摘要
采用固溶+冷变形+不同直流电流密度下的时效工艺制备了Cu-0.33Cr-0.06Zr(质量分数,下同)合金试样。进行了450℃下不同时效时间及不同电流密度的时效试验,研究了时效电流和时间对Cu-0.33Cr-0.06Zr合金导电性能的影响。采用透射电镜观察时效合金组织,探讨了不同电流密度下该合金的时效析出动力学。结果表明,合金在电流密度为100A/cm2的直流电流下时效,电导率低于无电流时效的;而在电流密度为400 A/cm2下时效2h后,电导率达到49.5MS/m,接近峰值,高于无电流时效的。时效后合金析出Cr相和CuZr3相,通过对电导率与析出相体积分数关系的分析,确定了合金在不同温度下时效的相变动力学Avrami经验方程和电导率方程。
Cu-0. 33Cr-0.06Zr alloy was prepared in the process of solid solution, cold deformation and aged under DC with different current densities. Different DC densities were imposed with aging at 450 ℃ for different time to understand influence of aged time and different current densities on electrical prop- erties of Cu-0.33Cr-0.06Zr alloy. The morphology of crecipitation phase was observed by means of high resolution transmission electron microscope, and the aging kinetics of the alloy was described. The re- sults show that in contrast with those of the alloy aged without DC, the electric conductivity of the alloy aged with 100 A/cm current is the lower, while the alloy aged with 300.400 A/cm2 current is the higher than aged one without DC. With 400 A/cm2 DC, the electrical conductivity of alloy with aging for 2 hours is increased to 49.5 MS/m, ：approaching the peak value. Cr and CuZr3 precipitates in the alloy aged can be observed. The Avrami equation of phase transformation kinetics and the electrical conductiv- ity equation are derived through the analysis of the relationship between electrical conductivity and vol- ume fraction of precipitates.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2014年第11期1123-1126,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51345011)
河南省杰出人才基金资助项目(134200510011)
河南省科技攻关资助项目(112102210177)
教育部创新团队发展计划资助项目(ITR1234)
广东省教育部产学研结合资助项目(2012B091100038)
广州市产学研结合专项资金资助项目(122700016)
