Yield Point Phenomenon and Serrated Yielding in Nb-40Ti-15Al

Abstract

AbstractThe ternary Nb-40Ti-15Al (at%) intermetaltic has an ordered B2-type crystal structure and shows appreciable ductility. Deformation is mainly accommodated in slip bands by the glide of b=l/2<lll> dislocations on {110} planes. The tensile behavior of this material has been studied at room temperature and at intermediate temperatures. Static and dynamic strain aging have been observed in certain temperature regimes. A model based on dislocation pinning by precipitates is proposed to explain the serrations observed during dynamic strain aging.