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Indexed by:Journal Papers

Date of Publication:2019-09-01

Journal:JOURNAL OF MAGNESIUM AND ALLOYS

Included Journals:SCIE

Volume:7

Issue:3

Page Number:456-465

ISSN No.:2213-9567

Key Words:Magnesium alloys; Scandium; Microstructure; Mechanical properties

Abstract:The microstructure and tensile properties of the as-cast and as-rolled Mg-4.5Sn-5Zn alloys by adding various Sc content were investigated. Improvement of the tensile properties in as-cast Sc-containing alloys is attributed to the grain refinement and modification of secondary phase morphology. Three types of precipitates, namely spherical Mg2Sn, rod-like MgZn and Sc-rich phases were dispersed in the matrix of the Sc added Mg-4.5Sn-5Zn alloys after hot rolling deformation. In addition, weakening and deflecting of the basal texture in as-rolled alloys were found and were attributed to Sc addition. Further increasing the Sc addition rate to 0.4wt.%, however, resulted in the clustering of the Sc-rich phases and was found to reduce the tensile properties of the alloy, especially the elongation. The as-rolled Mg-4.5Sn-5Zn-0.3Sc alloy exhibits an optimum combination of tensile properties. The ultimate tensile strength, yield strength and elongation are 293.0 MPa, 164.2Mpa and 21.5%, respectively, and the elongation is about 68% higher than that of Sc-free alloy. (C) 2019 Published by Elsevier B.V. on behalf of Chongqing University.