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

被引：6

作者：

Zhao, Dong-dong ^{[1
]}

Lovvik, Ole Martin ^{[2
]}

Marthinsen, Knut ^{[1
]}

Li, Yan-jun ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol NTNU, Dept Mat Sci & Engn, N-7491 Trondheim, Norway

[2] SINTEF Mat & Chem, N-0314 Oslo, Norway

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2017年 / 27卷 / 06期

关键词：

generalized planar fault energy; intrinsic stacking fault energy; Suzuki segregation; Mg; vacancy; Al-Mg alloys; TOTAL-ENERGY CALCULATIONS; PLANAR FAULT ENERGY;

D O I：

10.1016/S1003-6326(17)60152-3

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Al-Mg alloys are considered to have potentials to form twins during deformation because Mg can reduce the intrinsic stacking fault energy. gamma(ISFE) of Al. Nevertheless, twinning has rarely been found in Al-Mg alloys even subjected to various severe plastic deformation (SPD) techniques. In order to probe the twinning propensity of Al-Mg alloys, first-principles calculations were carried out to investigate the effects of Mg and vacancies on the generalized planar fault energy (GPFE) of Al. It is found that both Mg and vacancies exhibit a Suzuki segregation feature to the stacking fault, and have the influence of decreasing the. gamma(ISFE) of Al. However,. gamma(ISFE) does not decrease and the twinnability parameter tau(a) of Al does not increase monotonically with increasing Mg concentration in the alloy. On the basis of ta evaluated from the calculated GPFE of Al-Mg alloys, we conclude that deformation twinning is difficult for Al-Mg alloys even with a high content of Mg. Besides, the decrease of. gamma(ISFE) caused by the introduction of Mg and vacancies is supposed to have the effect of improving the work-hardening rate and facilitating the formation of band structures in Al-Mg alloys subjected to SPD.

引用

页码：1313 / 1318

页数：6

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