在受约束和不受约束的负载条件下的积累性滚动粘合 (ARB) Cu/Nb纳米层中的接口旋转,由现场微机械测试揭示
Rahul Sahay1,2, Ihor Radchenko1,3, Pavithra Ananthasubramanian2
1Xtreme Mechanics Laboratory, Engineering Product Development (EPD), Singapore University of Technology and Design (SUTD), 8 Somapah Road, Singapore 487372, Singapore.
Nanomaterials (Basel, Switzerland)
|October 15, 2025
概括
在机械测试过程中,铜/ (Cu/Nb) 纳米层呈现出意想不到的接口旋转. 这种在压缩和曲中观察到的新型接口介导的可塑性机制,表明了先进材料设计的内在特性.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 机械工程 机械工程
背景情况:
- 积累性滚动粘合 (ARB) Cu/Nb纳米层具有独特的基于接口的可塑性机制.
- 这些机制有助于产生非凡的特性,包括对极端环境的耐受性和自我愈合能力.
- 最近,在接口剪切中观察到异质性,横向方向 (TD) 的剪切比滚动方向 (RD) 更大.
研究的目的:
- 在各种负载条件下研究Cu/Nb ARB纳米层中的接口旋转.
- 为了确定接口旋转是否发生在没有外部旋转驱动力的情况下.
- 探索这种现象对纳米尺度可塑性和材料设计的影响.
主要方法:
- 在现场矩形微柱式压缩实验.
- 在现场微光束曲实验中使用预制的口.
- 在受约束和不受约束的负载下观察和分析接口行为.
主要成果:
- 在微柱压缩过程中观察到Cu/Nb ARB纳米层中的接口旋转,在TD中意外发生.
- 在微光束曲实验中证实了类似的接口旋转,特别是在偏移负载条件下.
- 发现这种现象在不同的加载模式中是可重复和一致的.
结论:
- 接口旋转被提出为Cu/Nb接口或具有特定方向关系的FCC/BCC接口的内在特征.
- 这代表了一个新的基于接口或接口介导的纳米尺度可塑性机制.
- 这些发现对设计具有增强伸展性的金属薄膜和其他先进应用具有重大潜在影响.
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