Abstract
A conscientious study by X-Ray diffractometry has been done to determine long-range order parameter, the lattice constant, and crystallite size of B2 NiAl (Cu) as a function of Ni concentration. Addition of Zr and Ti as micro-alloying elements enhances the lattice parameter as well as ordering behaviour, particularly at higher Ni concentration in the alloys. Our present investigation shows that a broad concentration range of Ni content is suitable for the formation of B2 structure. Ordering behaviour in NiAl is explained by the formation of the antiphase boundary based on the data of transmission electron microscopy (TEM) study and enthalpy of formation of the corresponding compositions.
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