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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 2    April 2001

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Microstructural characteristics of intermetallic phases in-spray
deposition Al-8.5Fe-1.3V-1.7Si alloy
JIN Tou-nan(金头男)1,2, XIAO Yu-de(肖于德)1, LI Wen-xian(黎文献)1,
YIN Zhi-min(尹志民)1, LI Dou-xing(李斗星)2

1. Department of Materials Science and Engineering,
Central South University, Changsha 410083, P.R.China;
2. Laboratory of Atomic Imaging of Solids, Institute of Metals Research,
Chinese Academy of Sciences, Shenyang 110015, P.R.China

Abstract:Analysis electron microtechnique (AEM) and high resolution electron microtechnique (HREM) studies were conducted on a spray deposition Al-8.5Fe-1.3V-1.7Si(mass fraction, %) alloy to determine the characteristics of the intermetallic phases. The results show that the striking characteristics of the microstructures in as-deposited and as-extruded alloys indicate the presence of a large amounts of homogeneously distributed fine particles and a few coarse particles, while small amount of eutectics consisted of α(Al) and α-AlFeSi are found in local zone in as-deposited alloy. The fine particle is identified to be bcc αAlFeSi phase, and the coarse particles are monoclinic α-A13Fe4 equilibrium phase, bcc α-AlFeSi phase and newly found hexagonal h-AlFeSi metastable phase. In α-Al13Fe4, stacking faults on (100) and (001) plane and microtwin on (100) twinning plane are frequently observed. The extra reflection spots in α-AlFeSi reflection pattern can be induced by α-AlFeSi superstructure. The hexagonal metastable phase transforms to bcc phase, and the compositions of two phases are very similar. A close crystallographic orientation relationship between hexagonal and bcc phases are determined, and HREM image shows that the interface between them is coherent.

 

Key words: Al-Fe-V-Si alloy; spray casting, intermetallic phase, orientation relationship; phase interface

ISSN 1672-7029
CN 43-1423/U

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