Grain boundary behavior in superplastic Mg-doped alumina with yttria codoping

Microstructures, crystallography of interfaces, and creep behavior of melt-growth composites

“…Only in a few cases, basal twinning has been observed in alumina submitted to plastic deformation. 19,20 These observations are in agreement with the high value of the stress component. Finally, interfacial dislocations arranged by pairs are present in most interfaces (Fig.…”

Structure and chemistry of grain boundaries in yttria doped aluminas

“…In this last case, which occurs in the general GB, it is assumed that yttrium has been attracted by the strain field of dislocations that are then stabilized by segregated species. This result justifies the proposed strengthening mechanisms that accounts for the modification of the fine-grained alumina superplastic behavior when yttrium is added [17,18]. Indeed, dislocations are present in general GB's after creep in agreement with the assumption of lower GB diffusion that results in a decrease in GB dislocation accommodation processes.…”

Interfacial Kinetic Engineering: How Far Have We Come Since Kingery's Inaugural Sosman Address?

“…Controlling the atom transport rate determines the production, performance, and reliability of most materials (Panel 3). In some situations, it is desirable to achieve the slowest possible transport rate, for example to promote a material's resistance to creep 3–12 or oxidation, 13–16 or to inhibit its rate of grain growth 17–20 in order to achieve a fine grain, e.g. nanograin microstructure.…”