冷却速率和对 (CoCrCuTi) 100-xFex高合金微结构演变和机械性能的影响
Brittney Terry1, Reza Abbaschian2
1Department of Electrical and Computer Engineering (Materials Science and Engineering Program), University of California, Riverside, CA 92521, USA.
Entropy (Basel, Switzerland)
|October 25, 2024
概括
该研究探讨了冷却速度和铁含量如何影响高合金. 较高的铁含量和特定的冷却速率提高了这些先进材料的硬度和断裂性.
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.
- 固态化学 固态化学
背景情况:
- 高合金 (HEAs) 提供可调节的特性.
- 了解相位形成对于优化HEA性能至关重要.
研究的目的:
- 研究冷却速率和铁 (Fe) 含量对 (CoCrCuTi) 100-x Fex HEAs的相位形成和性能的影响.
- 确定增强机械性能的最佳条件.
主要方法:
- 通过弧形化和电磁悬浮合成的HEAs.
- 通过Cu chill或V形Cu模具控制冷却速度.
- 使用树手臂间距 (DAS) 量化冷却速度.
主要成果:
- 添加Fe (5-10%) 引入了C14 Laves阶段,并改变了FCC阶段分布.
- 液相分离 (LPS) 在10%的Fe合金中观察到低于75K/s,在12.5-15%的Fe合金中观察到任何速率.
- 较高的冷却速度 (400-700 K/s) 促进了树突式微观结构.
- 最大硬度 (891 HV) 和断裂性 (5.5 ± 0.4 KIC) 通过在25-75 K/s时使用15%的Fe实现.
结论:
- 冷却速度和Fe含量显著影响相位演变和微观结构.
- 优化的Fe含量和冷却速率在HEAs中产生了优越的硬度和破裂性.
- 结果为设计具有定制机械性能的先进HEA提供了洞察力.
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