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Comparisons of microstructure homogeneity,texture and mechanical properties of AZ80 magnesium alloy fabricated by annular channel angular extrusion and backward extrusion

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Journal of Magnesium and Alloys 2020年第3期8卷 624-639页

作者： Xi Zhao Shuchang Li Zhimin Zhang Pengcheng Gao Shuailing Kan Fafa Yan School of Mechanical and Electrical Engineering North University of ChinaTaiyuan 030051China Engineering Technology Research Center for Integrated Precision Forming of Shanxi Province North University of ChinaTaiyuan 030051China China Aerodynamics Research and Development Center Mianyang 621000China The People's Liberation Army NO.5702 Xianyang 712000China Ningbo Branch of Chinese Academy of Ordnance Science Ningbo 315103China

This paper provided an efficient single pass severe plastic deformation(SPD)method,annular channel angular extrusion(ACAE),for fabricating AZ80 magnesium alloy shell *** effect of ACAE process on the microstructure homogeneity,texture,and mechanical properties of extruded part was experimentally *** comparison,conventional backward extrusion(BE)was also conducted on processing AZ80 part with same *** 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 *** to two strong shear deformations were implemented,ACAE process could also concurrently modify the basal texture more notably than BE *** 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 *** uniform and superior hardness along the thickness and height of part were achieved via ACAE *** 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 *** 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 *** 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.

关键词： Magnesium alloy annular channel angular extrusion Microstructure Texture Mechanical properties

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Infl uence of Heat Treatment on Precipitation Behavior and Mechanical Properties of Extruded AZ80 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 54-64页

作者： Xi Zhao Fa-Fa Yan Zhi-Min Zhang Peng-Cheng Gao Shu-Chang Li School of Mechanical and Electrical Engineering North University of ChinaTaiyuan 030051China Ningbo Branch of Chinese Academy of Ordnance Science Ningbo 315103China Engineering Technology Research Center for Integrated Precision Forming of Shanxi Province Taiyuan 030051China China Aerodynamics Research and Development Center Mianyang 621000China

By means of annular channel angular extrusion technology and solution treatment,the AZ80 supersaturated solid solu-tion was ***β-Mg 17 Al 12 precipitate morphologies analysis along with its sizes and area fraction measurement was performed to investigate mechanical properties variation of alloy at various aging *** results indicated that after solution treatment,the intergranular precipitate of as-extruded alloy was re-dissolved into the matrix,eff ectively decreasing the stress concentration,which was benefi cial to the enhancement of *** aging temperatures of 300°C,Widmanstatten structure,lath-shaped precipitate,and intergranular precipitate were observed,while at 175–200°C,cellular structure and oval-shaped particle were also identifi *** morphology,area fraction,size of the precipitates,and PFZs(precipitate free zones)width worked together to aff ect the age-hardening behavior of the *** strength and hardness of the peak-aged samples decreased with the increase in aging temperature,which is primarily attributed to the reduction in cellular structure area fraction and the corresponding increase in the interlamellar spacing,and the coarsening of the rhombus precipitate.

关键词： AZ80 mg alloy annular channel angular extrusion Heat treatment Precipitate Mechanical properties

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