大气熔炼制备Cu-Cr-Ti合金时效动力学研究  

Study on Aging Kinetics of Air-smelted Cu-Cr-Ti Alloys

作　　者：刘耀 张建波[2,3] 蔡薇 李勇[2] 

机构地区：[1]江西省有色金属加工工程技术研究中心,江西赣州341000 [2]浙江大学材化学院,浙江杭州310058 [3]江西理工大学工程研究院,江西赣州341000

出　　处：《热加工工艺》2016年第6期223-226,229,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51461017);国家自然科学基金资助项目(51261007);江西省教育厅项目(GJJ14447);江西省教育厅青年基金资助项目(GJJ14443)

摘　　要：采用大气熔炼制备了Cu-Cr和Cu-Cr-Ti合金铸坯,经热轧-固溶-冷轧-时效工序制备了厚1.5 mm的带材,研究了Ti元素添加和时效处理对试验合金的影响。结果表明,相比于Cu-Cr二元合金,Cu-Cr-Ti合金不但能够保持较高的导电性能,Ti元素的添加显著加快了Cu-Cr合金时效硬化响应速度,明显提高了合金的时效硬化效果,峰值时效(400℃×8 h)态Cu-Cr-Ti合金的维氏硬度125 HV,抗拉强度517 MPa,对应的电导率71.2%IACS;此外,通过导电率与析出相体积分数关系的分析,确定了不同温度下时效的相变动力学Avrami经验方程和电导率方程,并绘制了两种合金的TTT曲线。Cu-Cr and Cu-Cr-Ti alloys were prepared by atmosphere melted method. The process consisted of hot rolling, solid solution, cold rolling and aging treatment was subsequently carried out to prepare the s^p with the thickness of 1.5mam. The effects of Ti addition combined with aging process on the experimental alloys were investigated. The results show that, compared with Cu-Cr alloy, the electrical conductivity of Cu-Cr-Ti alloy maintaines high lever, while the addition of Ti element accelerates the hardening response of Cu-Cr alloy and increases the age hardening effect. The microhardness, electrical conductivity and tensile strength of the Cu-Cr-Ti alloy after aging at 400℃ for 8 h are enhanced to 125 HV, 71.2% IACS and 517 MPa, respectively. Furthermore, the Avrami equation of phase transformation kinetics and the electrical conductivity equation are obtained, and the time-temperature-transformation kinetics curves are drawn through the analysis of the relationship between electrical conductivity and volume fraction of precipitates at last.

关 键 词：Cu-Cr-Ti合金 时效动力学 导电率 

分 类 号：TG156.9[金属学及工艺—热处理]