減圧鋳造-燃焼合成法(LCCSプロセス)によるAl/Al_3Ti複合材料のプロセシング(J09-6 プロセス,J09 知的材料・構造システム)

概要

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The low-pressure casting/combustion synthesis (LCCS) process has been proposed to fabricate near-net-shape metal-matrix-composites (MMCs), where combined effects occurring during these two processes are utilized. Near-net-shape Al_3i-reinforced Ti-matrix composite has been produced without cavities by LCCS, and the microstructure and mechanical properties have been investigated. It is found that molten Al substantially can infiltrate into a mixture of Al and Ti powders when the mixture ratio of Al to Ti is high, or a mixture of Al and Ti powders contains more than 50at. % Al. In the case when the mixture ratio is low, or a mixture of Al and Ti powders contains less than 50 at. % Al, infiltration by molten Al becomes negligible. A critical mixture ratio of Ti powder to Al powder can be estimated by using a simple formula expressed by the relative density of Al and Ti powder mixtures to produce MMCs. When the powder ratio of Ti to Al is larger than the critical value, the volume fraction of Al_3Ti decreases with increasing content of Ti powder.
社団法人日本機械学会の論文
2004-09-04