Activation of dislocations in Mg with solute Y

Maldar, Alireza; Wang, Leyun; Liu, Boyu; Liu, Wenjun; Jin, Zhaohui; Zhou, Bijin; Zeng, Xiaoqin

doi:10.1016/j.jma.2021.11.004

Title: Activation of dislocations in Mg with solute Y

Journal Article · 09 December 2021 · Journal of Magnesium and Alloys

DOI: https://doi.org/10.1016/j.jma.2021.11.004 · OSTI ID:1835179

^[1];

^[2];

^[3]; Jin, Zhaohui ^[4]; Zhou, Bijin ^[5]; Zeng, Xiaoqin ^[1]

Shanghai Jiao Tong University (China)
Xi'an Jiaotong University (China)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Chinese Academy of Sciences, Shenyang (China)
Shanghai Jiao Tong University (China); Suzhou University of Science and Technology, Suzhou (China)

Mg-Y cast alloy shows excellent ductility (elongation to failure > 15%) compared with pure Mg and commercial Mg cast alloys. By monitoring the microstructure evolution during an in situ tensile test of a Mg-2.5 wt%Y alloy, we identify the activation of prismatic slip, which is rare in Mg. Synchrotron X-ray micro-beam Laue diffraction (μ-Laue) and transmission electron microscopy revealed the morphology of prismatic slip bands and individual dislocations. Density functional theory and molecular dynamics calculations indicate that solute Y can significantly reduce the stacking fault energy (SFE) along direction on prismatic plane in Mg lattice and thus facilitate the nucleation of dislocations during deformation. The presence of free dislocations in the Mg lattice can also lead to nucleation of {10–12} twins even under unfavorable geometric conditions.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1835179

Journal Information:: Journal of Magnesium and Alloys, Journal Name: Journal of Magnesium and Alloys Journal Issue: 3 Vol. 12; ISSN 2213-9567

Publisher:: National Engineering Research Center for Magnesium Alloys of ChinaCopyright Statement

Country of Publication:: United States

Language:: English

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