TY - JOUR
T1 - Cr-Mo solid solutions forced by high-energy ball milling
AU - Hahn, J. D.
AU - Wu, Fang
AU - Bellon, P.
N1 - Funding Information:
This research was supported by the National Science Foundation, Grant No. DMR-9733582. Stimulating discussions with R.S. Averback, B. Gundrum, U. Herr, T. Klassen, G. Martin, and P. Sofronis are gratefully acknowledged.
PY - 2004
Y1 - 2004
N2 - Mixtures of Cr and Mo elemental powders, with the nominal compositions Cr25Mo75, Cr50Mo50, and Cr 75Mo25, 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.
AB - Mixtures of Cr and Mo elemental powders, with the nominal compositions Cr25Mo75, Cr50Mo50, and Cr 75Mo25, 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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U2 - 10.1007/s11661-004-1013-8
DO - 10.1007/s11661-004-1013-8
M3 - Article
AN - SCOPUS:33645281669
SN - 1073-5623
VL - 35
SP - 1105
EP - 1111
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 13
ER -