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Solute atom segregation to I1 stacking fault and its bounding partial dislocations in a Mg–Bi alloy

Journal of Magnesium and Alloys 2024年第8期12卷 3135-3141页

作者： Cong He Yong Zhang Zhiqiao Li Houwen Chen Jian-Feng Nie International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing 400044PR China Research Center for Magnetic and Spintronic Materials National Institute for Materials ScienceTsukuba 305-0047Japan Department of Materials Science and Engineering Monash UniversityVictoria 3800Australia State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082PR China

Stacking faults(SFs)and the interaction between solute atoms and SFs in a Mg–Bi alloy are investigated using aberration-corrected scanning transmission electron *** is found that abundant I_(1)SFs are generated after cold rolling and are mainly distributed inside{1012}*** aging treatment,the formation of single-layer and three-layer Bi atom segregation in the vicinity of I_(1)fault are clearly *** segregation also occurs at the 1/6bounding Frank partial dislocation *** segregation behaviors in I_(1)fault and Frank dislocations are discussed and rationalized using first-principles calculations.

关键词： Mg alloys suzuki segregation Stacking fault Frank partial dislocation

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

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Transactions of Nonferrous Metals Society of China 2017年第6期27卷 1313-1318页

作者： Dong-dong ZHAO Yan-jun LI Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU) SINTEF Materials and Chemistry

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.

关键词： generalized planar fault energy intrinsic stacking fault energy suzuki segregation Mg vacancy Al-Mg alloys

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