The effect of Mn/Ni on thermodynamic properties of critical nucleus in Fe-Cu-Mn (Ni) ternary alloys

Li, Boyan; Zhang, Lei; Li, Chengliang; Li, Qiulin; Chen, Jun; Shu, Guogang; Weng, Yuqing; Xu, Ben; Hu, Shenyang; Liu, Wei

doi:10.1016/j.jnucmat.2018.04.018

Title: The effect of Mn/Ni on thermodynamic properties of critical nucleus in Fe-Cu-Mn (Ni) ternary alloys

Journal Article · Wed Apr 18 00:00:00 EDT 2018 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2018.04.018· OSTI ID:1434655

^[1]; Zhang, Lei ^[2]; Li, Chengliang ^[3]; Li, Qiulin ^[4]; Chen, Jun ^[3]; Shu, Guogang ^[3]; Weng, Yuqing ^[5]; Xu, Ben ^[1];

^[6]; Liu, Wei ^[1]

Tsinghua Univ., Beijing (China). Lab. of Advanced Materials and School of Materials Science and Engineering
Peking Univ., Beijing (China). Beijing International Center for Mathematical Research and Center for Quantitative Biology
China Nuclear Power Engineering Co., Ltd (CNPEC), Shenzhen (China)
Tsinghua Univ., Shenzhen (China). Graduate School at Shenzhen
China Iron and Steel Research Inst. Group (CISRI), Beijing (China)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

The aging- or radiation-induced hardening of Cu/Mn/Ni precipitates in Fe alloys is one of property degradation mechanisms in structural materials in nuclear reactors. Experiments show that aging or radiation leads the formation of Cu-rich precipitates, and the addition of Mn or Ni elements enhances the precipitation kinetics. In this study, the phase-field model coupled with the constrained string method have been applied to investigate the thermodynamic properties of critical nuclei such as the minimum energy path of Cu/Mn/Ni precipitation in Fe-Cu-Mn and Fe-Cu-Ni ternary alloys. The chemical free energies used in the model are taken from CALPHAD. The simulation results show that the formation of Cu/Mn/Ni clusters needs to overcome an energy barrier, and the precipitate has a Core-Shell structure. The thermodynamic properties of the critical nucleus are influenced by temperature and Cu/Mn/Ni overall concentrations, which are in accordance with the simulation results as well as the experimental observations.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; National Natural Science Foundation of China (NSFC); National Magnetic Confinement Fusion Science Program (China); China Nuclear Power Engineering Co., Ltd (CNPEC), Shenzhen (China); National Defense Science and Technology Univ., Tianjin (China)

Grant/Contract Number:: AC05-76RL01830; 51301094; 11622102; 11421110001; 51471092; 2013966003; AC06-76RL01830

OSTI ID:: 1434655

Journal Information:: Journal of Nuclear Materials, Vol. 507; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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