Abstract
In order to elucidate the mode of atom movements during order twinning in CuAu alloys, electron microscopy was carried out on thin films. The films for high resolution were prepared in vacuum by an extended Pashley method, and {101} order twins orthogonal to the film surface were produced by slow cooling some off-stoichiometric CuAu films from the disordered state to the ordered one. By observation of a hole at which the twin meets, a small deviation of the periphery was found in the twin band from that in the matrix. It supports the mode of atom movements which includes a small amount of homogeneous shear on successive (101) planes, and the exchange of atoms in every two layers of the (101) planes.
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