Citation: YAN Shun-Ping, YU Yong, WANG Hu-Yi, ZHAO Feng-Peng. Static Constitutive Model of Aged δ-Pu Based on Evolution of Helium Bubbles and Dislocation Density[J]. Acta Physico-Chimica Sinica, ;2015, 31(S1): 59-63. doi: 10.3866/PKU.WHXB2014Ac07 shu

Static Constitutive Model of Aged δ-Pu Based on Evolution of Helium Bubbles and Dislocation Density

1.
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China

Corresponding author: YU Yong,
Fund Project: 国家自然科学基金(11302209)与国家自然科学基金委员会和中国工程物理研究院联合基金(U1330121)资助项目 (11302209)与国家自然科学基金委员会和中国工程物理研究院联合基金(U1330121)

The α radioactive decay of Pu by self-irradiation in the δ-Pu alloy markedly changes its microstructure and macro mechanical properties. Helium bubbles, the main product of self-irradiation, can affect the plastic behavior of δ-Pu by impeding the movement of dislocations. In this paper, we first derive a relationship between the volume ratio of helium bubbles and aged time. We then introduce the effect of helium bubbles on the critical resolved shear stress for dislocation motion and the growth law for helium bubbles into a constitutive model to obtain the dislocation-based static constitutive functions of δ-Pu. Model parameters are then fitted using experiment data. Finally, the stress-strain curves of δ-Pu for different aged times are presented.
- δ-Pu,
- Self-irradiation,
- Helium bubble,
- Constitutive model
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沈阳化工大学材料科学与工程学院沈阳 110142