新型Al-Ca-C中间合金对AZ91合金的细化作用

刘英; 郭红; 李卫

doi:10.15980/j.tzzz.2012.09.014

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新型Al-Ca-C中间合金对AZ91合金的细化作用
Grain Refinement Effects of New Al-Ca-C Master Alloy on AZ91 Magnesium Alloy
2012年32卷第9期页码：796-798
纸质出版日期： 2012 ，
DOI： 10.15980/j.tzzz.2012.09.014

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[1]刘英,郭红,李卫.新型Al-Ca-C中间合金对AZ91合金的细化作用[J].特种铸造及有色合金,2012,32(09):796-798.

Liu Ying, Guo Hong, Li Wei. Grain Refinement Effects of New Al-Ca-C Master Alloy on AZ91 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2012,32(9):796-798.
[1]刘英,郭红,李卫.新型Al-Ca-C中间合金对AZ91合金的细化作用[J].特种铸造及有色合金,2012,32(09):796-798. DOI： 10.15980/j.tzzz.2012.09.014.

Liu Ying, Guo Hong, Li Wei. Grain Refinement Effects of New Al-Ca-C Master Alloy on AZ91 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2012,32(9):796-798. DOI： 10.15980/j.tzzz.2012.09.014.

摘要

以Al粉、CaC2粉为原料

采用粉末冶金及原位合成法制备了一种新型Al-Ca-C中间合金用于AZ91合金的晶粒细化

Al-Ca-C中间合金中含有Al4C3、CaAl2、CaAl4相。试验表明

该中间合金对AZ91镁合金有良好的晶粒细化作用。当加入1.0%的Al-Ca-C中间合金时

AZ91合金的晶粒尺寸由原来的120～150μm减小到40～50μm。分析认为镁合金的细化机理为

Al4C3充当了α-Mg的异质形核核心

熔体中Ca与C原子则由于成分过冷进一步促进了晶粒细化。

Abstract

A novel Al-Ca-C master alloy was fabricated with Al powder and CaC2 powder as raw materials by powder metallurgy method combining with in-situ synthesis process to use for grain refinement of Mg-Al based alloys

and Al4C3

CaAl2

CaAl4 phase can be observed in the master alloy prepared.The results reveal that the master alloy can refine AZ91 magnesium alloy effectively.With the addition of 1% Al-Ca-C master alloy（weight percentage）

the grain size of AZ91 alloy is decreased from 120

50 μm to 40

0 μm.The refining mechanism on grain size in AZ91 magnesium alloy by the Al-Ca-C master alloy was discussed

and it was pointed out that Al4C3 formed could be acted as heterogeneous nucleation substrates for primary Mg

and Ca and C were believed to increase the grain refinement efficiency by the constitutional under-cooling.