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类似纳克的表面纳米层增强纯的疲劳抵抗力

Yong Zhang¹, Chenyun He¹, Qin Yu²

¹Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China.

Nature communications

|August 12, 2024

概括

这项研究引入了纯的新型渐变结构,使用类似于NACRE的纳米层,通过延迟裂的启动和传播,显著提高疲劳抵抗力.

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:

疲劳失效是金属元件的一个关键问题.
现有的微结构策略往往无法协同增强裂纹启动和传播阻力.

研究的目的:

开发纯的梯度结构,以获得卓越的抗疲劳性.
研究表面纳米层和地下双胞胎结构的协同效应.

主要方法:

设计一个梯度结构,在表面上使用类似纳米的纳米层,在下面使用多变体的双胞胎结构.
在周期性负荷下分析谷物边界的适应.
评估疲劳裂的启动和传播速度.

主要成果:

纳米层表面层增强了稳定性,延迟了裂核形成.
纳米层材料的高频裂纹偏移 (≈1.7 × 10^3 倍/mm) 将裂纹的传播减少两个数量级.
梯度结构表现出明显更高的耐疲劳性比同质的同行.

结论:

拟议的梯度结构有效地克服了传统微结构策略的局限性.
这种方法为设计先进的耐疲劳金属合金提供了可扩展和可持续的方法.

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