PM法により作製したNi-NiO系複合材料の組織と硬度(<小特集>先進材料と信頼性解析・評価)

概要

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Oxide-dispersion-strengthened Ni-NiO composites were prepared by the powder metallurgy technique. The nickel oxides were added at the 1〜15wt.% level. Control materials were also prepared without NiO added. The distribution of the NiO phase and grain size of nickel matrix were observed metallographically in materials sintered at 1473〜1673K for 10.8 ks. The Vickers micro hardness of as-sintered materials was measured in order to investigate the correlation between the microstructure and the room-temperature mechanical properties. The Vickers micro hardness of the samples sintered over 1573K increased almost linearly with NiO content. That of samples sintered below 1573K was smaller than that of samples sintered over 1573K. From the viewpoint of hardness, it was desirable to sinter samples at a temperature over 1573K. NiO particle growth was found to be governed by the Ostwald ripening law. The Vickers micro hardness was proportional to the root of the reciprocal grain size.
一般社団法人日本機械学会の論文
1995-09-25