Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 14    No. 3    June 2004

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Effect of heat treatment on eutectic silicon morphology and
mechanical property of Al-Si-Cu-Mg cast alloys
LI Run-xia(李润霞)1, 2, LI Rong-de(李荣德)2, ZHAO Yu-hua(赵玉华)1,
LI Chen-xi(李晨曦)2,
SUN Xiao-feng(孙晓峰)3, GUAN Heng-rong(管

1. Department of Material Engineering,
Shenyang Institute of Aeronautical Engineering, Shenyang 110034, China;
2. School of Materials Science and Engineering,
Shenyang University of Technology, Shenyang 110023, China;
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract:Through morphology observation on silicon particles of Al-Si-Cu-Mg cast alloy, it is found that during solution treatment the evolution of eutectic silicon morphology and their effect on mechanical properties can be classified into three stages. In the initial stage, necking, stubbing and fragmentation of silicon particles result in the improvement of plasticity of alloy. In the intermediate stage, the mechanical properties of 354 alloy attain peak values due to spheroidization of silicon particles. In the final stage, the drop of hardness and strength is related to the deterioration of silicon morphology. The facets and lap occur in silicon particles and the coarsening process of silicon follows LSW model. During aging, the clusters of excess silicon can work as barriers for dislocation movement and thus enhance the strength of alloy. On the oth-
er hand, excess Si affects the process of aging precipitation and leads to a fine and highly dense distribution of GP zones,finally effectively strengthens the alloy.


Key words: Al-Si-Cu-Mg alloy; eutectic silicon; mechanical property; heat treatment; quantitative metallography

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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