摘要
分析了时效温度（400~550 ℃）和时效时间（0~8 h）对铜镍硅锌镁合金导电率的影响，推导了导电率和新相析出率之间的关系，在此基础上，根据Avrami相变动力学经验方程推导出了试验合金在400~550 ℃时效时的相变动力学方程和导电率方程，并计算出该合金在不同温度下时效时的相变开始和结束时间。结果表明：在时效初期，试验合金的导电率迅速上升，之后趋于平缓；温度越高，时效相同时间后的导电率越高；导电率和新相析出率之间存在线性关系，可以用导电率的变化来间接反映相变过程；根据导电率方程计算得到的导电率与试验结果吻合；试验合金在500 ℃时效时的相变开始时间和结束时间最短，分别为0.34，7 083.23 s。
The effects of aging temperature （400--550℃） and aging time（0--8 h） on electrical conductivity of Cu-Ni-Si-Zn-Mg alloy were analyzed. The relationship between electrical conductivity and precipitation rate of new phases was deduced, the phase transformation kinetics equation and electrical conductivity equation for tested alloy aging from 400℃ to 550℃ were determined according to Avrami phase transformation kinetics empirical formula, and the phase transformation beginning time and ending time for the alloy aging at different temperature were calculated on basis of the former achievements. The results show that electrical conductivity raised sharply in the beginning aging time, and then began to flatten. In addition, the higher aging temperature, the greater electrical conductivity when aging for the same time. The phase transformation process could be reflected by the change of electrical conductivity because of linear relationship between electrical conductivity and precipitation rate of new phases. It can be seen that the results obtained by the electrical conductivity equation are in good coincidence with the experimental results. The phase transformation beginning time and ending time for tested alloy aged at 500℃ were the shortest, and they were 0. 34, 7 083.23 s, respectively.
出处
《机械工程材料》
CAS
CSCD
北大核心
2014年第3期10-13,101,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51345011)
河南省杰出人才项目(134200510011)
长江学者和创新团队发展计划资助项目(IRT1234)
河南省高校科技创新团队支持计划(2012IRTSTHN008)
河南科技大学SRTP项目(2010006)
关键词
铜镍硅锌镁合金
导电率
时效时间
相变动力学方程
Cu-Ni-Si-Zn-Mqg alloy
electrical conductivity
aging time
phase transformation kinetics equation
作者简介
邓猛（1988-），男，河南南阳人，硕士研究生。
通讯作者（导师）：贾淑果教授
