@article{wang_huang_li_guo_he_wang_wu_scattergood_zhu_2020, title={Dense dispersed shear bands in gradient-structured Ni}, volume={124}, ISSN={["1879-2154"]}, DOI={10.1016/j.ijplas.2019.08.012}, abstractNote={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.}, journal={INTERNATIONAL JOURNAL OF PLASTICITY}, author={Wang, Yanfei and Huang, Chongxiang and Li, Yusheng and Guo, Fengjiao and He, Qiong and Wang, Mingsai and Wu, Xiaolei and Scattergood, Ronald O. and Zhu, Yuntian}, year={2020}, month={Jan}, pages={186–198} }
 @article{wang_huang_li_fang_wang_he_guo_zhu_2020, title={Shear band stability and uniform elongation of gradient structured material: Role of lateral constraint}, volume={37}, ISSN={["2352-4316"]}, DOI={10.1016/j.eml.2020.100686}, abstractNote={Here we report a shear bands-dominated deformation principle for the gradient material composed of two nanostructured gradient layers (NGLs) and a coarse-grained (CG) interior. Multiple shear bands form in the NGL to accommodate the applied strain. The magnitude of uniform elongation depends on shear band stability, and shear band stability is determined by the intensity of constraint between NGL and CG interior. Specifically, the stronger the constraint, the denser and more stable the shear bands dispersed in the NGL, thereby leading to larger uniform elongation. This finding sheds insight into the theoretical basis of harnessing dispersed stable shear bands in heterostructures by optimizing microstructure architecture.}, journal={EXTREME MECHANICS LETTERS}, author={Wang, Yanfei and Huang, Chongxiang and Li, Zhongkai and Fang, Xiaotian and Wang, Mingsai and He, Qiong and Guo, Fengjiao and Zhu, Yuntian}, year={2020}, month={May} }