Evolution of microstructure and hardness in AZ31 alloy processed by high pressure torsion

Jitka Stráská, Miloš Janeček, Jeno Gubicza, Tomáš Krajňák, Eun Yoo Yoon, Hyoung Seop Kim

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

A commercial MgAlZn alloy (AZ31) was processed by high pressure torsion (HPT) at room temperature, resulting in an extreme microstructure refinement down to the grain size of 150-250. nm. The microstructure evolution during HPT was investigated by transmission electron microscopy and X-ray diffraction line profile analysis. The microhardness was measured as a function of the distance from the center of the disk and the number of HPT revolutions. The detailed analysis of dislocation contrast factors in X-ray diffraction line profiles enables to determine the population of the different slip systems as a function of the imposed strain. The influence of microstructure and defect structure evolution on microhardness is discussed in detail.

Original languageEnglish
Pages (from-to)98-106
Number of pages9
JournalMaterials Science and Engineering A
Volume625
DOIs
Publication statusPublished - Feb 1 2015

Keywords

  • Dislocations
  • Grain refinement
  • Hardness
  • High pressure torsion
  • Magnesium alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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