假弹性
材料科学
晶界
纳米晶
纳米尺度
堆积
纳米技术
复合材料
微观结构
马氏体
核磁共振
物理
作者
Heng Deng,Yingbin Chen,Qi Zhu,Qingkun Zhao,Qishan Huang,Jiangwei Wang,Haofei Zhou
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-02-19
卷期号:24 (8): 2511-2519
标识
DOI:10.1021/acs.nanolett.3c04439
摘要
Materials with pseudoelasticity can recover from large strains exceeding their elastic limits during unloading, making them promising damage-tolerant building blocks for advanced nanodevices. Nevertheless, a practical approach to realize controllable pseudoelastic behavior at nanoscale remains challenging. Here, we proposed a grain boundary (GB) engineering approach to endow metallic nanocrystals with a controllable pseudoelasticity. Both in situ nanomechanical testing and atomistic simulations demonstrate that such controllable pseudoelasticity is governed by the extension and contraction of an inherent stacking fault array at the GB. By precisely tuning GB misorientation and inclination, our simulation results reveal that metallic nanocrystals can exhibit tailored pseudoelastic performance across a broad spectrum of GBs in different face-centered cubic metals. These findings enrich our understanding of the intrinsic pseudoelasticity of GBs and provide a GB engineering approach toward metallic materials with reversible deformability.
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