Cr-Mo solid solutions forced by high-energy ball milling |
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Authors: | J D Hahn Fang Wu P Bellon |
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Affiliation: | (1) the School of Mechanical Engineering, Purdue University, 47907 West Lafayette, IN;(2) the Institute of Materials Science, University of Connecticut, 06269 Storrs, CT;(3) the Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 61801 Urbana, IL |
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Abstract: | Mixtures of Cr and Mo elemental powders, with the nominal compositions Cr25Mo75, Cr50Mo50, and Cr75Mo25, are processed by high-energy ball milling at ambient temperature. Milling is observed to force the mixing of the immiscible
bcc elements Cr and Mo into solid solutions. The lattice parameter of these solid solutions, measured by X-ray diffraction
(XRD), displays the expected positive deviation from Vegard’s law. These deviations are compared to the ones predicted by
Eshelby’s inclusion model for dilute alloys. The conventional Williamson-Hall approach is shown to fail to determine the grain
size in as-milled samples, probably due to the high density of dislocations. Annealing at 700 °C for 10 hours under argon
leads to a large reduction in structural defect density, without inducing any significant decomposition. The mixing measured
in Cr-Mo is discussed in the broader context of the mechanical mixing forced by ball milling in moderately immiscible systems. |
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