Diffusion-Mediated Superelongation in Metal Nanorods.
Phys Rev Lett
; 132(25): 256201, 2024 Jun 21.
Article
em En
| MEDLINE
| ID: mdl-38996262
ABSTRACT
We report in situ electron microscopy observation of the superelongation deformation of low-melting-point metal nanorods. Specifically, metal nanorods with diameters as small as 143 nm can undergo uniform stretching by an extraordinary 786% at â¼0.87T_{m} without necking. Moreover, the corresponding fracture stress exhibits a pronounced size effect. By combining experimental observations with molecular dynamic simulations, a crystal-core-liquid-shell structure is revealed, based on which a constitutive model that incorporates diffusion creep mechanism and surface tension effect is developed to rationalize the findings. This study not only establishes a pioneering reference for comprehending the diffusion-dominated constitutive response of nanoscale materials but also has substantial implications for strategic design and processing of metals in high-temperature applications.
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MEDLINE
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En
Ano de publicação:
2024
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Article