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This paper reports the evolution of order in stoichiometric Ni–25at.%V alloys with different thermal histories. In these alloys, the face-centred cubic structure of the disordered matrix transforms to a tetragonal (D0 22 ) structure during ordering. In such types of transformation, the process of order evolution involves a number of nucleation and growth processes, which are often competitive...
Effect of Nb additions on the stability of the D0 22 structure of the Ni 3 V phase has been investigated using X-ray diffraction, energy dispersive X-ray spectroscopy and transmission electron microscopy. Such additions are found to stabilize the D0 a phase. The result is explained on the basis of existing qualitative models.
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