Xinkai et al. "Overcoming the strength-ductility trade-off in ω-phase strengthened metastable β titanium alloys via dual heterogeneous structure" . | MATERIALS RESEARCH LETTERS 13 . 8 (2025) : 844-853 . |
| APA | Ma, Xinkai , Li, Ningxin , Feng, Tengfeng , Xiao, Lei . Overcoming the strength-ductility trade-off in ω-phase strengthened metastable β titanium alloys via dual heterogeneous structure . | MATERIALS RESEARCH LETTERS , 2025 , 13 (8) , 844-853 . |
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This study investigates the effects of different annealing parameters on the microstructure, texture, and mechanical properties of hot-rolled pure yttrium plates using electron backscatter diffraction for the first time. With the increase of annealing temperature and time, the volume fraction of low-angle grain boundaries of hot-rolled pure yttrium plate decreases. While the intensity of the texture firstly decreases and then increases. During annealing at 600 degrees C, the {0002} pole density shifted from deviating from the normal direction (ND) by similar to 30 degrees to being in line with the ND as the annealing time increased, forming a typical basal texture. This can be attributed to its unique recrystallization mechanism. The strength and hardness of the as-annealed samples were significantly lower than that under the hot-rolled state, while the elongation increased when compared with the hot-rolled sample. The considerable mechanical properties of pure yttrium plate are obtained by hot rolling and following annealing at 600 degrees C for 1 h.
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| GB/T 7714 | Ruan, Wei , Luo, Linguang , Li, Jiajie et al. Effect of annealing parameters on microstructure, texture, and mechanical properties of hot-rolled pure yttrium plate [J]. | JOURNAL OF MATERIALS SCIENCE , 2025 , 60 (14) : 6387-6401 . |
| MLA | Ruan, Wei et al. "Effect of annealing parameters on microstructure, texture, and mechanical properties of hot-rolled pure yttrium plate" . | JOURNAL OF MATERIALS SCIENCE 60 . 14 (2025) : 6387-6401 . |
| APA | Ruan, Wei , Luo, Linguang , Li, Jiajie , Deng, Liping , Wang, Chen , Chen, Junfeng et al. Effect of annealing parameters on microstructure, texture, and mechanical properties of hot-rolled pure yttrium plate . | JOURNAL OF MATERIALS SCIENCE , 2025 , 60 (14) , 6387-6401 . |
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Abstract ：
Microstructure, texture, and mechanical properties of the extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy were investigated at different extrusion temperatures (260 and 320 degrees C), extrusion ratios (10:1, 15:1, and 30:1), and extrusion speeds (3 and 6 mm/s). The experimental results exhibited that the grain sizes after extrusion were much finer than that of the homogenized alloy, and the second phase showed streamline distribution along the extrusion direction (ED). With extrusion temperature increased from 260 to 320 degrees C, the microstructure, texture, and mechanical properties of alloys changed slightly. The dynamic recrystallization (DRX) degree and grain sizes enhanced as the extrusion ratio increased from 10:1 to 30:1, and the strength gradually decreased but elongation (EL) increased. With the extrusion speed increased from 3 to 6 mm/s, the grain sizes and DRX degree increased significantly, and the samples presented the typical <2111>-<1123> rare-earth (RE) textures. The alloy extruded at 260 degrees C with extrusion ratio of 10:1 and extrusion speed of 3 mm/s showed the tensile yield strength (TYS) of 213 MPa and EL of 30.6%. After quantitatively analyzing the contribution of strengthening mechanisms, it was found that the grain boundary strengthening and dislocation strengthening played major roles among strengthening contributions. These results provide some guidelines for enlarging the industrial application of extruded Mg-RE alloy.
