ABSTRACT
We present an electron diffraction study of a Ni rich Ni-Al alloy. By considering the way the diffuse streaks intersect the reflecting sphere as a function of crystal orientation, we demonstrate that the diffraction patterns conventionally ascribed to the hexagonal ‘ω’ phase can be explained by the <110> streaking effect. We discuss the implication of the non-existence of the ‘ω’ phase for the mechanism of the martensitic transformation.
