Detwinning and Anneal-Hardening Behaviors of Pre-Twinned AZ31 Alloys under Cryogenic Loading  

作　　者：Lingyu Zhao Wei Zhu Chao Zhang Yunchang Xin Changjian Yan Yao Cheng Zhaoyang Jin 

机构地区：[1]School of Mechanical Engineering,Yangzhou University,Yangzhou,225127,China [2]Key Laboratory for Light-Weight Materials,Nanjing Tech University,Nanjing,210009,China [3]Institute of Corrosion Science and Technology,Guangzhou,510070,Guangdong,China [4]Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing Institute of Technology,Nanjing,211167,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第9期1551-1563,共13页金属学报（英文版）

基　　金：co-supported by the National Natural Science Foundation of China(Nos.51901202 and 52101132);the Young Elite Scientist Sponsorship Program by CAST(YESS20230412);the China Postdoctoral Science Foundation(2022M713366);the Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology(ASMA202206);the Guangdong Basic and Applied Basic Research Foundation(2023A1515010075);the Natural Science Foundation of Jiangsu Province(No.BK 20191442);the Basic and Applied Basic Research Project of Guangzhou(202201011250).

摘　　要：Detwinning behavior of a pre-twinned magnesium alloy AZ31 at cryogenic temperature was investigated,also with a focus on the annealing hardening behavior of samples with different fractions of pre-twins.Pre-compression along the transverse direction with strains of 1.7%,3.0%,and 6.0% was applied to generated[1012]twins.Mechanical behavior,microstructure,and texture evolution during subsequent tension were examined.Our results show that low temperature did not change the fact that detwinning still pre-dominated in the pre-twinned samples under reverse loading.However,a relatively harder migration of twin boundaries was found at cryogenic temperature.An annealing hardening of 27-40 MPa was observed in the pre-twinned samples,and such a hardening effect shows a close relation with the fraction of pre-twins or the level of pre-strains.The annealing hardening effect disappeared if the matrix was consumed by twins along with the increased pre-compression strains.The corresponding reasons for the annealing hardening behavior were discussed.

关 键 词：Mg alloys Detwinning Annealing hardening Cryogenic temperature Mechanical property 

分 类 号：TG13[一般工业技术—材料科学与工程]