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Gradient nanostructuring via compositional means
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DOI：10.1016/j.actamat.2023.118733.png)
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Abstract
En 中文
Nanocrystalline metals are inherently unstable against thermal and mechanical stimuli, commonly resulting in significant grain growth. Also, while these metals exhibit substantial Hall-Petch strengthening, they tend to suffer from low ductility and fracture toughness. With regard to the grain growth problem, alloying el-ements have been employed to stabilize the microstructure through kinetic and/or thermodynamic mechanisms. And to address the ductility challenge, spatially -graded grain size distributions have been developed to facilitate heterogeneous deformation modes: high-strength at the surface and plastic deformation in the bulk. In the present work, we combine these two strategies and present a new methodology for the fabrication of gradient nanostructured metals via compositional means. We have demonstrated that annealing a compositionally stepwise Pt-Au film with a homogenous microstructure results in a film with a spatial microstructural gradient, exhibiting grains which can be twice as wide in the bulk compared to the outer surfaces. Additionally, phase-field modeling was employed for the comparison with experimental results and for further investigation of the competing mechanisms of Au diffusion and thermally induced grain growth. This fabri-cation method offers an alternative approach for developing the next generation of microstructurally stable gradient nanostructured films.
Keywords:
GRAIN-BOUNDARY SEGREGATION
THERMAL-STABILITY
MECHANICAL-PROPERTIES
FATIGUE RESISTANCE
STAINLESS-STEEL
SURFACE-LAYER
AU-PT
NANOCRYSTALLINE
COPPER
SIZE
Journal
IF:
9.3
Papers:
2.0W
Citations:
12.9W
Organization
Cited Papers
ShareSaveStabilization of nanocrystalline alloys via grain boundary segregation: A diffuse interface model.png)
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