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Byong-Sun Chun Engineering Research Center for Rapidly Solidified Materials, Chungnam National University, Daejeon 302-764, Korea

Kenji Hiraga Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980, Japan (Received 11 April 1994; accepted 10 May 1994)

The microstructure of gas-atomized Al-20 wt. % Si—1 wt. % Ni powders was investigated by electron microscopy. Primary Si crystals about 2 /JLUI in size are homogeneously distributed in the Al matrix. Eutectic Si crystals about 50 nm in size are precipitated with the definite crystallographic relationship of (110)Si ||

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