Journal
JOURNAL OF MATERIALS RESEARCH
Volume 30, Issue 12, Pages 1943-1956Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2015.119
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Funding
- National Science Foundation [DMR 10-05813]
- National Science Foundation's MRSEC Program [DMR-1121262]
- Deutsche Forschungsgemeinschaft [HA1344/22-2]
- Austrian Science Fund FWF [T512-N20]
- Austrian Science Fund (FWF) [T 512] Funding Source: researchfish
- Austrian Science Fund (FWF) [T512] Funding Source: Austrian Science Fund (FWF)
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Cu90Ag10 alloys were subjected to severe plastic deformation at temperatures ranging from 25 to 400 degrees C and strain rates ranging from 0.1 to 6.25 s(-1) using high-pressure torsion. The deformed samples were characterized by x-ray diffraction, transmission electron microscopy, and atom-probe tomography. A dynamic competition between shear-induced mixing and thermally activated decomposition led to the self-organization of the Cu-Ag system at length scales varying from a few atomic distances at room temperature to approximate to 50 nm at 400 degrees C. Steady-state microstructural length scales were minimally affected by varying the strain rate, although at 400 degrees C, the grain morphology did depend on strain-rate. Our results show that diffusion below 300 degrees C is dominated by nonequilibrium vacancies, and by comparison with previous Kinetic Monte Carlo simulations [D. Schwen et al., J. Mater. Res. 28, 2687-2693 (2013)], their concentration could be obtained.
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