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

Vol. 21    No. 10    October 2011

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Effect of TiB2 addition on microstructure of
spray-formed Si-30Al composite
GAN Gui-sheng1, 2, ZHANG Lei1, BEI Shu-yu1, LU Yi1, YANG Bin1
(1. State Key Laboratory for Advanced Metals and Materials,
University of Science and Technology Beijing, Beijing 100083, China;
2. School of Materials Science and Engineering,
Chongqing University of Technology, Chongqing 400050, China
)
Abstract: An in situ reaction and spray forming technique were employed in the synthesis of 2% TiB2/ Si-30Al composite. The formation mechanism of TiB2 particulates was explained based on thermodynamic theory. The modification of the primary Si in the Si-30Al alloy was interpreted in the light of the knowledge of atomic diffusion. The experimental results show that adding 2% TiB2 to the Si-30Al alloy can effectively refine the primary Si. Moreover, the coarsening and growth of primary Si phase in its semi-solid state was retarded effectively due to the existence of the TiB2 particulates.
Key words: spray forming; TiB2 particulate; coarsening; semi-solid state
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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