时效工艺对Cu-12%Fe合金组织性能的影响

用熔铸法制备了Cu-12%Fe合金,研究了经1000℃固溶后不同时效工艺对合金的相组成、显微组织、硬度及电导率的影响.结果表明,550℃时效可细化合金的Fe枝晶.消除Cu基体枝晶偏析并改变晶面间距.合金硬度在时效初期时下降,随后增加并达到最大值后再次下降.在350℃和450℃时效时,电导率随时效时间增加而上升.在550℃和650℃时效时,电导率随时效时间先增加而后下降.对Cu-12%Fe合金固溶并在550℃时效4h,可以获得良好的力学和电学性能匹配.

Effect of aging process on microstructure and properties of Cu-12% Fe alloy

Cu-12 % Fe alloy was prepared by fusion casting. The phases, microstructure, hardness and conductivity were investigated for the alloy quenched at 1000℃ and aged at different temperatures for different time. The results show that aging treatments at 550℃ after quenching can refine the primary Fe dendrites, remove the dendritic segregation in Cu matrix and change the interplanar spacing of Cu phase in the alloy.Hardness of the alloy decreases firstly and then increases up to a maximm value with the increase in aging time. Conductivity of the alloy inereases with increasing aging time at 350 ～ 450℃. The conductivity firstly increases and then decreases with the increase of aging time at 550 ～650℃. It is suggested that the exeellent mechanieal and electrical properties are obtained for Cu-12%Fe alloy quenched and then aged at 550℃for 4h.