Materials Transactions Online

Materials Transactions, Vol.51 No.05 (2010) pp.1055-1058
© 2010 The Japan Institute of Metals

Etching Effect on Microstructural Behavior of Gas Atomized Al-20 mass%Si Alloy Powder

Soon-Jik Hong

Division of Advanced Materials Engineering & Institute for Rare Metals, Kongju National University, 275, Budae-dong Cheonan City, Cheongnam 330-717, Korea

In this research, a metallographic investigation of as atomized Al-20 mass%Si alloy powders, etched at surface and cross-section, was conducted by scanning electron microscopy. The surface micrographs of the etched powders showed the existence of primary Si and eutectic Si on the microstructure of the powder surface, and satellite particles adhering to the larger particles, while it was impossible to observe the surface microstructure in the case of the non-etched powder surface. The coarse primary Si phases in these powder particles were not present, indicating that their formation was effectively suppressed by the rapid solidification. In addition, it was possible to observe the microstructure of satellite powder surface such as fine cellular or featureless structure due to surface etching.

(Received 2010/1/8; Accepted 2010/3/1; Published 2010/4/25)

Keywords: aluminum-silicon powder, gas atomization, etching, microstructure, satellite powder

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