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.

在这里，我们报告了由两个纳米结构的梯度层（NGLs）和粗糙颗粒（CG）内部组成的梯度材料的剪切带主导变形原理。NGL中会形成多个剪切带，以适应所施加的应变。均匀伸长的大小取决于剪切带的稳定性，剪切带的稳定性取决于NGL和CG内部之间的约束强度。具体而言，约束越强，分散在NGL中的剪切带就越密实和稳定，从而导致更大的均匀伸长率。这一发现使我们深入了解了通过优化微观结构来利用异质结构中分散的稳定剪切带的理论基础。