添加微量钛对Cu-Cr合金组织与性能的影响  

Effect of Trace Ti Addition on Microstructure and Mechanical Properties of Cu-Cr Alloy

作　　者：刘耀[1,2] 张建波[3,2] 李勇[3,2] 胡美俊 陈婷婷[1,2] 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000 [2]江西省有色金属加工工程技术研究中心,江西赣州341000 [3]江西理工大学工程研究院,江西赣州341000

出　　处：《有色金属工程》2016年第2期14-22,共9页Nonferrous Metals Engineering

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

摘　　要：采用大气熔炼制备0.11Ti和0.21Ti含量Cu-Cr-Ti合金铸坯,经热轧—固溶—冷轧—时效工序制备带材,研究钛添加量和热处理工艺对合金性能和组织的影响。结果表明,采用400℃、8 h时效工艺,Cu-0.55Cr-0.11Ti合金具有较好的综合性能,硬度、电导率和抗拉强度分别为125 HV1、72.3%IACS和517 MPa,采用450℃、4 h时效工艺,Cu-0.48Cr-0.21Ti合金具有较好的综合性能,合金硬度、电导率和抗拉强度分别为126 HV1、52.3%IACS和523 MPa。时效态两种合金在500℃保温1 h硬度仍高于初始硬度85%。钛含量提高对时效态Cu-Cr合金的导电性能影响显著,钛含量从0.11%提高至0.21%,峰值时效态合金的电导率降低28.4%,钛含量对合金硬度和强度的影响不大。铬在Cu-Cr-Ti合金中的主要存在形式为第二相粒子,钛的主要存在形式为溶质原子,立方相的形成是合金高温性能提高的主要原因。The casting blanks of the Cu-Cr-Ti alloys are prepared by atmosphere melted method,and the strips are made by the hot rolling,solid solution,cold rolling and aging treatment. The effects of Ti addition and the heat treatment process on the experimental alloys are investigated. The results show that the peak hardness,electrical conductivity and tensile strength of Cu-0. 55Cr-0. 11 Ti alloy after aging treatment at 400 ℃ for 8 h are enhanced to 125 HV1,72. 3% IACS and 517 MPa,respectively. The peak hardness, electrical conductivity and tensile strength of Cu-0. 48Cr-0. 21 Ti alloy after aging treatment at 450 ℃ for 4 h are enhanced to 126 HV1,52. 3% IACS and 523 MPa,respectively. The decrease of the hardness of Cu-0. 55Cr-0. 11 Ti alloy and Cu-0. 48Cr-0. 21 Ti alloy after heat treatment at500 ℃ for 1 h is less than 15%. Trace Ti addition has significant influence on the conductivity of Cu-Cr alloy： the content of Ti is increased by 0. 1%; the conductivity of the alloy is decreased by about28. 4%,the addition of Ti has little influence on the hardness of Cu-Cr alloy. Cr is mainly the second phase and Ti is solute atom in Cu-Cr-Ti alloy. The formation of the rectangle phase is the mainly reason for enhancing the high-temperature property.

关 键 词：CU-CR合金 电导率 机械性能 微观组织 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG113.12[金属学及工艺—金属材料]