双金属接口封闭对多层Cu/Nb多层复合材料的Hall-petch斜率的影响
Chaogang Ding1,2, Jie Xu1,2, Debin Shan1,2
1National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China.
Heliyon
|May 30, 2023
概括
铜/ (Cu/Nb) 多层复合材料在较小层厚的情况下显示出增强的机械性能. 然而,在纳米尺度上,由于层内部的脱位滑动,接口强化效应会减弱.
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:
- 异构材料为增强机械性能提供了新的方法,这对于先进的材料科学和工程至关重要.
- 多层复合材料,特别是金属-金属系统,是开发具有卓越性能特性的材料的关键.
研究的目的:
- 为了研究层厚对铜/ (Cu/Nb) 多层复合材料的微观结构和机械性能的影响.
- 分析收益率强度和层厚度之间的关系,并了解潜在的增强机制.
主要方法:
- 制造Cu/Nb多层复合材料,使用积累式卷粘合,层厚度从微米到纳米尺度.
- 微观结构的表征和机械性能测试 (收益强度,最终的抗拉强度) 的制造复合材料.
主要成果:
- 随着层厚度的降低,Cu/Nb复合材料的收益强度和最终抗拉强度会增加.
- 观察到霍尔-佩奇关系,但在纳米尺度上,斜率下降,表明偏离了传统的强化.
- 观察到Cu和Nb层内的脱位滑动,阻碍了接口上的脱位堆积,并减少了接口的强化.
结论:
- 在Cu/Nb多层复合材料中降低层厚可提高机械强度,遵循修改后的Hall-Petch行为.
- 纳米尺度的变形机制,特别是层内部的脱位滑动,限制了这些异构结构中接口强化的有效性.
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