Cu-0.33Cr-0.05Ti 合金时效相变动力学

Kinetics of phase transformation of aged Cu-0.33Cr-0.5Ti alloy

摘要:

通过中频感应熔炼制备了 Cu-0.33Cr-0.05Ti 合金铸锭,铸锭经热挤压、固溶、冷拔和中间退火工序制备成直径2.1 mm 的线材,对合金线材进行时效处理,研究时效处理对合金导电率的影响并对该合金的时效动力学进行了分析.结果表明：Cu-0.33Cr-0.05Ti 合金在400℃×2 h 可获得较高的导电率,导电率为83.13，IACS,随保温时间的延长,合金的导电率变化趋于平缓.根据马基申-富列明格规律和Avrami 经验方程计算得到 Cu-0.33Cr-0.05Ti 合金在350,400及450℃的 Avrami 方程分别为f =1-exp(-0.0199t 1.0555),f =1-exp(-0.0578t 0.8632)和 f =1- exp(-0.0613t 0.7724),并得到了合金时效时的等温脱溶转变曲线.

Abstract:

Cu-0.33Cr-0.05Ti alloy was prepared by atmosphere melted method.The process consists of hot extrusion,solid solution,cold drawing and intermediate annealing was subsequently carried out to prepare the wire rod with the diameter of Φ2.1 mm.The effect of aging treatment on electrical conductivity of Cu-0.33Cr-0.05Ti alloy is investigated.The precipitation kinetics of the alloy is also analyzed.The result shows that,the electrical conductivity of Cu-0.33Cr-0.05Ti alloy reached 83.13， IACS after aging at 400℃ for 2 h.With the increase of aging time,the value of electrical conductivity kept unchanging. According to the Matthiessen rule and phase transition dynamics Avrami conductivity equation, the Avrami experimental equations of Cu-0.33Cr-0.05Ti alloy at 350,400,450 ℃ was calculated,which were f =1-exp(-0.01 99t 1.05 5 5 ),f =1 - exp(-0.0578t 0.86 32 ),and f = 1 - exp(-0.0613t 0.7 724 ),respectively. The isothermal transformation curves were obtained at last.