关键词: Cu-Cr-Zr合金, 固溶温度, 微观组织, 硬度, 导电率

Abstract: Cu-0.8Cr-0.08Zr copper alloy was prepared by upward continuous casting method with atmosphere protection, and drawing with deformation amount of 49% at room temperature was carried out on the alloy. The effect of solution temperature on microstructure, hardness, and conductivity of the Cu-0.8Cr-0.08Zr copper alloy was studied by means of metallographic microscopy, energy dispersive spectroscopy, eddy current conductivity meter, and hardness tester. The results show that with the increase of solution temperature, the dendritic grains of the as-cast Cu-0.8Cr-0.08Zr alloy gradually disappear, and the grain size increases. The fibrous grains of the cold-drawn Cu-0.8Cr-0.08Zr alloy gradually vanish, and a large number of twins appear. The hardness of both the as-cast and cold-drawn Cu-0.8Cr-0.08Zr alloys decreases sharply at first and then levels off, while the electrical conductivity first decreases and then increases. The optimal solution treatment process for the as-cast Cu-0.8Cr-0.08Zr alloy is to hold at 940 ℃ for 1 h, with the hardness of 58 HBW and conductivity of 52%IACS. The optimal solution treatment process for the cold-drawn Cu-0.8Cr-0.08Zr alloy is to hold at 920-960 ℃ for 1 h, with the hardness of approximately 56 HBW and conductivity of 55%IACS.

Key words: Cu-Cr-Zr alloy, solution temperature, microstructure, hardness, conductivity