Characterisation of the rheological behaviour in the semi-solid state of grain-refined AZ91 magnesium alloys

被引：67
作者：
Gebelin, JC
Suery, M
Favier, D
机构：
[1] Univ Grenoble 1, Inst Natl Polytech Grenoble, CNRS, ESA 5010,ENSPG, F-38402 St Martin Dheres, France
[2] Univ Grenoble 1, CNRS, UMR 5521,Lab Sols Solides Struct 3S, ENSHMG,Inst Natl Polytech Grenoble, F-38041 Grenoble, France
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1999年 / 272卷 / 01期
关键词：
AZ91 magnesium alloys; semi-solid; rheological behaviour; partial remelting; micrustructure; thixocasting;
D O I：
10.1016/S0921-5093(99)00467-0
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The results of an experimental investigation carried out with grain-refined AZ91 magnesium-aluminium alloys are presented. The microstructure of the material during partial remelting and holding in the semi-solid state was thus characterised together with its rheological behaviour. For this purpose, various mechanical tests were performed including simple compression, backward extrusion, tension and filtration. The investigated parameters were the shear rate and the temperature which affects the liquid volume fraction. The tests allow the apparent viscosity of the alloy to be determined as a function of the liquid volume fraction and the shear rate together with the densification behaviour of the solid phase. In addition, a strong difference between compression and tension was observed depending on the solid volume fraction. The rheological data are correlated with the solid volume fraction in the alloy, and comparison with other alloys is carried out. Finally the results justify the development of a two-phase model in which the material is considered as a porous solid medium saturated with liquid. (C) 1999 Elsevier Science S.A. All rights reserved.
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页码：134 / 144
页数：11
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