Cu-1.2Cr-0.6Fe合金微观组织和力学性能的研究

Study on Microstructure and Mechanical Properties of Cu-1.2Cr-0.6Fe Alloy

在大气环境下采用熔铸法制备了Cu-1.2Cr-0.6Fe合金,利用OM、XRD和EPMA分析研究了该合金铸态和热处理态的显微组织,并利用INSTRON5882电子万能材料试验机和HBE-300型电子布氏硬度计分别测试了该材料的拉伸性能和硬度。结果表明,Cr与Cu不能形成化合物,可有限固溶于纯铜中,超过部分形成过剩的第二相。Fe具有固溶强化效应和细化晶粒的作用,能改善合金力学性能。合金材料铸态试样的拉伸强度、硬度分别为247.65MPa和67.6HB。铸态合金试样经960℃×1h固溶(水淬)→470℃×6h时效(空冷)热处理后,可析出细小弥散的第二相质点,其硬度值可提高到98.7HB。

Cu-1.2Cr-0.6Fe alloy was prepared in air by melting-casting method. The microstructure of the alloy as-cast and as-heat-treatment was analyzed by OM, XRD and EPMA. The mechanical properties of the alloy were also tested by electron-universal material testing machine and hardness meter respectively. The results show that Cr with Cu can not form compound, but solution in pure Cu. The residual Cr will form the second phase. The iron can improve the mechanical properties by solution and fining grains. The tensile strength and hardness of Cu-1.2Cr-0.6Fe alloy as-cast is 247.65 MPa and 67.6 HB respectively. Solution and aging heat treatment of the alloys can acquire fining and dispersing precipitate phases. The mechanical properties of the alloy can improve ulteriorly by heat treatment and the hardness reaches 98.7 HB.