Effect of trace La addition on the microstructures and mechanical properties of A356 (Al-7Si-0.35Mg) aluminum alloys

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题名:	Effect of trace La addition on the microstructures and mechanical properties of A356 (Al-7Si-0.35Mg) aluminum alloys
作者:	Tsai,YC;Chou,CY;Lee,SL;Lin,CK;Lin,JC;Lim,SW
贡献者:	機械工程研究所
关键词:	AL-SI ALLOYS;EUTECTIC MODIFICATION
日期:	2009
上传时间:	2010-06-29 18:01:44 (UTC+8)
出版者:	中央大學
摘要:	A356 hypoeutectic alloy is a heat-treatable Al-Si-Mg system with a normal composition of Al-7wt.% Si and about 0.35 wt.% Mg which has widespread applications in the aerospace and automotive industries. The purpose of this study is to determine the influence of different amounts of La on the microstructures and mechanical properties of A356 alloys. The microstructures of as-cast samples were examined by using optical microscopy (OM), scanning electron microscopy (SEM) and image analysis. The mechanical properties were investigated by tensile test, and the quality index (Q = UTS + 150 x log (elongation)) was used to evaluate the modification efficiency of different La contents. The findings indicated that the modification efficiency in microstructures and mechanical properties of A356 alloy with 1.0 wt.% La are similar to those modified by the commercial modifier, 0.01 wt.% Sr. Furthermore, the results of thermal analysis reveal that there is no direct relationship between eutectic growth temperature and silicon morphology/modification rating. (C) 2009 Elsevier B.V. All rights reserved.
關聯:	JOURNAL OF ALLOYS AND COMPOUNDS
显示于类别:	[機械工程研究所] 期刊論文

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