Sc对Cu-0.65Cr合金时效析出行为与强化作用的影响  

Effect of Sc on Aging Precipitation Behavior and Strengthening of Cu-0.65Cr Alloy

作　　者：龚清华 陈辉明[1] 周晨阳 黄松炜 谢伟滨[1] 汪航[1] 杨斌[1] GONG Qinghua;CHEN Huiming;ZHOU Chenyang;HUANG Songwei;XIE Weibin;WANG Hang;YANG Bin(Faculty of Materials,Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000

出　　处：《有色金属工程》2024年第11期41-48,共8页Nonferrous Metals Engineering

基　　金：江西省科技厅自然科学基金青年重点项目(20192ACBL21012)。

摘　　要：采用EBSD、TEM、硬度及导电率测试等手段,研究了Sc对Cu-0.65Cr合金时效行为、强化作用与抗软化性能的影响。结果表明,冷轧态Cu-0.65Cr和Cu-0.65Cr-0.2Sc合金在时效过程中会析出强化相,提升合金硬度与导电率。其中,Cu-0.65Cr-0.2Sc合金中会形成两种纳米尺度析出相粒子,即球状的面心立方结构富Cr相与短棒状的体心立方结构CuSc相。这两种析出相共同产生弥散强化作用要高于Cu-0.65Cr合金中富Cr相单独产生的弥散强化作用,致使峰时效Cu-0.65Cr-0.2Sc合金具有比Cu-0.65Cr合金更高的硬度值,其硬度值达到188 HV。此外,添加Sc能够提高Cu-Cr合金的再结晶温度,同时减缓富Cr相的粗化。因此,峰时效态Cu-Cr-Sc合金的软化温度能够达到550~570℃,高于Cu-Cr合金的软化温度(490~510℃)。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℃).

关 键 词：CU-CR合金 时效 强化 软化温度 

分 类 号：TG146[一般工业技术—材料科学与工程]