Kinetics of Grain Boundary Networks Controlled by Triple Junction and Grain Boundary Mobility

The relationship between grain boundary structure, defect mobility, and grain boundary sink efficiency

Nanocrystalline materials have received great attention due to their potential for improved functionality and have been proposed for extreme environments where the interfaces are expected to promote radiation tolerance. However, the precise role of the interfaces in modifying defect behavior is unclear. Using long-time simulations methods, we determine the mobility of defects and defect cluster...

Grain boundary mobility – a brief review

This brief review describes the major features of grain boundary mobility in metals and current limitations in our theoretical understanding. Although thermally activated exchange of atoms across boundaries provides a basic picture of grain boundary correct to within an order of magnitude, no refinement of this theory is available that accounts for the experimental characteristics of grain mobi...

Intrinsic Grain Boundary Mobility in Alumina

Ultra-high purity alumina was sintered in hydrogen at temperatures ranging from 13251 to 20201C. Normal grain growth was maintained in all samples and grain boundary mobilities were measured. The data represent the most complete measure of intrinsic grain boundary mobility for alumina grain growth currently available. There are two orders of magnitude of discrepancy between the calculated and m...

Stabilizing nanostructured materials by coherent nanotwins and their grain boundary triple junction drag

Relating Grain-Boundary Complexion to Grain-Boundary Kinetics I: Calcia-Doped Alumina

Because of the complex nature of internal interfaces it has been a continual challenge to link the grain growth behavior of alumina (especially the onset of abnormal grain growth) to the internal interface structure and chemistry, and the associated atomic transport rate. The present work considers the problem of normal and abnormal grain growth development in calcia-doped alumina, a system not...