Al-Ag合金の時効硬化と復元

概要

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Effect of the specimen surface and grain boundary on the aging of Al-3,5 and 10mass%Ag alloy was studied by hardness test and by measurement of electrical resistance. Aging of the specimen quenched from rather low temperature was suppressed remarkably in the surface layer. The surface is considered to act as effective sinks and the effect suppresses competitive growth of GP zones, especially when the concentration of quenched vacancy is low. The grain boundary is considered to be an easy path for vacancy migration rather than an effective sink, judging from the dependence of age hardening at the grain boundary. Also, rate of reversion was faster in the surface layer than in the interior when the age hardened specimen was annealed at 353K. It is considered that the action of surface as a source of vacancies increases the vacancy concentration in the region near surface relative to the interior.
岡山理科大学の論文