微量元素对Al-Cu-Li合金热暴露后显微组织和性能的影响

Trace Element Effects on Microstructure and Mechanical Properties in Al-Cu-Li Alloy after Thermal Exposure

研究了微量Ce、Ag对一种Al-Cu-Li合金热暴露后显微组织和性能的影响。Ce的添加提高T1相的抗粗化能力,有利于稳定合金热暴露后的力学性能;Ag的缺少降低了T1相的稳定性,使合金在150℃热暴露后的强度损失较大,但却使合金在200℃热暴露后保持较高的强度,这与不含Ag的合金在200℃热暴露时大量θ′相析出有关。

The effects of trace element Ce, Ag on the microstructure and mechanical properties of Al-Cu-Li alloy after thermal exposure have been investigated. It＇s found that addition of Ce enhances coarsening resistance behavior of T1 phase, improving stability of mechanical properties after thermal exposure. The presence of Ag brings about great reduction of the strength at 150℃ thermal exposure condition, but improves the strength at 200℃ thermal exposure condition which is related to a great number of θ precipitates at the free-Ag alloy after 200℃ thermal exposure.