title: Statistical analysis of composition fluctuations and short-range order in stoichiometric Ni-Cr-Mo alloys.
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.
authors.affiliation: Helmholtz-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.
authors.forename: A
authors.initials: A
authors.lastname: Verma
authors.forename: N
authors.initials: N
authors.lastname: Wanderka
authors.forename: J B
authors.initials: JB
authors.lastname: Singh
authors.forename: B
authors.initials: B
authors.lastname: Kumar
authors.forename: J
authors.initials: J
authors.lastname: Banhart
keywords: (3D-AP) Three-dimensional atom probe; (SRO) Short-range order; Composition fluctuations; Statistical analysis; TEM (transmission electron microscopy)