Control of twin boundary mobility by solute segregation in Mg binary alloys

Somekawa, Hidetoshi*; Tsuru, Tomohito   ; Naito, Kimiyoshi*; Singh, A.*

The segregated twin boundaries play a role in obstruction of dislocation slips. Thus, they contribute to increase in hardness. Internal friction tests reveal that, irrespective of the solute elements, induced twin boundaries are effective in enhancing damping capacity, owing to their reversible motion, i.e., growth and shrinkage. In contrast, by comparison of the loss factor of specimens with/without twin boundary segregation, segregation leads to a decrease in damping capacity. The energy barrier required for twin boundary sliding to occur is closely related to the loss factor.