一种复杂的缩合金,在77K时具有创纪录的高强度性
Yasir Sohail1, Chongle Zhang1, Shaohua Gao1
1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|December 5, 2024
概括
一种新的FeCoNiAlTa合金在低温温度下表现出异常强度和可塑性. 这种先进的材料实现了创纪录的高性,性能优于现有的冷合金和高合金.
科学领域:
- 材料科学 材料科学 材料科学
- 金工程 金工程 金工程
- 机械工程 机械工程
背景情况:
- 低温应用需要具有高强度和可塑性的合金,以获得优越的材料性.
- 传统的合金在低温下经常表现出脆性,限制了它们的使用.
- 开发具有增强冷性能的先进材料至关重要.
研究的目的:
- 为冷应用设计一种具有增强机械性能的新型复杂缩合金.
- 研究设计合金在77K的强化和变形机制.
- 在低温合金中实现创纪录的高材料性.
主要方法:
- 对于合金设计而言,基于领域知识的机器学习.
- 在FCC矩阵中制造Fe35Co29Ni24Al10Ta2合金与L12纳米沉物.
- 在77K的拉力测试中评估机械性能和相变 (FCC-to-BCC).
主要成果:
- 这种Fe35Co29Ni24Al10Ta2合金实现了约1.4GPa的屈服强度和约2.25GPa的最终抗拉强度.
- 观察到大约45%的均延长,有助于高材料性.
- 与其他转换不同的是,FCC-to-BCC相位转换在77K时没有诱导脆性.
- 纳米沉物在冷温度下促进了强化,延展性和变形生.
结论:
- 设计的FeCoNiAlTa合金表现出卓越的冷机械性能,包括创纪录的高性.
- 纳米沉物的整合,位相互作用和稳定的相变化是实现这些特性的关键.
- 这项研究为开发适用于极端环境的先进合金提供了一条途径.
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