On the nature of deformation twins in ordered Ni3V

Electron microscopy observations on deformed specimens of ordered Ni3V show that deformation proceeds mainly by propagation of stacking faults and twinning. Dark field experiments proove that these deformation twins are ordered; it is concluded that deformation in this alloy is controlled by gliding of those partial dislocations leading to a stacking fault without any first neighbours wrong bonds, as previously expected on a theoretical basis.