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Updated: May 12, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Statistical analysis of composition fluctuations and short-range order in stoichiometric Ni-Cr-Mo alloys
A Verma1, N Wanderka, J B Singh
1Helmholtz-Zentrum Berlin für Materialien und Energie, Institut für Angewandte Materialforschung, Hahn-Meitner-Platz, 1 D-14109 Berlin, Germany; Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Abstract:
In the solution treated state Ni-Cr-Mo based alloys exhibit short-range order characterized by the appearance of diffuse intensity spots in electron diffraction patterns at {1 ½ 0} positions. This short-range order appears due to of the formation of chemical heterogeneities. In the present work we report on the investigation of short-range order in Ni-33 at% Cr and Ni-16.7 at% Cr-16.7 at% Mo alloys using transmission electron microscopy. Chemical heterogeneities and their sizes are analyzed by statistical methods applied to three-dimensional atom probe data obtained on the same alloys. The obtained chemical heterogeneities are correlated to regions of short-range order in Ni-33 at% Cr and Ni-16.7 at% Cr-16.7 at% Mo alloys.
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