The interaction of twins with existing substructure and twins in cobalt-iron alloys

摘要: Abstract Dislocation arrangements at twin interfaces and interactions between twins isolated dislocations, slip bands have been investigated in cobalt-8.0 9.5 wt.% iron alloys by transmission electron microscopy. Two coplanar sets of 1 6 〈112〉 partials are observed to bound a noncoherent boundary. It is suggested that the second set dislocations could form as result either interaction twinning 2 〈101〉 gliding composition plane or dissociation matrix-twin interface. The latter may occur relieve stresses likely exist tip terminating within crystal. Various situations evolve during slip-twin discussed. argued not be effective barriers propagating twins; supporting experimental evidence also presented. has confirmed diffraction intersections accomplished occurrence secondary crossed twin. Triangular prism shaped, twinned regions, lying contiguous extending away from intersections, observed. proposed these microstructural features localize matrix constraint experienced