Analysis of the creep behaviour of die-cast Mg-3Al-1Si alloy

被引：34
作者：
Zhu, S. M. [1 ,2 ]
Easton, M. A. [1 ]
Gibson, M. A. [3 ]
Dargusch, M. S. [4 ,5 ]
Nie, J. F. [2 ]
机构：
[1] Monash Univ, Dept Mat Engn, CAST Cooperat Res Ctr, Clayton, Vic 3800, Australia
[2] Monash Univ, Dept Mat Engn, ARC Ctr Excellence Design Light Met, Clayton, Vic 3800, Australia
[3] CSIRO Proc Sci & Engn, CAST Cooperat Res Ctr, Clayton, Vic 3169, Australia
[4] Univ Queensland, Sch Mech & Min Engn, Ctr Adv Mat Proc & Mfg, Brisbane, Qld 4075, Australia
[5] Univ Queensland, Def Mat Technol Ctr, Brisbane, Qld 4075, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 578卷
关键词：
Magnesium alloys; Creep; Threshold stress; Power-law breakdown; AS31; HIGH-TEMPERATURE DEFORMATION; MAGNESIUM; AS21;
D O I：
10.1016/j.msea.2013.04.100
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The creep behaviour of die-cast Mg-3Al-1Si (AS31) alloy has been studied at 125 degrees C, 150 degrees C and 175 degrees C with stresses ranging 50-110 MPa. The alloy exhibits anomalously high stress exponents, i.e. 14.4 at 125 degrees C, 11.6 at 150 degrees C and 9.5 at 175 degrees C. Contrary to work reported previously, these high stress exponents cannot be rationalised using the threshold stress approach that is commonly adopted in analysing creep behaviour of dispersion strengthened alloys or metal matrix composites. It is shown that the observed high stress exponents are associated with the dominance of power-law breakdown creep in this study, and the stress dependence can be well described by the Garofalo sinh relationship with the natural exponent of 5. Transmission electron microscopy (TEM) observations reveal that cross-slip of < a > type dislocations is probably the controlling creep mechanism. (C) 2013 Elsevier B.V. All rights reserved.
引用
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页码：377 / 382
页数：6
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