耐火高合金中老化软化的起源
Junliang Liu1,2, Bo-Shiuan Li1,3, Hazel Gardner1,4
1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
Science advances
|December 8, 2023
概括
耐火高合金 (RHEAs) 中的氧和等杂质在高温老化过程中导致相分离和软化. 控制这些微量间歇物对于RHEA的开发和应用至关重要.
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:
- 耐火高合金 (RHEAs) 由于其独特的特性,对极端环境有很大的希望.
- 在高温下RHEAs的长期稳定性和微观结构演变需要进一步研究.
研究的目的:
- 研究Ti-V-Nb-Ta合金在700°C老化后的微观结构和机械性能演变.
- 了解微量间位物在耐火高合金的稳定性和性能中的作用.
主要方法:
- 先进的分析显微镜.
- 阶段图的计算 (CALPHAD) 软件
- 纳米印花的使用方法
主要成果:
- 在700°C的老化诱导了相分离,由微量间位物 (氧,) 驱动.
- 这些间位物最初加强了合金,在热老化过程中促进了不稳定性.
- 随着金属基质中溶解物间位物耗尽,观察到逐渐软化.
结论:
- 微量间位杂质对耐火高合金的长期稳定性产生重大影响.
- 精确控制杂质水平对于优化RHEAs的性能和应用至关重要.
- 这项研究强调了对未来耐火高合金发展的关键考虑.
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