Effect of cryogenic treatment on the microstructure and mechanical properties of Mg-1.5Zn-0.15Gd magnesium alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yong Liu
  • Shuang Shao
  • Chun-shui Xu
  • Xiao-shu Zeng
  • Xiang-jie Yang

Detail(s)

Original languageEnglish
Pages (from-to)76-81
Journal / PublicationMaterials Science and Engineering A
Volume588
Publication statusPublished - 20 Dec 2013
Externally publishedYes

Abstract

The effect of cryogenic treatment on the microstructure and mechanical properties of Mg-1.5Zn-0.15Gd (at%) alloy were investigated. The result showed that numerous W phase particles precipitated from the Mg matrix after cryogenic treatment. With increasing cryogenic treatment duration from 1. min to 24. h, the volume fraction of W phase precipitate also increased, which agreed with the Kolmogorov-Johnson-Mehl-Avrami model. The kinetics of such precipitates was attributed to the additional space coming from the lattice contraction of Mg under cryogenic environment. After cryogenic treatment for 24. h, the ductility of alloy was enhanced by 79%, since the homogenous distributed W phase with nanoscale activated the nucleation of twins during deformation. One formation criterion of precipitation in Mg alloy under cryogenic environment was suggested. Cryogenic treatment could be efficient only for the formation of precipitate with a much lower atom density than the matrix. © 2013 Elsevier B.V.

Research Area(s)

  • Cryogenic treatment, Magnesium alloy, Mechanical properties, Precipitation mechanism, Twinning

Citation Format(s)