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Microstructure and mechanical properties of extruded Mg-1Ca-1Zn-0.6Zr alloy

TitleMicrostructure and mechanical properties of extruded Mg-1Ca-1Zn-0.6Zr alloy
Publication TypeJournal Article
Year of Publication2016
AuthorsGeng, J, Nie, JF
JournalMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
Volume653
Pagination27-34
Date Published01
Type of ArticleArticle
ISBN Number0921-5093
Accession NumberWOS:000369203600005
Keywordsalloys, az31, ca-zn alloys, deformation, Dynamic recrystallisation, dynamic recrystallization, extrusion, grain-refinement, high-strength, low-temperature, magnesium alloys, mg, Microstructure, Precipitates, texture evolution, wrought magnesium alloy
Abstract

The microstructure and tensile property of extruded Mg-1Ca-1Zn-0.6Zr alloy have been examined by means of electron backscattered diffraction, scanning and transmission electron microscopy. A fine microstructure and a typical basal texture are obtained in the extruded alloy which exhibits a yield strength as high as 306 MPa along with a moderate elongation similar to 11%. The refined as-extruded microstructure is a result of the combination of dynamic recrystallisation and the Zener pinning effect induced by the fine precipitates. Both discontinuous and continuous dynamic recrystallisation are found to be operative in this study. Under tensile stress, cracks nucleate and propagate in the large Mg2Ca(Zn) particles which are formed during the solidification of casting and retained after extrusion. (C) 2015 Elsevier B.V. All rights reserved.

DOI10.1016/j.msea.2015.12.004
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