Microstructure and thermal stability of nanocrystalline Mg-Gd-Y-Zr alloy processed by high pressure torsion

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

30 Scopus Citations
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Author(s)

  • Lingling Tang
  • Yonghao Zhao
  • R.K. Islamgaliev
  • R.Z. Valiev
  • Y.T. Zhu

Detail(s)

Original languageEnglish
Pages (from-to)577-585
Journal / PublicationJournal of Alloys and Compounds
Volume721
Online published16 May 2017
Publication statusPublished - 15 Oct 2017
Externally publishedYes

Abstract

Fabricating bulk coarse-grain Mg alloys into nanocrystallines (NCs) via severe plastic deformation along with remaining the thermal stability of nanostructures has been a challenging issue. Here we employed high-pressure torsion at room temperature to prepare nanocrystalline (NC) Mg-Gd-Y-Zr alloy with an average grain size of 80 nm. The appearance of NC structures was associated with stacking fault formation, due to the lowering of stacking fault energy by Gd and Y according to the density-functional theory (DFT) calculations. The NC Mg-Gd-Y-Zr alloy showed high thermal stability up to 250 °C, which is comparable with that of its coarse-grained and fine-grained counterpart. This high thermal stability against nanograin growth was caused by stable precipitation at grain boundaries. Therefore, alloying Mg with Gd and Y not only helped with formation of NCs, but also improved the thermal stability.

Research Area(s)

  • Alloying, Density-functional theory calculations, Magnesium, Nanocrystalline, Plastic deformation, Thermal stability

Citation Format(s)