A diffraction study of the substructure in cold-worked Ni3Al

Publisher Website
Google Scholar
Abstract
A study of the substructure in cold‐worked Ni3Al (Ll2) phase was performed employing x‐ray powder diffraction technique. Analyses of the peak shapes, positions, and intensities of the fundamental and superstructure reflections show the importance of several substructural features, including especially the a/6 {211} {111}‐type single‐layer and multilayer stacking faults following deformation at the liquid‐nitrogen temperature. Atomic disorder and antiphase boundaries on {111} and {100} also occur in the cold‐worked material; however, these are not as prominent as those reported in the Cu‐based L12 phases under comparable or less severe deformation conditions. An attempt to determine the importance of the low‐energy a/3 〈211〉 {111}‐type stacking fault on the basis of the limited number of superstructure reflections available in the powder pattern shows it to be less significant in the low‐temperature‐deformed material compared to the usual a/6 〈211〉 {111}‐type intrinsic fault, although the latter has a higher energy in the Ll2 structure.