Hardening due to dislocation loop damage in RPV model alloys: Role of Mn segregation

Hardening due to dislocation loop damage in RPV model alloys: Role of Mn segregation
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RPV 模型合金中位错环损伤引起的硬化:Mn 偏析的作用

DOI:
10.1016/j.jnucmat.2014.11.023
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发表时间:
2015-02
影响因子:
3.1
通讯作者:
贺新福
贺新福
中科院分区:
工程技术2区
文献类型:
--
作者:
贺新福

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造成反应堆压力容器钢在高剂量下硬化的辐射缺陷的确切性质尚未明确确定。虽然通常它是由于溶质丰富的集群(沉淀物)和点缺陷集群(基体损伤),最近的精细尺度实验和原子模拟表明,溶质丰富的集群,主要含有锰,镍和铜,可能是这些元素的偏析的结果小位错环(异质成核),使沉淀物和基体损伤之间的区别变得模糊。在这里,我们进行了原子的研究,调查的相互作用ofa 0/2<1 1 1>位错环与移动位错,并专门解决的溶质偏析的影响上的循环的强度和相互作用机制,特别是专注于锰,单独或与其他重要的溶质元素,如铜和镍。结果表明,Mn在位错环核心的富集使位错环的解钉扎应力显著增加,特别是对于细小的、不可见的位错环。同时,位错环处的溶质偏析增强了它们对移动位错吸收的抵抗力。
The exact nature of the radiation defects causing hardening in reactor vessel pressure steels at high doses is not yet clearly determined. While generally it is attributed to solute-rich clusters (precipitates) and point defects clusters (matrix damage), recent fine-scale experiments and atomistic simulations suggest that solute rich clusters, mainly containing Mn, Ni and Cu, might be the result of the segregation of these elements to small dislocation loops (heterogeneous nucleation), so that the distinction between precipitates and matrix damage becomes blurred. Here, we perform an atomistic study to investigate the interaction ofa0/2<1 1 1> dislocation loops with moving dislocations and specifically address the effect of solute segregation on the loop’s strength and interaction mechanism, focusing in particular on Mn, alone or with other crucial solute elements such as Cu and Ni. It is found that the enrichment of Mn in the core of dislocation loops causes significant increase of the unpinning stress, especially for small, invisible ones. At the same time, the solute segregation at the dislocation loops enhances their resistance against absorption by moving dislocations.
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影响因子: 1.6
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