Keyword ：
extrusion ratio extrusion ratio extrusion speed extrusion speed extrusion temperature extrusion temperature Mg-rare earth alloys Mg-rare earth alloys strengthening mechanisms strengthening mechanisms
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| GB/T 7714 | Zhang, Chenjin , Yang, Guangyu , Xiao, Lei et al. Effects of the extrusion parameters on microstructure, texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy [J]. | INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS , 2025 , 32 (1) : 136-146 . |
| MLA | Zhang, Chenjin et al. "Effects of the extrusion parameters on microstructure, texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy" . | INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS 32 . 1 (2025) : 136-146 . |
| APA | Zhang, Chenjin , Yang, Guangyu , Xiao, Lei , Kan, Zhiyong , Guo, Jing , Li, Qiang et al. Effects of the extrusion parameters on microstructure, texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy . | INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS , 2025 , 32 (1) , 136-146 . |
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The microstructure of commercially pure titanium subjected to uniaxial compression was meticulously analyzed using electron backscattered diffraction (EBSD) to investigate the variant activation behavior of {11-22} twins and {10-12} twins. The results reveal that the type and number of activated twin variants are strongly dependent on the loading direction-whether applied along the normal direction (ND) or the rolling direction (RD). Notably, loading along ND can activate up to five twin variants, and most are activated with low Schmid Factor (SF) rank but high SF value. The variation in the number of activated twin variants within a grain is influenced by factors such as grain size, the activation stress of twinning versus slip, and the orientation of the loading direction relative to the c-axis. SF value for two twinning systems ({11-22} twins and {10-12} twins) were systematically calculated in pure titanium as a function of the angle between the c-axis and the loading direction, which indicates that compression along a direction closely aligned with the c-axis has the potential to activate up to six variants of {11-22} twins simultaneously. In contrast, compression perpendicular to the c-axis tends to activate fewer {10-12} twin variants, with the twinning activation being highly sensitive to the degree of c-axis rotation.
Keyword ：
EBSD EBSD Multiple-variants Multiple-variants Pure titanium Pure titanium Strain compatibility Strain compatibility Twinning Twinning
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| GB/T 7714 | Chen, Jingxian , An, Qiaojuan , Deng, Liping et al. Activation mechanism of multiple twin variants during uniaxial compression in pure titanium [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1024 . |
| MLA | Chen, Jingxian et al. "Activation mechanism of multiple twin variants during uniaxial compression in pure titanium" . | JOURNAL OF ALLOYS AND COMPOUNDS 1024 (2025) . |
| APA | Chen, Jingxian , An, Qiaojuan , Deng, Liping , Ye, Peng , Wang, Chen , Chen, Junfeng et al. Activation mechanism of multiple twin variants during uniaxial compression in pure titanium . | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1024 . |
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Abstract ：
Mg-1.2Y-1.2Ni (at.%) alloy was extruded at 400 degrees C with an extrusion ratio of 16:1 and different rates from 1 to 6 mm/s. The effect of extrusion rate on microstructure and mechanical properties of the Mg-1.2Y-1.2Ni alloy was systematically investigated. With the increase of extrusion rate, the average recrystallized grain size of Mg-1.2Y-1.2Ni alloy and mean particle diameter of Mg2Ni phase were increased, while the density of geometrically necessary dislocation and the intensity of the basal texture were decreased. When extrusion rate increases from 1 to 6 mm/s, the tensile yield strength (TYS) of as-extruded Mg-1.2Y-1.2Ni alloy decreases from 501 to 281 MPa, while the elongation to failure increases from 1.5% to 6.2%. The Mg-1.2Y-1.2Ni alloy extruded at 3 mm/s obtained TYS of 421 MPa, the ultimate tensile strength (UTS) of 440 MPa and elongation to failure of 2.6%, respectively, exhibiting comprehensive mechanical properties with relatively good plasticity and ultrahigh strength. The ultrahigh TYS of 501 and 421 MPa was mainly due to the strengthening from ultrafine recrystallized grains, high volume fraction long period stacking ordered (LPSO) phases and high density dislocations.
