Influence of Extrusion on the Microstructure and Mechanical Behavior of Mg-9Li-3Al- x Sr Alloys
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THE demand for lightweight metallic materials is fueled in part by the strategic need to reduce energy consumption while minimizing environmental impact. Under these constraints, Mg emerges as an attractive metal system, given its low density and attractive combination of physical and mechanical attributes. However, most of the commercially available Mg alloys possess an hcp crystalline structure and a high axial ratio (c/a) of 1.6236. Therefore, their capacity for plastic deformation is poor at room temperature, which consequently hinders the application of Mg alloys in many fields.[1,2] Interestingly, Li additions to Mg have been reported to not only decrease their density, but also enhance their ductility. On the one hand, alloying Mg with Li having extremely low density of 0.534 g/cm3 can further reduce the density of Mg alloys. On the other hand, Li additions lead to a YAN YANG, Ph.D. Candidate, is with the College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China, and also with the Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616. XIAODONG PENG and WEIDONG XIE, Professors, are with the College of Materials Science and Engineering, Chongqing University. HAIMING WEN and BAOLONG ZHENG, Postdoctoral Researchers, YIZHANG ZHOU, Assistant Researcher, and ENRIQUE J. LAVERNIA, Professor, are with the Department of Chemical Engineering and Materials Science, University of California. Contact e-mail: [email protected] Manuscript submitted February 2, 2012. Article published online November 7, 2012 METALLURGICAL AND MATERIALS TRANSACTIONS A
reduction of c/a axial ratio of the hcp lattice and even changes the crystalline structure of Mg alloys, which is beneficial in terms of ductility.[3,4] The Li content in Mg alloys is a key factor that influences both microstructure and mechanical response. The Mg-Li phase diagram[5] (as shown in the Appendix) indicates that when Li content is
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