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Verma A.,Helmholtz Center Berlin | Verma A.,Bhabha Atomic Research Center | Wanderka N.,Helmholtz Center Berlin | Wanderka N.,Institute of Advanced Material Research | And 4 more authors.
Journal of Alloys and Compounds | Year: 2014

The evolution of long-range order from a disordered state has been studied in a splat-quenched Ni2(Cr0.5Mo0.5) alloy. The evolution of the order in this alloy follows a continuous ordering mechanism without the need of the superimposition of a1 1/2 0a type static concentration waves that are believed to be necessary for the evolution of ordered Ni 2(Cr,Mo) phase (with a Pt2Mo type structure) from a short-range order state. The proposed mechanism is based upon the geometrical evidence of the inherent presence of a subunit cell of Pt2Mo structure in the N2M2 stacking sequence on {4 2 0} planes in the {1 1/20} short range order. Addition of Cr to stoichiometric Ni 2Mo alloy stabilizes the N2M2 order which in turn stabilizes the Pt2Mo state. The stability of the N 2M2 stacking sequence and Pt2Mo order in the short-range ordered state has been discussed in the light of pair interaction energies. © 2013 Elsevier B.V. All rights reserved.

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