万明攀,曾玉金,谭元标,黄朝文,赵永庆.等温条件下Ti-1300合金亚稳β相的分解动力学[J].稀有金属材料与工程,2019,48(12):3855~3862.[Wan Mingpan,Zeng Yujin,Tan Yuanbiao,Huang Chaowen,Zhao Yongqing.Decomposition Kinetics of Metastable β Phase in Ti-1300 Alloy under Isothermal Conditions[J].Rare Metal Materials and Engineering,2019,48(12):3855~3862.]
等温条件下Ti-1300合金亚稳β相的分解动力学
投稿时间:2018-06-26  修订日期:2018-07-26
中文关键词:  分解动力学  相变机制  Ti-1300合金  TTT曲线
基金项目:国家自然科学基金项目(青年基金)
中文摘要:
      通过高精度膨胀法研究了固溶态Ti-1300合金在400~700℃等温条件下相变动力学。研究表明:固溶态Ti-1300合金中亚稳β相的分解动力学可用Johnson-Mehl-Avrami(JMA)方程表征,并获得400~700℃温度范围内JMA方程的特征参数K和n,一定程度上反映了合金中亚稳β相的分解机制。当Ti-1300合金在400~420℃时效时,亚稳β相的分解方式主要为βm→β′+β→α+β;当合金在500 ~700℃时效时,亚稳β相的分解方式主要为βm→α+β;同时在等温条件下,时效初期α相的形核率较快,且含量迅速增加,后期达到一定量后保持稳定。根据计算和试验结果,得到了Ti-1300合金在500 ~700℃等温条件下亚稳β相的分解的TTT曲线,鼻尖温度约为600℃。
Decomposition Kinetics of Metastable β Phase in Ti-1300 Alloy under Isothermal Conditions
英文关键词:Decomposition kinetics  mechanism of phase transformation  Ti-1300 alloy  TTT diagram
英文摘要:
      Phase transformation kinetics of Ti-1300 alloy after solution treatment were investigated under isothermal conditions in the temperature range of 400 to 700℃ by using dilatometric method. The decomposition kinetic equation of metastable β phase in the alloy was constructed under isothermal conditions by analyzing the experimental data in the theoretical frame of the Johnson-Mehl-Avrami theory. The different values of k and n parameters were obtained in the temperature range of 400 to 420℃ and 500 to 700℃, indicating that the mechanism of the phase transformation was different in different temperature ranges. The decomposition mechanism of metastable β phase is βm→β′+β→α+β at the temperature of 400 to 420℃, whereas the decomposition mechanism of metastable β phase is βm→α+β at the temperature of 500 to 700℃. When the metastable β phase of Ti-1300 alloy was annealed isothermally at a given temperature, the amount of α phase increased firstly, and then reached a stable value with increasing the holding time. Based on calculation and experimental results, time-temperature-transformation diagrams (TTT diagram) of Ti-1300 alloys were plotted for the metastable β phase decomposition under isothermal conditions from 500 to 700℃. And the nose temperature of the TTT diagram of the alloy is around 600℃ for the Ti-1300 alloys.
作者单位E-mail
万明攀 贵州大学 材料与冶金学院 mpwan@gzu.edu.cn 
曾玉金 贵州大学 材料与冶金学院  
谭元标 贵州大学 材料与冶金学院  
黄朝文 贵州大学 材料与冶金学院  
赵永庆 西北有色金属研究院  
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