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Deformation mechanism maps for micro-grained, ultrafine-grained, and nano-grained materials

机译：微晶粒，超细晶粒和纳米晶粒材料的变形机制图

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摘要

There are several deformation mechanisms that depend on grain size and are controlled by grain boundary diffusion. These mechanisms include: Coble creep, superplastic flow (micrograin superplastic flow and high-strain rate superplastic flow), and nanograin deformation. By combining the rate-controlling equations of these mechanisms and by making assumptions regarding triple-junction creep, a deformation map based on grain size was constructed. It is demonstrated that this map can account for the locations of experimental data representing three types of deformation behavior: micrograin superplasticity, high-strain rate superplasticity, and nanograin deformation.
机译：有几种变形机制取决于晶粒尺寸，并受晶界扩散控制。这些机制包括：蠕变蠕变，超塑性流（微晶超塑性流和高应变率超塑流）以及纳米晶粒变形。通过组合这些机制的速率控制方程，并进行有关三结蠕变的假设，构造了基于晶粒尺寸的变形图。结果表明，该图可以说明代表三种变形行为的实验数据的位置：微晶粒超塑性，高应变速率超塑性和纳米晶粒变形。

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