Local lattice distortion mediated formation of stacking faults in Mg alloys

Wang, William Yi; Tang, Bin; Shang, Shun-Li; Wang, Jiangwei; Li, Shilei; Wang, Yi; Zhu, Jian; Wei, Siyuan; Wang, Jun; Darling, Kristopher A.; Mathaudhu, Suveen N.; Wang, Yiguang; Ren, Yang; Hui, Xi Dong; Kecskes, Laszlo J.; Li, Jinshan; Liu, Zi-Kui

doi:10.1016/j.actamat.2019.03.030

Title: Local lattice distortion mediated formation of stacking faults in Mg alloys

Journal Article · Sun Mar 24 00:00:00 EDT 2019 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2019.03.030· OSTI ID:1558626

^[1]; Tang, Bin ^[1];

^[2]; Wang, Jiangwei ^[3];

^[4]; Wang, Yi ^[2]; Zhu, Jian ^[4]; Wei, Siyuan ^[3];

^[1]; Darling, Kristopher A. ^[5]; Mathaudhu, Suveen N. ^[6]; Wang, Yiguang ^[1]; Ren, Yang ^[7]; Hui, Xi Dong ^[4]; Kecskes, Laszlo J. ^[8];

^[1]; Liu, Zi-Kui ^[2]

Northwest Polytechnical Univ., Xían (China)
Pennsylvania State Univ., University Park, PA (United States)
Zhejiang Univ., Hangzhou (China)
Univ. of Science and Technology Beijing, Beijing (China)
Army Research Lab., Aberdeen, MD (United States)
Univ. of California, Riverside, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Johns Hopkins Univ., Baltimore, MD (United States)

Long periodic stacking ordered phases (LPSOs), consisting of various configurations of stacking faults, play an important role in developing ultrastrong Mg alloys with moderate ductility. However, their formation mechanisms are far from clear as no apparent defects are introduced during their formation as it is commonly believed that stacking faults are induced by defects. Here, we present the atomic and electronic basis for lattice-distortion-mediated formation of stacking faults, i.e., localized face-centredcubic (FCC) structures, within a Mg-Zn-Y alloy with a hexagonal close-packed (HCP) structure. The atomic motion trajectories from ab-initio molecular dynamic simulations show that the Mg atoms occupying the nearest neighbour positions of Zn and Y solute atoms undergo a local HCP-to-FCC transition. It is revealed that a local lattice distortion caused by the solute atoms enables the Mg atoms to move and rearrange into a local FCC configuration, which is validated by high resolution scanning transmission microscopy and in-situ synchrotron X-ray diffraction. Our simulations provide profound insight into the formation mechanism of stacking faults in HCP Mg and their physical nature of phase transformations. This is not only critically important because conventional defects, such as dislocations and vacancies, are important to deformation for Mg and its alloys, but also because they serve as a potential new approach to the design of advanced Mg alloys when defects could be used to facilitate

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Laboratory (USARL); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1558626

Journal Information:: Acta Materialia, Vol. 170, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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Title: Local lattice distortion mediated formation of stacking faults in Mg alloys

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