Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 21    Special 2    August 2011

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Metastable phase of b-eucryptite and thermal expansion behavior of eucryptite particles reinforced aluminum matrix composite
WANG Li-dong1, CUI Ye1, YANG Cong-tao2, WANG Kang-peng1, FEI Wei-dong1, 3

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. Harbin Dongda High-tech Materials Co., Ltd., Harbin 150060, China;
3. School of Mechanical Engineering, Qinghai University, Xi’ning 810016, China

Abstract:The aluminum matrix composites with 15%, 35%, 55% and 75% (volume fraction) of b-eucryptite (Euc) particles were prepared by spark plasma sintering (SPS) process. To prevent the interfacial reaction between Euc and Al, ZnO was coated on the surface of Euc particles. The microstructures of Euc/Al composites were studied by optical microscope (OM) and transmission electron microscope (TEM). The phase compositions in the composite were studied by X-ray diffraction method. The thermal physical properties of Euc/Al composites were analyzed by means of thermal dilatometer. A metastable phase of Euc was discovered which may be produced by the high anisotropic residual stress in the composite. The metastable phase of Euc can transfer to normal Euc when the residual stress is relaxed by stress relief annealing process and has great influence on the CTE behavior of the Euc/Al composite.

 

Key words: aluminum matrix composite; β-eucryptite; metastable phase, thermal expansion; residual stress

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

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

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