NbTaHfTiZrV0.5耐火高合金的高温机械性能0.5 耐火高合金
Zhangquan Liu1, Xiaohui Shi1, Min Zhang1
1Laboratory of High-Entropy Alloys, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Entropy (Basel, Switzerland)
|August 26, 2023
概括
这项研究研究了耐火多主元素合金 (NbTaHfTiZrV0.5) 在高温下变形的情况. 合金表现出有希望的强度和可塑性,由位移滑动控制,使其适用于苛刻的工程应用.
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:
- 耐火多主元素合金 (RMPEAs) 由于其独特的特性,对于高温应用至关重要.
- 了解高温下RMPEA的变形机制对于其实际实施至关重要.
- 合金NbTaHfTiZrV0.5呈现了一个独特的组成,用于探索先进的材料性能.
研究的目的:
- 为了研究NbTaHfTiZrV0.5合金的高温变形机制.
- 评估合金的拉伸性能,包括强度和柔性,在广泛的温度范围内 (室温至1273K).
- 开发一个构成模型来预测合金在高温下的流动行为.
主要方法:
- 从室温到1273K的冷和冷凝NbTaHfTiZrV0.5板材的拉伸测试.
- 传输电子显微镜 (TEM) 用于分析微观结构层面的变形机制.
- 在不同温度和应变速率下获取真实应力-应变曲线,以告知构成模型.
主要成果:
- 合金NbTaHfTiZrV0.5在473K时表现出高拉伸柔性 (12%) 的情况.
- 收益强度在673873K范围内保持在800MPa以上,表明了特殊的高温强度.
- 脱位滑动被确定为主要的塑料变形机制,密度与变形程度相关.
- 使用实验数据成功构建了一个构成模型,以预测高温流动行为.
结论:
- NbTaHfTiZrV0.5合金表现出优异的高温机械性能,包括显著的强度和柔性.
- 脱位滑动是主要的变形机制,为合金设计提供了洞察力.
- 开发的构成模型为预测和优化合金在高温工程应用中的性能提供了有价值的工具.
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