Mechanical properties and microstructure of AZ31B magnesium alloy processed by I-ECAP

Michal Zbigniew Gzyl, Andrzej Rosochowski, Raphael Pesci, Lech Olejnik, Evgenia Yakushina, Paul Wood

Research output: Contribution to journalArticle

23 Citations (Scopus)
117 Downloads (Pure)

Abstract

Incremental equal channel angular pressing (I-ECAP) is a severe plastic deformation process used to refine grain size of metals, which allows processing very long billets. As described in the current article, an AZ31B magnesium alloy was processed for the first time by three different routes of I-ECAP, namely, A, Bc, and C, at 523 K (250 °C). The structure of the material was homogenized and refined to ~5 microns of the average grain size, irrespective of the route used. Mechanical properties of the I-ECAPed samples in tension and compression were investigated. Strong influence of the processing route on yield and fracture behavior of the material was established. It was found that texture controls the mechanical properties of AZ31B magnesium alloy subjected to I-ECAP. SEM and OM techniques were used to obtain microstructural images of the I-ECAPed samples subjected to tension and compression. Increased ductility after I-ECAP was attributed to twinning suppression and facilitation of slip on basal plane. Shear bands were revealed in the samples processed by I-ECAP and subjected to tension. Tension–compression yield stress asymmetry in the samples tested along extrusion direction was suppressed in the material processed by routes Bc and C. This effect was attributed to textural development and microstructural homogenization. Twinning activities in fine- and coarse-grained samples have also been studied.

Original languageEnglish
Pages (from-to)1609-1620
Number of pages12
JournalMetallurgical and Materials Transactions A
Volume45
Issue number3
Early online date7 Nov 2013
DOIs
Publication statusPublished - 1 Mar 2014

Keywords

  • mechanical properties
  • microstructure
  • az31b
  • magnesium alloy
  • i-ecap

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