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高合金中老化诱导的柔性-脆性-柔性过渡及其影响
Qianning Dai1,2,3, Chenzhi Xing2, Bijun Xie1,3,4
1Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 27, 2025
概括
高合金 (HEAs) 意外地显示出柔性-脆性-柔性过渡,这是由于局部化学秩序和相位边界的演变,而不是粒度边界. 这一发现挑战了先进材料的传统脆性理论.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 物理化学 物理化学
背景情况:
- 温度脆化是常规合金中已知的现象,导致显著的延展性损失.
- 在高合金 (HEA) 系统中没有观察到这种效应,HEA系统通常具有抗脆性.
- 了解HEA的热行为对于它们作为高温结构材料的应用至关重要.
研究的目的:
- 为了研究在多相高合金中观察到的意想不到的柔性-脆性-柔性过渡.
- 阐明负责这种过渡的潜在机制,将其与经典气脆化区分开来.
- 为设计和处理HEA提供洞察力,以提高高温性能.
主要方法:
- 多相高合金在特定温度调节下进行实验老化.
- 微结构分析以观察局部化学顺序 (LCO) 和相界 (PB) 配置的变化.
- 机械测试用于评估柔性,并确定柔性-脆性-柔性过渡.
主要成果:
- 在老化时在HEA发现了一个意想不到的柔性-脆性-柔性过渡.
- 过渡与LCO和PBs的动态演变有关,而不是谷物边界效应.
- 在易碎的模式下老化增加了LCO,并诱导了状PBs,导致易碎.
- 在这种制度之外的衰老促进了柔性相间过渡区,导致柔性恢复.
结论:
- 这项研究揭示了一种由化学排序和相位边界演变驱动的HEAs热脆化的新机制.
- 这一发现挑战了人们对气脆弱的既定理解,以及它在HEA中缺乏的理解.
- 结果为开发用于要求高结构应用的先进HEA提供了关键指导.
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