Thermal Analysis of Precipitate Dissolution in Binary Al-Li Alloy

摘要

In this paper,the activation energy for precipi-tate dissolution in binary AI-Li alloy has been in-vestigated by considering precipitate dissolution inAl-Li alloy,continuously heated as a thermally ac-tivated process.The proposed calculation was car-ried out by changing the scanning rate in DSCmeasurement.The results show that the formationof GP zone is easy because the activation energy forits dissolution is smaller than that for Li atom diffu-sion in the matrix.The δ′dissolution consists of twosteps:the first step needs larger thermal activationto break down the superlattice structure,and thesecond is much easier like GP zone dissolution.Thephase is the most stable,which needs much largerthermal activation to disappear.