期刊
ACTA MATERIALIA
卷 62, 期 -, 页码 276-285出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.10.009
关键词
Self-organization; Severe plastic deformation; Micro-structure; Solubility
资金
- National Science Foundation [DMR 10-05813]
- National Science Foundation's MRSEC Program [DMR-1121262]
- US Department of Energy [DE-FG02-07ER46453, DE-FG02-07ER46471]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005813] Funding Source: National Science Foundation
Severe plastic deformation (SPD) of Cu, Ag and Nb ternary alloys with average Nb concentrations of 5, 10 and 15 at.% and an Ag concentration of 10 at.% was studied using high resolution scanning electron microscopy, atom probe tomography and X-ray diffraction. Ball-milled powders were compacted, annealed at 600 or 950 degrees C and subsequently strained by high pressure torsion at room temperature. Ag redistributed homogeneously in the Cu matrix during SPD, but the Nb solubility increased by less than 1%. The Nb precipitates, moreover, self-organized into a patterned microstructure, whereby their sizes all fell within a narrow distribution, centered on similar to 20 nm. This size was independent of the initial microstructure for a given alloy and insensitive to the Nb concentration. The size was also insensitive to the method of shearing. Since Nb diffusion is negligible in Cu at room temperature, these results establish that SPD alone can induce compositional patterning in highly immiscible alloys. We discuss the mechanisms responsible for this behavior. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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