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

Journal article


Gzyl, Michal, Rosochowski, Andrzej, Pesci, Raphael, Olejnik, Lech, Yakushina, Evgenia and Wood, Paul 2013. Mechanical properties and microstructure of AZ31B magnesium alloy processed by I-ECAP. Metallurgical and Materials Transactions A. https://doi.org/10.1007/s11661-013-2094-z
AuthorsGzyl, Michal, Rosochowski, Andrzej, Pesci, Raphael, Olejnik, Lech, Yakushina, Evgenia and Wood, Paul
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 coarsegrained samples have also been studied.

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 coarsegrained
samples have also been studied.

KeywordsMagnesium alloy; Shear band; Basal plane; Equal channel angular pressing; Basal slip
Year2013
JournalMetallurgical and Materials Transactions A
PublisherSpringer
ISSN10735623
15431940
Digital Object Identifier (DOI)https://doi.org/10.1007/s11661-013-2094-z
Web address (URL)http://hdl.handle.net/10545/622167
http://creativecommons.org/licenses/by/4.0/
hdl:10545/622167
Publication dates07 Nov 2013
Publication process dates
Deposited19 Feb 2018, 11:02
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ContributorsUniversity of Strathclyde, ENSAM-Arts et Métiers ParisTech and Warsaw University of Technology
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