物理化学学报 >> 2015, Vol. 31 >> Issue (Suppl): 39-44.doi: 10.3866/PKU.WHXB2014Ac14

研究论文 上一篇    下一篇

U-Nb合金氢化物生长动力学的应变能研究

李瑞文1, 汪小琳2, 史鹏1, 纪和菲1   

  1. 1 中国工程物理研究院材料研究所, 四川绵阳621700;
    2 中国工程物理研究院, 四川绵阳621900
  • 发布日期:2015-05-20
  • 通讯作者: 李瑞文 E-mail:ruiwenli@163.com
  • 基金资助:

    中国工程物理研究院发展基金(2011B0301056)资助项目

Study on Strain Energy on the Hydride Growth Kinetics of U-Nb Alloys

LI Rui-Wen1, WANG Xiao-Lin2, SHI Peng1, JI He-Fei1   

  1. 1 Institute of Material, China Academy of Engineering Physics, Mianyang 621700, Sichuan Province, P. R. China;
    2 China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China
  • Published:2015-05-20
  • Contact: LI Rui-Wen E-mail:ruiwenli@163.com
  • Supported by:

    The project was supported by the Development Fund of China Academy of Engineering Physics (2011B0301056).

摘要:

为研究不同铀铌合金(U, U-25%Nb, U-57%Nb (质量分数))的氢化表现行为以及合金元素铌在氢化过程的作用规律和机制, 以应变能理论为基础, 对3 种合金表面氢化物生长进行模拟研究, 获得了氢化物生长过程中的应力、应变和应变能演变, 发现3种材料在氢化物生长过程的应变能存在明显差异. 3种材料表面形成铀氢化物需克服的应变能顺序为: U-5.7%Nb > U > U-2.5%Nb. 结合化学反应活化能理论, 获得3 种材料的氢腐蚀倾向性顺序为: U-2.5%Nb > U > U-5.7%Nb. 应变能模拟结果与3 种材料氢化腐蚀动力学实验一致, 说明了氢化物生长的应变能模型的正确性, 证实了氢化物形成时由于体积变化大, 导致了巨大应变能形成, 直接影响了铀氢化物的形成动力学.

关键词: U-Nb合金, 氢化物, 应变能, 生长模拟

Abstract:

To investigate the difference of the hydride growth kinetics of U, U-2.5%Nb, and U-5.7%Nb (mass fraction) based on strain energy theory, the deformation, stress, and strain energy during hydride growth were investigated by the finite element model (FEM) according to the mechanical properties of the three U materials. The results showed that the strain energy because of hydride expansile growth in the matrix is considerably different for the three U materials. When hydride grows, the order of the strain energy value is U-5.7%Nb > U > U-2.5%Nb. This indicates that based on reaction activation energy theory the U-2.5%Nb alloy is the most susceptible to hydrogen corrosion, followed by U, while U-5.7%Nb is the most resistant to hydrogen corrosion. The calculated results of the strain energy agree with the hydride growth kinetics experimental results, which also show that the hydride growth model is correct. This study shows that the large strain energy because volume change during hydride growth plays an important role in the growth kinetics.

Key words: U-Nb alloy, Hydride, Strain energy, Growth model

MSC2000: 

  • O643