热稳定的异质颗粒耐火高合金提供优越的强度从77到973K
Yaqiong An1, Linze Li1, Wenxuan Li1
1Center for Alloy Innovation and Design, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
Nano letters
|October 14, 2025
概括
这项研究开发了一种具有稳定的异质微观结构的冷加工耐火高合金 (RHEA). 这种RHEA在广泛的温度范围内表现出极好的强度和可塑性,从冷到高温.
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.
- 机械工程 机械工程
背景情况:
- 耐火高合金 (RHEAs) 面临着在广泛的温度范围内平衡强度和可塑性的挑战.
- 开发具有从低温到高温一致的机械性能的RHEA对于先进的应用至关重要.
研究的目的:
- 设计一种可冷加工的NbTaTiHf基RHEA,具有热稳定的异质粒度结构.
- 为了在RHEAs中在广泛的温度谱 (77K到973K) 中实现强度-柔性平衡.
主要方法:
- 热力学处理被采用,以创建一个定制的,热稳定的异质粒状结构.
- 机械测试在77K至973K的温度下进行,以评估拉伸强度和柔性.
主要成果:
- 设计的RHEA表现出了卓越的机械性能,其抗拉强度在77K时超过1.8GPa,在973K时超过900MPa.
- 不同质的微观结构在高温下由于缩的耐火元素和缓慢的动力学而保持热稳定.
- 在所有测试的温度调节中,异形变形诱导 (HDI) 强化机制得到了有效的维持.
结论:
- 为下一代RHEAs制定了一个实用的设计策略,这些RHEAs具有优越的,广泛的温度机械性能.
- 热稳定的异质微结构是实现RHEAs中强度-柔性平衡的关键.
- 这项研究为开发适用于苛刻环境的先进RHEAs提供了一条途径.
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