Keyword ：
Extrusion rate Extrusion rate Microstructure Microstructure Ultrahigh strength Ultrahigh strength Wrought Mg-Y-Ni alloy Wrought Mg-Y-Ni alloy
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| GB/T 7714 | Liu, Xiaoqing , Zhang, Xianke , Gao, Jinwei et al. Achieving Ultrahigh Strength in Mg-1.2Y-1.2Ni (at.%) Alloy via Tailoring Extrusion Rate [J]. | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2025 , 38 (2) : 299-312 . |
| MLA | Liu, Xiaoqing et al. "Achieving Ultrahigh Strength in Mg-1.2Y-1.2Ni (at.%) Alloy via Tailoring Extrusion Rate" . | ACTA METALLURGICA SINICA-ENGLISH LETTERS 38 . 2 (2025) : 299-312 . |
| APA | Liu, Xiaoqing , Zhang, Xianke , Gao, Jinwei , Zhu, Xiurong , Xiao, Lei , Yang, Zhengchi et al. Achieving Ultrahigh Strength in Mg-1.2Y-1.2Ni (at.%) Alloy via Tailoring Extrusion Rate . | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2025 , 38 (2) , 299-312 . |
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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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In this work, efficient grain boundary diffusion (GBD) of Tb can be achieved in fine-grained sintered Nd-Fe-B magnet through the addition of Zr. The magnets were prepared using Nd-Fe-B powder with an average particle size of 2.6 mu m. Compared with the magnet without Zr addition, the intrinsic coercivity of the Zr-added magnet increases by 3.55 kOe after GBD with the increment of 15.0 %, and the squareness of the demagnetization curve is improved by 5.7 %. The Zr element can combine with the C element in the magnet to form block-like ZrC precipitates, which inhibits the formation of harmful rare-earth carbon phase and reduces the ineffective depletion of rare earth elements. In addition, the Zr element can also combine with the B element to form needle-like ZrB2 precipitates. The consumption of B element increases the volume fraction of RE-rich phase, thus providing more liquid-phase channels for the diffusion of Tb. The ZrC and ZrB2 precipitates distributed at the grain boundary (GB) can broaden the width of the GB phase, which not only provide broader channels for Tb diffusion, but also improve the magnetic isolation of the main phase grains. By the addition of Zr, the diffusion depth of Tb in the magnet is increased. Meanwhile, the accumulation of Tb on the diffusion surface of the magnet reduces significantly, and the thin and uniform Tb-rich shell is formed on the exterior of the main phase grains in the magnet.
Keyword ：
Fine-grain Fine-grain Grain boundary diffusion Grain boundary diffusion Intrinsic coercivity Intrinsic coercivity Nd-Fe-B magnets Nd-Fe-B magnets Zr addition Zr addition
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| GB/T 7714 | Su, Wenze , Lu, Jiahao , Xiao, Lei et al. Improving Tb diffusion and magnetic properties in fine-grained NdFeB magnet by Zr addition [J]. | MATERIALS CHARACTERIZATION , 2025 , 224 . |
| MLA | Su, Wenze et al. "Improving Tb diffusion and magnetic properties in fine-grained NdFeB magnet by Zr addition" . | MATERIALS CHARACTERIZATION 224 (2025) . |
| APA | Su, Wenze , Lu, Jiahao , Xiao, Lei , Fu, Gang , Shi, Dawei , Wang, Chen et al. Improving Tb diffusion and magnetic properties in fine-grained NdFeB magnet by Zr addition . | MATERIALS CHARACTERIZATION , 2025 , 224 . |
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This study prepared three different microstructures of NiTiFe shape memory alloys (SMAs) through cold rolling and recrystallization annealing. Among them, the heterostructure (HS) type alloy achieved a synergistic combination of strength and ductility while improving its superelastic stability. The ultimate tensile strength of the HS type alloy was 912 MPa, with a uniform elongation of 21.78 %. The residual strain after a single tensile cycle at 7 % strain was 2.66 %, and after ten tensile cycles, the residual strain was 2.69 %. The initial morphology and post-stretching deformation of the NiTiFe SMAs were captured using electron backscatter diffraction (EBSD), revealing the distribution of grain size, high-angle grain boundaries, subgrain boundaries, kernel average misorientation (KAM), and geometrically necessary dislocation (GND) density for all three microstructures. Based on the <111 >/, <100 >/{110}, and <100 >/{010} slip systems, the maximum Schmid factor for each grain slip system in NiTiFe SMAs was obtained. The HS type NiTiFe exhibited superior overall performance due to the synergistic effect of its unique recrystallized grains and non-recrystallized regions. This study provides valuable insights into improving the comprehensive performance of NiTiFe SMAs, which can be applied in a wide range of engineering applications.
