Strengthening effect of prefabrication(10-12)tensile twinning on AZ80+0.4%Ce magnesium alloy and inhibition mechanism of discontinuous precipitation  

作　　者：Zhen Wang Xi Zhao Zhimin Zhang Yaojin Wu Kai Chen Xianwei Ren Dengkui Wang Wei Wang 

机构地区：[1]School of Mechanical and Electrical Engineering,North University of China,Taiyuan 030051,China [2]Engineering Technology Research Center for Integrated Precision Forming of Shanxi Province,North University of China,Taiyuan 030051,China

出　　处：《Journal of Magnesium and Alloys》2024年第5期1918-1930,共13页镁合金学报（英文）

基　　金：the financial supports from Program for the Supported by the Innovative Talents Support Program of Higher Education Institutions in Shanxi Province;the‘Shanxi Province’s Key Core Technology and Common Technology Research And Development Special Project’(2020XXX015);Special Project for Scientific and Technological Cooperation and Exchange in Shanxi Province(regional cooperation project):Key Technologies for flexible manufacturing of high-strength heat-resistant magnesium alloy cabin components(202104041101033)。

摘　　要：This paper provided an effective method to further improve the mechanical properties of the AZ80+0.4%Ce magnesium alloy wheel spoke.The effect of high strength and ductility was obtained with a yield strength of 295.36 MPa,an elongation of 10%,by the combination of pre-deformation(7%deformation)and two-stage aging treatment(120℃/9 h+175℃/24 h).The evolution of the microstructure and properties of the alloy was explored under the coupling conditions of different pre-deformation degrees and multi-stage aging.The results show that,pre-deformation introduced a large number of(1012)tensile twinning and dislocations,which greatly promoted the probability of continuous precipitates(CPs)appearing.On the contrary,the discontinuous precipitates(DPs)were limited by the vertical and horizontal twin structure.As a result,the pre-nucleation method of two-stage aging increased the proportion of CPs by 34%-38%.Owing to the DPs was effectively suppressed,the alloy's yield strength has been greatly improved.Besides,under multi-stage aging,the twin boundaries induce protruding nucleation to form static recrystallization by hindering the migration of dislocations,and the matrix swallows the twins,then the texture gradually tilts from the two poles to the basal plane.As an important supplement,the grain refinement and oblique texture promoted the improvement of the yield strength of the component.

关 键 词：Magnesium alloy Pre-deformed Two-stage aging Tensile twinning Continuous precipitates Texture 

分 类 号：TG146.22[一般工业技术—材料科学与工程]