期刊论文详细信息
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 卷:700
Evolution of microstructure and mechanical properties of an as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy processed by high pressure torsion
Article
Sun, W. T.1  Xu, C.2  Qiao, X. G.1  Zheng, M. Y.1  Kamado, S.2  Gao, N.3  Starink, M. J.3 
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Nagaoka Univ Technol, Dept Mech Engn, Nagaoka, Niigata 9402188, Japan
[3] Univ Southampton, Mat Res Grp, Fac Engn & Environm, Southampton SO17 1BJ, Hants, England
关键词: Mg-RE alloy;    High pressure torsion;    Microstructure;    Mechanical properties;   
DOI  :  10.1016/j.msea.2017.05.115
来源: Elsevier
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【 摘 要 】

The novel Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy with high content of rare earth elements has been processed successfully by high pressure torsion (HPT) starting from an as-cast condition, HPT processing was conducted at room temperature for a range of turns from 1/8 to 16, and the evolutions of microstructure and microhardness were investigated. The average grain size decreases from similar to 85 gm in the as-cast condition to similar to 55 nm when the equivalent strain reaches similar to 6.0, and remains almost constant on further strain increase. Meanwhile, the coarse netlike Mg-3(Gd,Y) second phase structures are gradually broken into fine dispersed particles and the dislocation density increases. The microhardness of the alloy increases with increasing strain, and when the equivalent strain reaches similar to 6.0, the microhardness reaches a saturated value of about 115 HV, which is higher than that obtained by conventional extrusion/rolling of this alloy. The full range of possible mechanisms of hardening are analyzed and this reveals that hardening is primarily due to the pronounced grain refinement, which is substantially stronger than that for HPT-processed conventional Mg alloys, and to the homogeneously distributed fine second phase particles and the high dislocation density.

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