Twinnability of Al-Mg alloys:A first-principles interpretation

作     者：Dong-dong ZHAO Yan-jun LI 赵冬冬;Ole Martin L?VVIK;Knut MARTHINSEN;李彦军

作者机构：Department of Materials Science and EngineeringNorwegian University of Science and Technology (NTNU) SINTEF Materials and Chemistry 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2017年第27卷第6期

页      面：1313-1318页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project(222173) supported by the FRINATEK project ‘BENTMAT’ from the Research Council of Norway 

主　　题：generalized planar fault energy intrinsic stacking fault energy Suzuki segregation Mg vacancy Al-Mg alloys 

摘      要：Al-Mg alloys are considered to have potentials to form twins during deformation because Mg can reduce the intrinsicstacking fault energy?ISFE of ***,twinning has rarely been found in Al-Mg alloys even subjected to various severeplastic deformation(SPD)*** order to probe the twinning propensity of Al-Mg alloys,first-principles calculations werecarried out to investigate the effects of Mg and vacancies on the generalized planar fault energy(GPFE)of *** is found that bothMg and vacancies exhibit a Suzuki segregation feature to the stacking fault,and have the influence of decreasing the?ISFE of ***,?ISFE does not decrease and the twinnability parameterτa of Al does not increase monotonically with increasing Mgconcentration in the *** the basis ofτa evaluated from the calculated GPFE of Al-Mg alloys,we conclude that deformationtwinning is difficult for Al-Mg alloys even with a high content of ***,the decrease of?ISFE caused by the introduction ofMg and vacancies is supposed to have the effect of improving the work-hardening rate and facilitating the formation of bandstructures in Al-Mg alloys subjected to SPD.