@article{Yang2024, 
author = {Qiang Yang and Shuhui Lv and Zixiang Yan and Zefeng Xie and Xin Qiu},
title = {Exceptional reversed yield strength asymmetry in a rare-earth free Mg alloy containing quasicrystal precipitates},
year = {2024},
journal = {Journal of Magnesium and Alloys},
volume = {12},
number = {2},
pages = {687-699},
keywords = {Magnesium alloy, Reversed yield strength asymmetry, Transmission electron microscopy (TEM), Twinning, Dislocations},
url = {https://www.sciopen.com/article/10.1016/j.jma.2022.10.005},
doi = {10.1016/j.jma.2022.10.005},
abstract = {This work reports an exceptional reversed yield strength asymmetry at room temperature for a rare-earth free magnesium alloy containing a mass of fine dispersed quasicrystal (I-phase) precipitates. Although exhibiting traditional basal texture, it owns an exceptional CYS/TYS as high as ~1.17. Electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM) examinations indicate pyramidal < c + a > and prismatic < c > dislocations plus tensile twinning being activated after immediate yielding in compression while basal and non-basal < a > dislocations in tension. I-phase particles transferred the concentrated stress by self-twinning to provide the driving force for tensile twin initiating in neighboring grains, thereby significantly increasing the critical resolved shear stress of tensile twinning to possibly the level of pyramidal < c + a > slip, finally leading to the dominance of pyramidal < c + a > slip plus tensile twinning in texture grains. This results in a higher contribution on yield strength by ~55 MPa in compression than in tension, which reasonably agrees with the experimental yield strength difference (~38 MPa). It can be concluded that I-phase particles influence deformation modes in tension and in compression, finally result in reversed yield strength asymmetry.}
}