Deformation of Co3AlC0.5 and a Co3AlC0.5-strengthened cobalt-based alloy

Plastic deformation features of Co3AlC0.5 and a Co3AlC0.5-strengthened cobalt-based alloy were studied by means of transmission electron microscopy. It was found that <110>{111} slip system is activated and dissociation of superlattice dislocations occurs in Co3AlC0.5 in a manner similar to the L12 structure. However, in contrast to the L12 structure, motion of dislocations is hindered by the pre-existing thermally grown-in anti-phase boundaries formed by wrong site occupation of carbon atoms, a unique type of crystal defects in Co3AlC0.5. On the other hand, deformation of the α(Co) alloy containing fine Co3AlC0.5 precipitates is characterized by localized slip of 1/6<211> Shockley partial dislocations cutting through the fine Co3AlC0.5 particles, leaving behind a highly disordered band region.