混合稀土(La-Ce)在快速凝固Cu-Cr合金中的作用  

Effect of Rare Earth (La-Ce) on Rapidly Solidified Cu-Cr Alloy

作　　者：徐顺建[1] 张萌[1] 

机构地区：[1]南昌大学材料科学系,江西南昌330047

出　　处：《材料热处理学报》2005年第4期74-78,共5页Transactions of Materials and Heat Treatment

基　　金：教育部高等学校骨干教师资助计划资助(GG-430-11902-1010);江西省自然科学基金资助项目(0050022)

摘　　要：比较了混合稀土(LaCe)对快速凝固CuCr合金不同状态下组织和性能的影响,结果表明:在急冷态,稀土元素消除了CuCr合金部分柱状晶,稀土元素本身的添加使显微硬度有所提高;抑制时效后CuCr合金二次Cr颗粒的析出,使硬度值随时效温度变化相对比较平稳,提高热稳定性,延缓了过时效的发生。此外,稀土元素改变了CuCr合金共晶组织的短棒状或层片状形态,大多以网状共晶组织存在,经退火共晶组织更加清晰化。The microstructure and hardness of Cu-Cr and Cu-Cr-RE alloys rapidly quenched and aged were studied by optical microscope, micro-hardmeter, SEM and SIMS. The results show that the growth of partial columnar grain is suppressed and the hardness is increased due to the addition of rare earth elements (La-Ce) in the rapidly quenched alloys. The precipitation of second Cr particles is suppressed during aging treatment, by adding rare earth elements, so the mechanical property of Cu-Cr-RE alloy at elevated-temperature is improved. The eutectic structure in Cu-Cr alloy changes from short-rod and lamellar eutectic structure to network eutectic structure in Cu-Cr-Re alloy.

关 键 词：混合稀土(La-Ce) 时效处理 CU-CR合金 快速凝固 

分 类 号：TG113.12[金属学及工艺—物理冶金]