Effect of Sc on Aging Precipitation Behavior and Strengthening of Cu-0.65Cr Alloy
The effect of Sc addition on the aging behavior,mechanical properties and softening resistance of a Cu-0.65Cr alloy was investigated by EBSD,TEM,hardness testing,and electrical conductivity testing.Findings reveal that the strengthening phases precipitated in cold-rolled Cu-0.65Cr alloy and Cu-0.65Cr-0.2Sc alloy during aging,resulting in the improvement of hardness and electrical conductivity.There were two types of precipitates formed in the Cu-0.65Cr-0.2Sc alloy:spherical Cr-rich precipitate with a face-centered cubic structure and rodlike CuSc precipitates with a body-centered cubic structure.The dispersion strengthening produced by joint precipitation of these two types of precipitates is higher than that produced by Cr-rich precipitate alone in the Cu-0.65Cr alloy.A higher hardness value of about 188 HV is obtained in the peak-aged Cu-0.65Cr-0.2Sc alloy.In addition,the addition of Sc increases the recrystallization temperature and slowed down the coarsening of the Cr-rich precipitates.Therefore,the peak-aged Cu-0.65Cr-0.2Sc alloy exhibites a higher softening temperature(550-570 ℃)compared to the peak-aged Cu-0.65Cr alloy(490-510 ℃).
Cu-Cr alloyaging treatmentstrengtheningsoftening temperature
万方数据
维普
