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格子扭曲和重新扭曲会影响高合金中的辐射耐受性

Peng-Wei Wang¹, Ming-Fei Li¹, Babafemi Malomo²

¹College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.R. China. yangliang@nuaa.edu.cn.

|October 4, 2023

概括

高合金 (HEAs) 通过减少永久性缺陷和增强结构恢复,表现出优越的辐射耐受性. 高温电池中的晶格扭曲是它们自我修复能力的关键,使其能够开发耐辐射材料.

科学领域:

材料科学材料科学材料科学
核工程核工程是指核工程.
计算材料科学科学计算材料科学

背景情况:

高合金 (HEAs) 由于其固有的耐辐射性,因此被认为具有作为核结构材料的潜力.
在高温射中辐射耐受性背后的精确机制尚未完全理解,需要进一步研究.

研究的目的:

在各种HEA模型中研究辐射诱导的纳米微结构的演化.
阐明某些高温电站中观察到的较高辐射耐受性的基本机制.

主要方法:

利用分子动力学模拟来建模Ni,FeNiCr,FeNiCrCoCu和FeNiCrCuAl HEA模型在辐射下的行为.
分析了辐射引起的缺陷的形成和消灭,特别是弗伦克尔对 (FP).

主要成果:

在FeNiCrCuAl HEA模型中,残留Frenkel对较少,这表明它对永久缺陷产生有很高的抵抗力.
由于长时间的热峰和缓慢的再结晶,观察到FP的高效重组/消灭,从而导致更好的结构恢复.
高温原子的复杂性增加导致了显著的晶格扭曲,减少了原子的移动性,并抑制了脱位形成.

结论:

高的优越辐射耐受性归因于它们的自我愈合和恢复能力,由格子扭曲驱动.
该FeNiCrCuAl HEA模型显示了最高的格子扭曲和最小的再扭曲,证实了其强大的自我愈合机制.
增强晶体材料,特别是高电压材料的晶格扭曲是一种可行的策略,用于开发先进的,耐辐射的结构材料.

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