Journal
PHYSICAL REVIEW B
Volume 86, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.144302
Keywords
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [HA1344/23-1]
- University of Illinois by the US National Science Foundation [DMR 10-05813]
- US Department of Energy, Basic Energy Sciences [DOELANL 76604-001-10]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005813] Funding Source: National Science Foundation
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Forced chemical mixing in nanostructured Ag60Cu40 eutectic alloys during severe plastic deformation by high-pressure torsion (HPT) was quantitatively studied using x-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. Nearly complete chemical homogenization of the original lamellar structure with a wavelength of approximate to 165 nm was achieved after a shear strain of approximate to 350. The chemical mixing is accompanied by extensive grain refinement leading to nanocrystalline grains with average sizes of approximate to 42 nm. A Monte Carlo computer simulation model, which attributes mixing to dislocation glide, shows reasonable agreement with the experimental results. The model also shows that the characteristic strain for chemical homogenization scales linearly with the length scale of the system L, and not with the square of the length scale L-2, as would be expected for Fickian diffusion.
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