9Cr-ODS钢在高温铁离子辐射下的纳米粒子稳定性和微观结构演变
Yaxia Wei1, Wei Qian1, Pengfei Zheng1
1Center for Fusion Science, Southwest Institute of Physics, No. 5, Huangjing Road, Chengdu 610225, China.
Materials (Basel, Switzerland)
|January 28, 2026
概括
在ODS钢中Y-Ti-O纳米粒子 (NP) 的稳定性取决于辐射温度. 较高的温度 (650°C) 抑制了粗化,而较低的温度 (350-500°C) 促进了粗化,影响了微观结构和使用寿命.
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.
- 纳米技术 纳米技术
背景情况:
- 纳米粒子 (NP) 稳定性对于氧化物分散增强 (ODS) 钢的长期性能至关重要.
- 了解辐射下的NP行为对于先进的材料应用是必不可少的.
研究的目的:
- 在铁离子辐射下研究9Cr-ODS钢中Y-Ti-O NP的稳定性和粗化动力学.
- 为了将NP微结构演变与辐射深度和温度相关联.
- 分析辐射引起的缺陷的形成和元素分离.
主要方法:
- 9Cr-ODS钢样品用3.5 MeV Fe13+离子在350至650°C的温度下辐射至20dpa.
- 使用传输电子显微镜 (TEM) 进行微结构分析.
- 研究NP粗化速率与辐射深度之间的关系.
主要成果:
- 精细的Y-Ti-O NPs在350和500°C时粗,粗速度在特定深度达到峰值,随温度增加而增加.
- 在650°C时,NP粗显著抑制,观察到的变化很小.
- 排位环 (b=1/2<111>在350°C,b=<100>在500°C) 和排位线 (在650°C) 形成,与表面的元素分离一起.
结论:
- 辐射温度强烈影响ODS钢中的Y-Ti-O NP稳定性,650°C促进了稳定性.
- 观察到的粗化动力学和缺陷演变为我们提供了关于在辐射下材料降解机制的见解.
- 表面效应有助于辐射层内的元素再分配.
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