Structure and mechanical and corrosion properties of a magnesium Mg–Y–Nd–Zr alloy after high pressure torsion

E. A. Lukyanova, N. S. Martynenko, V. N. Serebryany, A. N. Belyakov, L. L. Rokhlin, S. V. Dobatkin, Yu Z. Estrin

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

The structure and the properties of an Mg–Y–Nd–Zr alloy (WE43) are studied after high pressure torsion (HPT) in the temperature range 20–300°C. Structure refinement proceeds mainly by deformation twinning with the formation of a partial nanocrystalline structure with a grain size of 30–100 nm inside deformation twins. The WE43 alloy is shown to be aged during heating after HPT due to the decomposition of a magnesium solid solution. HPT at room temperature and subsequent aging causes maximum hardening. It is shown that HPT significantly accelerates the decomposition of a magnesium solid solution. HPT at all temperatures considerably increases the tensile strength and the yield strength upon tensile tests and significantly decreases plasticity. Subsequent aging additionally hardens the WE43 alloy. A potentiodynamic study shows that the corrosion resistance of this alloy after HPT increases. However, subsequent aging degrades the corrosion properties of the alloy.

Original languageEnglish
Pages (from-to)912-921
Number of pages10
JournalRussian Metallurgy (Metally)
Volume2017
Issue number11
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • aging
  • corrosion resistance
  • high pressure torsion
  • Mg–Y–Nd–Zr alloy
  • nanocrystalline structure
  • strength
  • texture
  • twinning

Cite this