一种Cu-Cr-Nd合金的冷变形及时效特性

采用真空感应熔炼技术浇铸Cu-0.8Cr-0.1Nd(wt%)合金.经过固溶处理、变形和时效处理,利用金相显微镜、显微硬度计、电导仪分析其在铸态以及经过各阶段处理后的显微组织、硬度、电导率的变化.结果表明,添加稀土元素Nd能对铜合金基体起到明显的净化作用,而且对晶粒有一定的细化作用.从实验中还可以看到,Cu-0.8Cr-0.1Nd合金随着时效时间的延长,硬度变化都是先增大而后减小,且变形量越大硬度越小.当达到峰值后,变形量越大的合金硬度下降的幅度越大.不同变形量的合金在时效初期电导率迅速上升,随着时效时间的延长电导率处于平缓上升的趋势,且变形量越大的合金电导率也越大.

Properties of a Cu-Cr-Nd Alloy Treated by Cold-Deformed and Aged

Cu-0.8Cr-0.1Nd(wt%) alloy was cast by median frequency vacuum induction furnace,afterward treated by solid solution,cold-deformed and aging.The microstructure,microhardness and conductivity in each process were investigated by optical microscopy,microhardness tester,and conductivity tester.The results indicate that the adding of Nd can obviously purify the Cu-matrix and refine its grains.With an increase of time of aging,the microhardness of Cu-0.8Cr-0.1Nd alloy first increased,then decreased,however the more cold-deformed of the alloy,the lower hardness was.Conductivity of the alloy after different cold-deformation increased notably,and then went smoothly.But the more the cold-deformed of the alloy,the higher conductivity it was.