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| 1 | Comparisons of microstructure homogeneity,texture and mechanical properties of AZ80 magnesium alloy fabricated by annular channel angular extrusion and backward extrusion显示文摘This paper provided an efficient single pass severe plastic deformation(SPD)method,annular channel angular extrusion(ACAE),for fabricating AZ80 magnesium alloy shell part.The effect of ACAE process on the microstructure homogeneity,texture,and mechanical properties of extruded part was experimentally investigated.For comparison,conventional backward extrusion(BE)was also conducted on processing AZ80 part with same specification.The results showed that ACAE process has a better capacity to refine the microstructure and dramatic improve the deformation homogeneity of the extruded part than BE process.Due to two strong shear deformations were implemented,ACAE process could also concurrently modify the basal texture more notably than BE process.In particular,a bimodal texture was found in ACAE extruded part,which was greatly related to the enhanced synergetic action of basal slip and secondaryslip caused by the effective shear stress.More uniform and superior hardness along the thickness and height of part were achieved via ACAE process.Further surveying of tensile tests also showed that the part fabricated by ACAE process exhibited significantly higher and far more homogeneous tensile properties with an excellent balance of strength and ductility.The remarkable enhanced tensile properties of ACAE extruded part could be primarily attributed to the significant grain refinement,which provided a powerful grain boundary strengthening effect and meaningfully suppressed the development of twin-sized cracks during tensile deformation.It was established that ACAE process seemed to be a very promising single pass SPD method for manufacturing Mg-based alloy shell parts with more homogeneous microstructure and superior performance. | Xi Zhao Shuchang Li Zhimin Zhang Pengcheng Gao Shuailing Kan Fafa Yan | 2020 | Journal of Magnesium and Alloys2020，8，3： | 10 |
| 2 | Controlled preparation and self-assembly of NdVO_4 nanocrystals显示文摘Phase-pure t-NdVO_4 nanocrystals with different shapes have been synthesized by facile and repeatable hydrothermal methods. The as-synthesized t-NdVO_4 nanoparticles were characterized by various techniques of X-ray diffraction(XRD). scanning electron microscope(SEM) and transmission electron microscope(TEM). The growth process and assembly behavior of t-NdVO_4 nanorod arrays were investigated. The results show that the morphology of t-NdV04 nanocrystals is greatly related to the pH value of precursor solution and that strong basic solution is not in favor of the formation of t-NdVO_4 nanoparticles. Due to the strong adhesive action and stabilization of OH^-ions to some crystal faces of NdVO_4, neodymium vanadate crystallite grows into oriented short nanorods and then into nanorod arrays. The shape, crystalline and dimension of NdVO_4 nanocrystals can be effectively governed in our work. | Li Tian Yan Li Huifeng Wang Shanmin Chen Jinjing Wang Zhen Guo Qiang Liu Qi Luo Yingjie Li Fafa Wu | 2018 | Journal of Rare Earths2018，36，2： | 1 |
| 3 | High Strength and Excellent Ductility of AZ80 Magnesium Alloy Cabin Component Developed by W-Shaped Channel Extrusion and Subsequent T6 Heat Treatment显示文摘The AZ80 magnesium(Mg)alloy cabin component with high strength and excellent ductility was developed by W-shaped channel extrusion(WCE)at 350℃ and subsequent T6 heat treatment.The effect of WCE process on the microstructure and mechanical properties of the alloy was experimentally investigated,and the age-hardening behavior with microstructure evolution during heat treatment was revealed.Due to the introduction of multi-stage asymmetric extrusion and severe shear deformation along the annular channel,the average grain size of the WCE extruded alloy could be effectively refined to 4.7μm.Besides,theβphase particles were dynamically precipitated from the fine grain boundaries during extrusion,which hindered the grain growth,but worsen the material plasticity.After T6 treatment,the properties of component were eventually improved to a yield strength(YS)of 218 MPa and ultimate tensile strength(UTS)of 344 MPa with elongation(EL)of 14.5%.It was revealed that the rod/lath-and needle-shaped continuousβphase(CP)with finer size precipitated after T6 treatment was more effective in hindering the movement of dislocations and strengthened the alloy than lamellar discontinuousβphase(DP).The dispersed phase precipitated in the grains,the annihilation of dislocations,the uniformly distributed grains and the re-dissolution ofβphase particles at initial grain boundaries after T6 treatment greatly contributed to the ductility of alloy.Moreover,the T6 treatment also promoted the basal plane of most grains which were re-arranged to the extrusion direction,which promoted the possibility of non-basal slip activation and further improved the elongation of the alloy.As a result,the UTS and YS of the final component increased by 10%and the EL increased by 7%,respectively. | Yuxing Zhang Zhen Wang Shuchang Li Xi Zhao Zhimin Zhang Yaojin Wu Xianwei Ren Fafa Yan Beibei Dong | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，5： | 0 |
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