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: 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.