摘要
在中频感应炉中用大气熔铸方法制备了CuCr25以及CuCr25RE合金触头材料,利用扫描电镜对其铸态及锻态的显微组织进行了观察和比较,并探讨了微量稀土对CuCr25电导率及软化温度的影响。结果表明:合金经锻造后可以获得均匀的组织分布,但添加稀土后Cr颗粒明显细化;合金添加稀土元素并经950℃×1h固溶,再在不同温度下进行时效处理,可有效地提高合金的电导率;对固溶后的CuCr25、CuCr25RE合金施以40%冷变形再进行480℃时效处理,其电导率较固溶后直接时效处理的有显著提高;添加微量稀土元素对合金的抗软化性能有所改善,使CuCr25合金的软化温度提高了约25℃。
The atmospheric cast CuCr25 and CuCr25RE alloy contact material which were prepared by medium frequency induction furnace was studied. The microstructure of CuCr25 and CuCr25RE alloy after casting and forging were observed and compared by SEM. And the effect of rare earth （RE） on the electrical conductivity and softening temperature of CuCr25 alloy was discussed. The results show that the microstructure distributes homogeneously after forging, but with the addition of RE,Cr particles were refined obviously. And after solution at 950℃ for 1 h and aging at different temperature, the addition of RE improves the electrical conductivity of the alloy. Aged at 480℃ after 40% cold deformation, the value of electrical conductivity improves significantly compared with that without deformation. The RE additive improves the softening resistance, which can increase the softening temperature of CuCr25 alloy about 25℃.
出处
《热加工工艺》
CSCD
北大核心
2006年第24期16-18,27,共4页
Hot Working Technology
基金
河南省杰出青年基金资助项目(0512002700)
河南省高校创新人才培养工程(豫教高2005-126)
关键词
稀土
固溶
时效
电导率
软化温度
rare earth
solid solution
aging
electrical conductivity
softening temperature
