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Ductility by shear band delocalization in the nano-layer of gradient structure

机译:梯度结构纳米层中剪切带离域的延展性

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Nanostructured (NS) metals typically fail soon after yielding, starting with the formation of narrow shear bands. Here we report the observation of shear band delocalization in gradient metals. Shear bands were nucleated and delocalized in the NS layers by propagating along the gage length soon after yielding, converting the shear band into a localized strain zone (LSZ). Synergistic work hardening was developed in the LSZ by regaining dislocation hardening capability, and by back-stress hardening from the strain gradients in the axial and depth directions, which helped with enhancing global ductility.
机译:纳米结构(NS)金属通常在屈服后很快失效,首先是形成窄剪切带。在这里,我们报告了在梯度金属中剪切带离域的观察。剪切带在屈服后不久通过沿应变片长度传播而在NS层中形核并离域,将剪切带转换为局部应变带(LSZ)。通过重新获得位错淬火能力,以及通过沿轴向和深度方向的应变梯度进行反应力淬火,在LSZ中开展了协同工作淬火,这有助于增强整体延性。

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