期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.10.088
关键词
Mg-Y-Zn alloy; LPSO phase; Microstructure; Texture; Mechanical properties
类别
资金
- National Science & Technology Pillar Program [2012BAE01B04]
- Chinese Academy of Sciences of Western Action Plan Project [KZCX2-XB3-06]
- National Natural Science Foundation of China Major Project [91122030]
- '863'-National High Technology Research and Development Program of China [2011AA03A407]
- National Natural Science Foundation for Creative Research Group [20921002]
The effect of long period stacking ordered (LPSO) phase on the microstructure, texture and mechanical properties of extruded Mg-Y-Zn alloys with compositions of Mg98.5Y1Zn0.5, Mg95.5Y3Zn1.5 and Mg92.5Y5Zn2.5 (at%), was systematically investigated. The LPSO phases were aligned along the extrusion direction (ED) in the as-extruded Mg-Y-Zn alloys, and significantly enhanced the dynamic recrystallization (DRX) process during the hot extrusion. With the increase of LPSO phase, the degree of DRX process of Mg alloy was more completed, the growth of the DRXed grains resulted in the grain coarsening, and the following phenomena were also observed that the conventional basal fiber texture was remarkably weakened, a novel texture component of <0 0 0 1>//ED appeared in the Mg alloys with higher volume fraction of LPSO phase. The microhardness and tensile yield stress (TYS) of Mg-Y-Zn alloy was improved by LPSO phase, but the ductility was degraded. The strengthening effect of LPSO phase was dominant over that from the grain refinement and texture. (c) 2012 Elsevier B.V. All rights reserved.
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