Effects of zinc on creep strength and deformation substructures in Mg-Y alloy

被引:135
作者
Suzuki, M [1 ]
Kimura, T
Koike, J
Maruyama, K
机构
[1] Tohoku Univ, Grad Sch Environm Studies, Ecomat Design & Proc Engn Course, Sendai, Miyagi 9808579, Japan
[2] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 387卷
关键词
magnesium-yttrium alloys; creep; dislocation substructure; stacking fault energy; extended dislocation; planar faults;
D O I
10.1016/j.msea.2003.12.071
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Compressive Creep behavior of a hot-rolled Mg-Y binary alloy and Mg-Y-Zn ternary alloys was investigated at 650 K. Creep strength of Mg-Y alloys was significantly improved by the addition of zinc. In Mn-Y-Zn alloys, many "planar faults" were formed on (0 0 0 1) matrix planes at high temperatures even with small addition of 0.02 mol% zinc. The stacking fault energy decreased by the simultaneous addition of yttrium (Y) and zinc and many a-dislocations on basal planes were extended. The separation width of the extended dislocations is stabilized by the segregation of yttrium and zinc and the separation width significantly increases under the interaction of partial dislocations on different basal planes. The excellent creep strength in Mg-Y-Zn was explained by the decrease of the mobility of these widely extended dislocations. (C) 2004 Published by Elsevier B.V..
引用
收藏
页码:706 / 709
页数:4
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