Cu-Cr-Zr合金热处理组织及其力学性能

Microstructure and mechanical properties of Cu-Cr-Zr alloy after heat treatment

通过金相组织观察和力学性能测定研究了固溶和时效热处理对Cu-Cr-Zr合金合金锻件组织和力学性能的影响规律。结果表明,随固溶温度的提高合金锻件硬度连续下降,当固溶温度大于995℃后,合金充分固溶,形成单相固溶体组织;随时效温度的提高,合金锻件硬度在450℃出现峰值,在大于450℃后合金硬度和抗拉强度趋于下降,但塑性提高;时效状态下的主要组成相为富Cu和富Cr固溶体以及Cu10Zr7金属间化合物相;富Cr固溶体与Cu10Zr7复合生长,以富Cr固溶体为先析出相,呈鹅卵形态。

The effects of solid solution and aging on the microstructure and properties of a Cu-Cr-Zr alloy forgings were investigated with the microstructure and mechanical property test. The results show that the hardness of the forged alloy decreases with increasing of solid solution temperature and the full solid solution appears at 995 ℃ to form single solid solution phase ; the hardness of the forged alloy reaches a peak value at 450 ℃ aging, the tensile strength decreases as increasing of aging more than 450 ℃, while the elongation increases. Main phases in aged alloy are Cu-rich and Cr-rich solid solution, and Cu10Zr7 intermetallic compound. Cr-rich and Cu10Zr7 are compound growth together with Cr-rich precipitation first which aooears e~ shane.