结合CALPHAD方法和由率驱动的设计,开发一种先进的轻质高温Al-Ti-Ta合金
Gourav Mundhra1,2,3, Jien-Wei Yeh2,3, B S Murty1,4
1Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
Materials (Basel, Switzerland)
|November 9, 2024
概括
使用CALPHAD和驱动设计开发了一种新的轻量级-- (Al-Ti-Ta) 合金. 这种先进的合金表现出异常的硬度和热稳定性,在较低密度下表现优于常规材料.
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.
- 计算材料设计设计 计算材料设计
背景情况:
- 传统的合金往往缺乏要求高温性能和强度,以适用于苛刻的应用.
- 开发具有增强机械性能和热稳定的先进合金对于技术进步至关重要.
研究的目的:
- 开发一种具有优越硬度和热稳定的新型轻质Al-Ti-Ta合金.
- 调查结合CALPHAD方法与驱动设计用于合金开发的有效性.
主要方法:
- 构成优化的CALPHAD (阶段图计算) 方法.
- 用率驱动的设计原则来实现相位稳定.
- 制造和异热热处理Al87.5Ti6.25Ta6.25合金.
- 使用X射线衍射 (XRD),扫描电子显微镜 (SEM) 和微分扫描热量计 (DSC) 的表征.
- 通过纳米沉积和微硬度测试对纳米机械性能进行评估.
主要成果:
- 实现了由FCC矩阵和Al3 ((Ti,Ta)) 类型的金属间相组成的双相微结构.
- 在FCC阶段,化过渡温度高达660°C.
- 记录了约3300MPa的特殊微硬度,超过了A390,7075 Al和CP-Ti等传统合金.
- 与Ti-64合金相比,这种合金在密度下降15%时表现出更高的强度.
- 通过长时间的热处理证实了增强的热稳定性,这归因于由驱动的相稳定.
结论:
- CALPHAD和驱动设计的协同方法对于开发先进的基于Al的合金是有效的.
- 开发的Al-Ti-Ta合金提供了高硬度,热稳定性和低密度的有希望的组合.
- 这种合金在高温应用中对比较重或性能较差的常规材料提供了可行的替代品.
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