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辐照诱导级联混合对U-Nb和U-Zr合金中旋节分解的影响：相场研究

Effect of irradiation-induced cascade mixing on spinodal decomposition in U-Nb and U-Zr alloys: a phase field study.

作者信息

Lu Yong, Guo Honghao, Gong Hengfeng, Jiang Zheng, Huang Xiaoyi, Liu Xingjun, Wang Cuiping

机构信息

College of Materials, Fujian Provincial Key Laboratory of Materials Genome, Xiamen University Xiamen 361005 PR China

Nuclear Fuel and Materials Department, China Nuclear Power Technology Research Institute Co., Ltd Shenzhen 518000 PR China.

出版信息

RSC Adv. 2021 Nov 23;11(59):37612-37623. doi: 10.1039/d1ra07324a. eCollection 2021 Nov 17.

DOI:10.1039/d1ra07324a
PMID:35496409
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9044010/
Abstract

The spinodal decomposition of the γ-phase in U-Nb and U-Zr alloys under irradiation was investigated using the phase-field method coupled with micro-elasticity theory and rate dependent cascade mixing model. Microstructure evolutions of spinodal decomposition in U-Nb and U-Zr alloys were simulated by considering different initial compositions and dose rates. The volume fraction and composition distribution under different cascade mixing were presented. The simulation results show that the volume fractions and equilibrium composition of the (Nb,Zr)-rich γ-phase and the rate of spinodal decomposition are influenced by the dose rate and initial alloy composition. The cascade mixing can drive Nb or Zr atoms back into solution until a new equilibrium state between local cascade mixing and spinodal decomposition is reached. The evolution analysis indicated that irradiation-induced cascade mixing acts in opposition to thermodynamically driven spontaneous spinodal decomposition, which can not only slow down the spinodal decomposition but also reduces the composition range of the miscibility gap.

摘要

采用相场法结合微观弹性理论和速率依赖级联混合模型，研究了U-Nb和U-Zr合金中γ相在辐照下的亚稳分解。通过考虑不同的初始成分和剂量率，模拟了U-Nb和U-Zr合金中亚稳分解的微观结构演变。给出了不同级联混合下的体积分数和成分分布。模拟结果表明，富（Nb，Zr）γ相的体积分数和平衡成分以及亚稳分解速率受剂量率和初始合金成分的影响。级联混合可以使Nb或Zr原子重新回到固溶体中，直到局部级联混合和亚稳分解之间达到新的平衡状态。演化分析表明，辐照诱导的级联混合与热力学驱动的自发亚稳分解相反，它不仅会减缓亚稳分解，还会减小混溶间隙的成分范围。

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引用本文的文献

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本文引用的文献

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Vacancy and interstitial atom evolution with the separation of the nanoscale phase in Fe-Cr alloys: phase-field simulations.铁铬合金中纳米级相分离时的空位和间隙原子演化：相场模拟
Phys Chem Chem Phys. 2020 Feb 14;22(6):3611-3619. doi: 10.1039/c9cp06247e. Epub 2020 Jan 29.
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Nat Commun. 2018 Mar 14;9(1):1084. doi: 10.1038/s41467-018-03415-5.
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Compositional patterning in systems driven by competing dynamics Of different length scale.
由不同长度尺度的竞争动力学驱动的系统中的组成模式。
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