Al-Mg-Si合金的凝固过程|吴锵,孙斐,孙强金,姜石峰-《中国有色金属学报》官方网站|全网首发|论文开放获取

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第10卷第5期总第38期 2000年10月

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文章编号：1004-0609(2000)05-0688-04

Al-Mg-Si合金的凝固过程

吴锵^１，孙斐^１，孙强金^１，姜石峰^２

(1. 南京理工大学材料科学与工程系，南京 210094;
2. 韩国机械研究院材料工程部, 韩国)

摘要: 研究了AlMgSi合金的凝固过程，用不同方法测量了合金成分与冷却速度对该合金系铸态组织的影响。通过形态分析确定了AlMgSi合金的凝固顺序，用EPMA测定了非平衡过程的溶质分布，并发现FeSiAl₄_～5相成分在高冷速时为FeSiAl₅，而在低冷速时为FeSiAl₄。晶界附近发现了无溶质带(NSZ)，并从固态扩散和凝固溶质再分配两个方面分析了NSZ的形成原因。

关键字: 铝合金；铸态组织；溶质分布；无溶质带

Solidification process of AlMgSi alloys

WU Qiang^１, SUN Fei^１, SUN Qiangjin^１, KANG Shifeng^２

（1. Department of Materials Science and Engineering,Nanjing University of Science and Technology, Nanjing 210094, P.R.China；
2. Materials Engineering Department, Korea Institute of Machinary and Metals, Changwon 641010, Korea）

Abstract:The solidification process of AlMgSi alloys was studied. The composition and cooling rate were changed and their influences on ascast microstuctures were studied. The solidification paths of AlMgSi alloys were determined by the analysis of microstructure. The solute distribution during nonequilibrium solidification process was measured by EPMA . It was found that the composition of FeSiAl₄_～₅ phase was FeSiAl₅ at high cooling rate and FeSiAl₄ at low cooling rate. No solute zone (NSZ) was found in the matrix in the vicinity of boundary, the mechanism of the formation of NSZ was analyzed with the theories of solid diffusion and solute redistribution.

Key words: AlMgSi alloys; ascast microstucture; solute distribution; no solute zone

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW