Synthesis and Evaluations of Microstructure Properties on Al-(50, 60, 70 mass%)Si Systems by Mechanical Alloying

Abstract:

High silicon Al-Si alloy powders having nanocrystalline structures have been produced by mechanical alloying process. Microstructures in mechanically alloyed Al-Si powders were investigated by scanning electron microscopy and transmission electron microscopy. X-ray diffraction analyses were also carried out to characterize lattice constant, crystallite size and misfit strain. Effective milling time for the formation of nanocrystalline microstructure was thought to be approximately 12 hours, and the sizes of Al and Si crystallites in mechanically alloyed powders after longer than 12 hours of milling were reduced to about 30nm and 70nm respectively, in Al-70 mass% Si alloy system. The misfit strains increased with milling time up to 240 hours, and saturated to 5.73×10^-3 and 4.39×10^-3 for Al and Si crystallites, respectively.

• Periodical: Materials Science Forum (Volumes 449-452)
• Pages: 249-252
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.449-452.249
• Online since: March 2004
• Authors: Jung Il Lee, Tae Whan Hong, Il Ho Kim, Soon Chul Ur, Young Geun Lee, Sung Lim Ryu
• Keywords: Crystallite Size, High Silicon Al-Si Alloy Systems, Mechanical Alloying (MA), Misfit Strain, X-Ray Diffraction (XRD)

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