Electron microscope study of Al-Fe-Si intermetallics in 6201 aluminum alloy

被引：152
作者：
Mulazimoglu, MH
Zaluska, A
Gruzleski, JE
Paray, F
机构：
[1] MCGILL UNIV, DEPT MIN & MET ENGN, MONTREAL, PQ H3A 2A7, CANADA
[2] MCGILL UNIV, DEPT PHYS, MONTREAL, PQ H3A 2A7, CANADA
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1996年 / 27卷 / 04期
关键词：
D O I：
10.1007/BF02649760
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The Al-Fe-Si intermetallics present in a commercial cast 6201 electrical conductor alloy have been studied using high resolution electron microscopy. The beta-Al5FeSi phase is highly faceted and contains multiple (001) growth twins parallel to the growth direction, The alpha-Al8Fe2Si phase which forms in a Chinese script morphology has a nonfaceted interface with the aluminum matrix and exhibits no growth twinning. Formation of the beta phase is believed to occur via a peritectic decomposition of alpha-Al8Fe2Si at 612 degrees C. Observations made by transmission electron microscopy (TEM) support this hypothesis. When 30 ppm strontium is added to this alloy, the alpha phase is stabilized and very little beta-Al5FeSi appears in the microstructure. A silicon-rich layer is found around the alpha-phase particles. It is proposed that strontium adsorbs to the alpha-phase interface, and in so doing, the diffusion of silicon into the ct phase, necessary for its transformation to beta, is prevented.
引用
收藏
页码：929 / 936
页数：8
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