Grain refinement of Mg-Al alloys with Al4C3-SiC/Al master alloy

被引：85
|
作者：
Liu, YH [1 ]
Liu, XF [1 ]
Bian, XF [1 ]
机构：
[1] Shandong Univ, Minist Educ, Key Lab Liquid Struct & Hered mat, Jinan 250061, Peoples R China
来源：
MATERIALS LETTERS | 2004年 / 58卷 / 7-8期
基金：
中国国家自然科学基金;
关键词：
Mg-Al-Zn alloys; grain refinement; heterogeneous nucleation; Al4C3; SiC; metals and alloys; metallurgy;
D O I：
10.1016/j.matlet.2003.09.022
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A novel Al4C3-SiC/Al master alloy for grain refinement of Mg-Al-Zn alloys has been developed in the present work. X-ray diffraction (XRD) and electron probe microanalysis (EPMA) results show the existence of Al4C3 and SiC particles in this master alloy. The master alloy presents good grain refining efficiency on both AZ31 and AZ63 alloys, but little effect on AZ91 alloy. After addition of 0.5 wt.% Al4C3-SiC/Al master alloy, the average grain size of AZ31 and AZ63 decreased dramatically from 1300 to 225 mum, and from 300 to 200 mum, respectively. However, no further refinement of grain size was achieved with additional amount of Al4C3-SiC/Al master alloy exceeding 0.5 wt.% for both AZ31 and AZ63 alloys in the present investigation. Duplex phase of Al4C3 and SiC was found to be located at the grain center of alpha-Mg and is proposed to be the nucleating agent during solidification of alpha-Mg. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：1282 / 1287
页数：6
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