高強度アルミニウム共晶系鋳造合金の開発

概要

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Aluminum alloys are one of the most widely used structural materials because of their good mechanicalproperties. Recently, however, more high strength and more high creep resistant materials are required in industrysuch as air space industry. The aim of this work is to develop a new high strength Al-base eutectic casting alloymade by commercial foundry technique. As an example, an Al-12.7 mass% Ce-5.5 mass% Ni-0.56 mass% Zr alloywas adopted for age hardening cast alloy, on which the age hardening behavior was studied and the hardeningmechanism was discussed. The alloy showed clear age hardening behavior and the hardeness reached a peak value of108.6 Hv for aging of 500 h at 573 K, which was about two times higher than that of as-cast state in the Al-12mass% Ce-5 mass% Ni eutectic cast alloy. The hardening mechanism was presumed to be due to Al3Zrprecipitation in the Al matrix phase. Finally, the Al-12.7 mass%Ce-5.5 mass% Ni-0.56 mass% Zr alloywas concluded to be a good candidate for new Al-base structural materials.
秋田大学の論文