一种Cu-Cr-Nd合金的冷变形及时效特性

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

采用真空感应熔炼技术浇铸Cu-0.8 Cr-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。

Cu-0. 8Cr-0. 1 Nd （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-matfix 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.