SiC ウィスカー強化 Al 合金複合材料の機械的性質に及ぼす HIP 固化成形温度の影響(<特集>複合材料)

概要

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The effects of consolidating temperature on the strength, impact value, microstructure and fractograph of SiC whisker reinforced 6061 (1%Mg) and 5056 (5%Mg) composites were studied. The composites were fabricated with a powder metallurgical method using HIP. The optimum consolidating temperature was 625℃ (semi-liquid region) for the 6061 composite and 500℃ (solid region) for the 5056 composite. The quantitative analysis of Al_4C_3 using gas chromatography showed that the extent of the reaction between SiC whisker and Al was accelerated by the increase of Mg in the Al alloy. An examination of X-ray diffraction, SEM and EPMA revealed that in addition to Al_4C_3, the reaction produced Si in the 6061 composite and Mg_2Si in the 5056 composite. The degradation of strength and impact value at a higher consolidating temperature was considered to be due to the presence of such coarse reaction products as Mg_2Si and Si, coarse Al-Fe (Cr, Mn)-Si precipitates and the decrease of the Mg solution content in the Al rather than because of the decrease of interfacial bonding strength and the damage of SiC whiskers.
社団法人日本鉄鋼協会の論文
1989-09-01