Dense dispersed shear bands in gradient-structured Ni
| Autor: | Xiaolei Wu, Fengjiao Guo, Qiong He, Mingsai Wang, Yuntian Zhu, Chongxiang Huang, Yusheng Li, Yanfei Wang, Ronald O. Scattergood |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering 02 engineering and technology Plasticity 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Shear (geology) Mechanics of Materials 0103 physical sciences Ultimate tensile strength Surface roughness General Materials Science Surface layer Composite material Deformation (engineering) 0210 nano-technology Shear band |
| Zdroj: | International Journal of Plasticity. 124:186-198 |
| ISSN: | 0749-6419 |
| Popis: | During tensile deformation, nanostructured (NS) metals often fail soon after yielding by forming a localized shear band. Here we report the observation of high density of shear bands that are homogeneously dispersed in the NS layer of a gradient Ni sample. These shear bands were nucleated at early elastic/plastic strain stage, reached number saturation at ∼3% strain, and remained arrested by the central coarse-grained (CG) matrix during the entire plastic deformation, resulting in a uniform tensile plasticity comparable to that of CG matrix. The formation of dispersed shear bands was promoted by the elastic/plastic interaction between NS surface layer and CG matrix, and affected by the surface roughness and the hardness variation in the NS surface layer. The width of shear bands remained constant, but the intensity of strain accumulation increased almost linearly with applied tensile strain, suggesting a stable shear banding process. Microstructure examination revealed that the strain in shear bands was accommodated by mechanically driven grain boundary migration and grain coarsening. These results clarify the fundamental questions: why/how does the NS layer supported by CG matrix achieve large uniform elongation? Moreover, the findings demonstrate the possibility of activating dispersed stable shear bands by synthesizing gradient architecture for optimized mechanical performances, i.e., a new strategy for evading the strength-ductility tradeoff in NS metals. |
| Databáze: | OpenAIRE |
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