|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Mechanisms of Grain Boundary Diffusion in Severely Deformed Materials
||Sergii Divinsky, Gerhard Wilde
|On-Site Speaker (Planned)
An overview of current understanding of diffusion properties of grain boundaries in severely deformed materials is presented. The results are analyzed with respect to the types of severe plastic deformation, defects introduced by such processing, and processing parameters. An extended hierarchy of diffusion paths is shown to exist in ultra-fine grained materials, with relative diffusion rates being different by orders of magnitude. Properties of deformation-modified grain boundaries, such as width, diffusivity, diffusion mechanism and free volume excess, are examined. A model of deformation-modified state of general high-angle grain boundaries is discussed with respect to the underlying concept of free volume accumulation.
The relaxation stages of the deformation-modified state of grain boundaries are analyzed.
Acknowledgment: Financial support of DFG is acknowledged.