摘要
通过测量电导率研究了Cu-Cr合金450℃的相变动力学。利用电导率与新相析出量之间的关系计算新相析出体积分数,推导出450℃下的Avrami经验方程和电导率方程。在此基础上作450℃时效时的相变动力学＂S＂曲线。并用固溶体脱溶分解反应机理的积分方程验证Avrami经验方程的正确性。通过同样的方法计算出420~600℃的n和b值,并利用Cu-Cr合金在不同温度下的n和b值作Cu-Cr合金等温转变动力学＂C＂曲线。450℃×1 h时效Cu-Cr合金主要为GP区,450℃×8 h时效Cu-Cr合金主要析出相为具有cube-on-cube位向关系的有序fcc富Cr相。
Plase transformation kinetics of Cu-Cr alloy was calculated in terms of analyzing the electrical conductivity at450 ℃.The Avrami-equation of phase transformation kinetics and the Avrami-equation of electric conductivity during aging were derived from relationship between the conductivity and the precipitations.On this basis,phase transformation kinetics curves of alloy at 450 ℃ were made.Then,the Avrami formulation for describing the kinetics of the phase transformation was proved to be correct by integral functions of the reactive mechanism of thermal decomposition of solid solution.Value of n and b at 450 ℃-600 ℃ were calculated by the same method.Using n and b values at different temperatures thermal transformation C-curves of Cu-Cr alloy were made.The precipitates are GP zone while aging at 450 ℃ for 1 h.The precipitates are ordered fcc Cr-rich phase with orientation relationship of cube-on-cube while aging at 450 ℃ for 8 h.
出处
《热加工工艺》
CSCD
北大核心
2015年第10期226-229,235,共5页
Hot Working Technology
基金
国家自然基金资助项目(51161018)
关键词
CU-CR合金
电导率
时效
相变动力学
反应机理
Cu-Cr alloy
electrical conductivity
aging
phase transformation kinetics
reaction mechanism
