鉄製金型に鋳造したAl-0.5 mass%Zr合金の時効による硬度と導電率に及ぼすSi添加の影響

概要

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Aluminum casting alloy with high strength, high conductivity, and heat resistance is required as the secondary conducting material for the high speed induction motor. The liquidus of Al-0.5%Zr-xSi (x=0.02-1.0 mass%) alloy were calculated by CALPHAD method, and casting temperature was decided. Effects of Si content on hardness and conductivity changes during aging at 623-723K of Al-0.5 mass%Zr-xSi alloys cast process in iron mold were studied, and the heat resistance at 423K for alloy with optimum characteristic was investigated. A small addition of Si accelerated the hardening and high conductivity of the Al-0.5 mass%Zr remarkably. The maximum hardness was obtained by aging at 673K. Hardness and conductivity of Al-0.5%Zr-0.45%Si alloy aged at 673K for 28.8ks was 61.7HB and 55 IACS%, respectively, and these characteristics in room temperature hardly changed by isothermal treatment at 423K.
社団法人日本機械学会の論文
2005-11-25