摘要
Internal friction decreased with increasing lithium content. The decrease in the amplitude-independent decrement was attributed to the decrease in effective dislocation loop length caused by the increasing concentration of lithium antistructure defects. The decrease in amplitude-dependent decrement and the increase in dislocation breakaway strain with increasing lithium composition were qualitatively in agreement with Granato and Luecke theory; however, curved plots were observed. Microhardness increased monotonically in the beta -phase region with increasing lithium content; no strength minimum was observed near the stoichiometric composition. Vacancies in the lithium sublattice did not show strengthening effect. Dislocation motion was impeded by lithium antistructure point defects.