回归时间对Al-9.74%Li合金析出δ′相的影响

Effects of Retrogression Time on δ′ Precipitation in Al-9.74%Li Alloy

采用X射线方法研究回归时间对Al-9.74%Li合金经回归再回火处理析出δ′相的影响.结果表明,由于δ′相粒子的溶解导致样品硬度在短期回归时间内明显下降;并随回归时间的延长引起δ′相粒子的再析出及粗化,从而使样品硬度出现一个较弱的峰值,然后继续单调下降.

Xray method was used to investigate the effect of retrogression time on δ′ precipitation in an Al974%Li alloy treated by retrogression. The investigation results show that the hardness clearly drops in short retrogression time due to the dissolution of δ′ particles. A weak peak value of hardness was achieved and gradually dropped due to the δ′ particles reprecipitation and coarsening because of increasing retrogression time.