关键词: Al-Li合金, 均匀化, 电场, 显微组织, 力学性能

Abstract:

The homogenization treatment with an electric field of Al Li alloy is investigated by means of scanning electron microscope(SEM) and electron probe microanalyzer(EPMA). The experimental results show that the electric field treatment promotes the homogenization process of 2091 Al Li alloy. But, increasing the duration of the electric field, it produces the upward diffusion and results in the non equilibrium segregation of Mg and Cu atoms. Therefore, the combined homogenization treatment with and without an electric field is an effective method of homogenization treatment. At the same time, the effect of homogenization treatment with an electric field on the microstructure and the mechanical properties is studied. It shows that the homogenization treatment with an electric field accelerates the nucleation of T1 precipitation phase, retards the formation of δ' and S' precipitation phases and improves the properties.

Key words: Al-Lialloy, homogenization, electric field, microstructure, mechanical properties