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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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在高合金纳米柱中的室温超延长
Qian Zhang1, Ranming Niu2, Ying Liu2
1Centre for Advanced Mechanics and Materials, Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China.
Nature communications
|November 17, 2023
概括
高合金在纳米尺度上表现出显著的可塑性. 这项研究表明,CoCrFeNi纳米柱中的协调变形结合和位位滑使得超高均延长,提高了机械可靠性.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 纳米技术纳米技术
背景情况:
- 纳米金属材料通常具有高强度,但具有有限的拉伸性.
- 过早失效是小型金属材料中常见的问题.
研究的目的:
- 研究纳米级高合金中超高均拉伸柔性背后的机制.
- 了解变形机制如何在纳米尺度上促进增强机械性能.
主要方法:
- 制造单晶<110>面向的高合金CoCrFeNi纳米柱.
- 高分辨率显微镜技术. 高分辨率显微镜技术.
- 大规模的原子学模拟.
主要成果:
- 在高流应力 (0.6-1.0 GPa) 时,达到高达~110%的室温均延长.
- 确定了变形生和脱位滑动的协同协调作为关键机制.
- 证明了原子水平的组成异质性驱动这些变形机制.
结论:
- 在纳米级CoCrFeNi高合金中,超高拉伸柔性是由结合和滑动的相互作用促进的.
- 这些协调的机制促进了变形移位和延迟部失效.
- 提供了设计可靠的纳米设备使用多主元素合金的见解.
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