Cu-0.99Cr合金的组织和力学性能研究

Microstructure and Mechanical Properties of Cu-0.99Cr Alloy

在大气环境下采用普通中频感应电炉制备了Cu-0.99Cr合金,并研究分析了该合金的铸态和热处理态的显微组织和力学性能。试验结果表明,铸态和固溶时效合金中所存在的相为α-Cu、Cr。铸态时部分Cr溶于基体中,部分Cr以第二相形式存在。合金铸态试样的拉伸强度为211.5MPa,硬度为85.8HB。对铸态合金试样经980℃×1h固溶(水淬)→470℃×4h时效(空冷)热处理后,过饱和固溶体分解析出了更多的Cr相。其拉伸强度和硬度分别提高到274.6MPa和116.9HB。

Cu-0.99Cr alloy is prepared with common medium frequency induction furnace in the air. The microstructures and mechanical properties of the alloy in as-cast and heat-treatment are investigated. It is found the existent phases of as-east alloy and alloy after heat treatment are α-Cu and Cr. Some amount of chromium form solution with Cu in as-cast alloy, the residual chromium exists in the form of Cr. The tensile strength and hardness of Cu-0.99Cr alloy as-cast is 211.5 MPa and 85.8HB respectively. More chromium precipitates exist in the alloy after solution and aging heat treatment. The mechanical properties of the alloy can improve uheriorly by heat treatment and the tensile strength and hardness reach 274.6MPa and 116.9HB respectively.