Citation: LI Rui-Wen, WANG Xiao-Lin, SHI Peng, JI He-Fei. Study on Strain Energy on the Hydride Growth Kinetics of U-Nb Alloys[J]. Acta Physico-Chimica Sinica, ;2015, 31(S1): 39-44. doi: 10.3866/PKU.WHXB2014Ac14 shu

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

1.
1 Institute of Material, China Academy of Engineering Physics, Mianyang 621700, Sichuan Province, P. R. China;
2.
2 China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China

Corresponding author: LI Rui-Wen,
Fund Project: 中国工程物理研究院发展基金(2011B0301056)资助项目 (2011B0301056)

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.
- U-Nb alloy,
- Hydride,
- Strain energy,
- Growth model
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