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

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Transactions of Nonferrous Metals Society of China

Vol. 21    Special 1    March 2011

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Dispersion of ultrafine SiC particles in molten Al-12Si alloy
Jin-Ju PARK, Sang-Hoon LEE, Min-Ku LEE, Chang-Kyu RHEE

Nuclear Materials Research Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea

Abstract:The bulk Al-12 Si eutectic composites were fabricated through a conventional liquid metal casting route, especially with the help of ultrafine ceramic powders made by self-propagating high-temperature synthesis (SHS) process. The SHS powders were fabricated by the chemical reaction between micro-sized SiC and Al particles at very high combustion temperatures, producing the coarse Al particles (several tens of microns) containing ultrafine SiC ceramic particles. Microstructural observation revealed that the addition of ultrafine SiC particles has a crumbling tendency of Si eutectic phase. It is suggested that the casting method combined with SHS process is promising for fabricating the Al-based MMC with ultrafine ceramic particles.


Key words: Al-12Si alloy; dispersion; self-propagating high-temperature synthesis (SHS); ultrafine ceramic; SiC

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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