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

作者：Mohamed Farghalli A^*

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2011, 528(3): 1431-1435.

DOI：10.1016/j.msea.2010.10.048

• Coble creep
• Deformation map
• High-strain rate superplasticity
• Micrograin superplasticity
• Nanocrystalline materials
• Triple-junction creep

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.

• 出版日期2011-1-25