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arXiv 2407.10002cond-mat.mtrl-sci
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辐照先进Fe-9Cr钢中MX析出相行为:自离子辐照对相稳定性的影响

MX precipitate behavior in an irradiated advanced Fe-9Cr steel: Self-ion irradiation effects on phase stability

T. M. Kelsy Green, Tim Graening, Weicheng Zhong, Ying Yang, Kevin G. Field

AI总结:

本研究针对聚变堆用先进Fe-9Cr低活化铁素体/马氏体钢,探究不同温度和损伤水平下自离子辐照对MX-TiC析出相稳定性的影响,揭示其温度主导的响应规律并结合模型分析机制,为优化高抗辐照钢种提供依据。

摘要:

低活化铁素体/马氏体(RAFM)钢是聚变堆第一壁和包层部件的首选候选结构材料。本工作是系统梳理RAFM钢中MX析出相在各类离子辐照条件下稳定性的系列研究的首篇。本文评估了一种先进Fe-9Cr RAFM钢中的MX-TiC析出相在自离子辐照下的行为,辐照损伤水平为1至100每原子位移(dpa),温度范围为300-600°C,以分离温度和损伤水平对析出相稳定性的影响。研究表明,预先存在的MX-TiC析出相表现出以温度为主导的响应:在15 dpa的损伤水平下,400°C以上会发生粗化;而在50 dpa及更高的损伤水平下,所有研究温度范围内均出现溶解。借助析出相稳定性的反冲分辨率模型,本文概述了弹道溶解和扩散对析出相行为的影响,该影响与析出相特征(数密度、尺寸和25%体积分数)及辐照参数相关。本工作为MX-TiC在高剂量下的稳定性提供了关键见解,以进一步优化具有更高抗辐照性能的先进钢种。

英文摘要:

Reduced activation ferritic/martensitic (RAFM) steels are the leading candidate structural materials for first-wall and blanket components in fusion reactors. This work is the first in a series to provide a systematic roadmap of MX precipitate stability in RAFM steels under various ion irradiation conditions. Here, the MX-TiC precipitate behavior in an advanced Fe-9Cr RAFM steel is assessed under self-ion irradiation to damage levels ranging from 1 to 100 displacements per atom (dpa) at temperatures ranging from 300-600°C to isolate the effects of temperature and damage level on precipitate stability. The pre-existing MX-TiC precipitates are shown to exhibit temperature-dominated responses, including coarsening above 400°C at damage levels of 15 dpa, while damage levels studied at 50 dpa and higher showed dissolution across all temperature ranges studied. The effects of ballistic dissolution and diffusion on precipitate behavior are outlined as a function of precipitate characteristics (number density, size, and 25 volume fraction) and irradiation parameters with the use of the recoil resolution model of precipitate stability. This work provides critical insights into MX-TiC stability to high dose in-order to further optimize advanced steels with improved radiation resistance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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