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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 4    August 2002

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Aluminum matrix composite reinforced by
in-situ formed intermetallic Al3Ti
ZHAO Yu-hou(赵玉厚)1, ZHOU Jin-en(周敬恩)2, YAN Wen(严  文)1

1. Department of Materials Science and Engineering, 
Xi′an Ins titute of Technology, Xi′an 710032, China;
2. School of Materials Science and Engineering, 
Xi′an Jiaotong University, Xi′ an 710049, China

Abstract:The reinforced phase of in-situ formed intermetallic compound Al3Ti with grain size about 0.5μm in the aluminum matrix composite was achieved by the method of liquid-solid reaction under specific condition. The orientations were al so studied. The results show that under T6 heat treatment regime, the tensile strength, hardness, elastic modulus and elongation of Al3Ti/ZL101 in-situ composite are increased by 32.8%, 14.4%, 19.2% and 14.6% respectively in comparison with those of ZL101. Al3Ti is uniformly distributed in α(Al) matrix with a clear phase interface, and the orientation relationship between Al3Ti and α(Al) is (006)Al3Ti∥(0-22)Al,[1-22]Al3Ti[11-0]Al. The strengthening mechanisms of Al3Ti/ZL101 in-situ compo site is proved to be caused by fine grain size, spreading distribution and dislocation multiplication.

 

Key words: in-situ composite; microstructure; mechanical properties; reinforcement mechanism

ISSN 1672-7029
CN 43-1423/U

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