Keyword ：
Heterogeneous structures Heterogeneous structures Mechanical properties Mechanical properties Microstructure Microstructure Shape memory alloys Shape memory alloys Superelasticity Superelasticity
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| GB/T 7714 | Zhang, Peiqian , Li, Ningxin , Feng, Tengfeng et al. Improving the mechanical properties and superelasticity of NiTiFe shape memory alloys through heterogeneous structures [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2025 , 932 . |
| MLA | Zhang, Peiqian et al. "Improving the mechanical properties and superelasticity of NiTiFe shape memory alloys through heterogeneous structures" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 932 (2025) . |
| APA | Zhang, Peiqian , Li, Ningxin , Feng, Tengfeng , Luo, Zhengyang , Xiao, Lei , Ma, Xinkai . Improving the mechanical properties and superelasticity of NiTiFe shape memory alloys through heterogeneous structures . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2025 , 932 . |
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High-temperature tensile tests and electron backscatter diffraction analysis are employed to investigate the hot deformation behavior and microstructural evolution of Ti60 titanium alloy under 940-1000 degrees C and strain rates of 5 x10-4 s-1 x 10-2/s. First, a record-breaking superplastic elongation of 337% is achieved under 940 degrees C and 5 x 10-4/s. Second, microstructural analysis reveals temperature/strain-rate dependencies in recrystallization mechanisms: continuous dynamic recrystallization (CDRX) dominates at lower strain rates/higher temperatures, while discontinuous dynamic recrystallization (DDRX) becomes prevalent under opposing conditions. Low-angle grain boundaries (2 degrees-15 degrees) progressively transform into high-angle boundaries (HAGBs) through CDRX, promoting equiaxed grain formation. Superplastic deformation primarily involves CDRX facilitated by intragranular dislocation motion and moderate grain boundary slip, enhancing HAGB development. Critical experimental advances include flow curves exhibited peak stress followed by softening and stabilization, with maximum superplastic elongation reaching 337% at optimal conditions (940 degrees C, 5 x 10-4/s). A constitutive model and processing map are established, identifying favorable deformation parameters as 940-960 degrees C and 0.0005-0.001 s-1 strain rates, corresponding to peak strain-rate sensitivity (m) and energy dissipation efficiency (eta). These findings establish processing-structure-property relationships for optimizing Ti60 alloy forming processes.
Keyword ：
deformation mechanisms deformation mechanisms dynamic recrystallization dynamic recrystallization high-temperature titanium alloys high-temperature titanium alloys superplastic forming superplastic forming
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| GB/T 7714 | Li, Ningxin , Li, Zhuo , Zhang, Peiqian et al. Superplastic Properties and Deformation Mechanisms of Ti60 Titanium Alloy under Coupled Temperature and Strain Rate Conditions [J]. | ADVANCED ENGINEERING MATERIALS , 2025 , 27 (17) . |
| MLA | Li, Ningxin et al. "Superplastic Properties and Deformation Mechanisms of Ti60 Titanium Alloy under Coupled Temperature and Strain Rate Conditions" . | ADVANCED ENGINEERING MATERIALS 27 . 17 (2025) . |
| APA | Li, Ningxin , Li, Zhuo , Zhang, Peiqian , Xiao, Lei , Feng, Tengfeng , Luo, Zhengyang et al. Superplastic Properties and Deformation Mechanisms of Ti60 Titanium Alloy under Coupled Temperature and Strain Rate Conditions . | ADVANCED ENGINEERING MATERIALS , 2025 , 27 (17) . |
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