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Forced chemical mixing of immiscible Ag-Cu heterointerfaces using high-pressure torsion

Pouryazdan, M. and Schwen, D. and Wang, D. and Scherer, T. and Hahn, H. and Averback, R. S. and Bellon, P. (2012):
Forced chemical mixing of immiscible Ag-Cu heterointerfaces using high-pressure torsion.
In: Physical Review B, American Physical Society, p. 144302, 86, (14), ISSN 1098-0121,
[Online-Edition: http://dx.doi.org/10.1103/PhysRevB.86.144302],
[Article]

Abstract

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 ≈ 165 nm was achieved after a shear strain of ≈ 350. The chemical mixing is accompanied by extensive grain refinement leading to nanocrystalline grains with average sizes of ≈ 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 L2, as would be expected for Fickian diffusion.

Item Type: Article
Erschienen: 2012
Creators: Pouryazdan, M. and Schwen, D. and Wang, D. and Scherer, T. and Hahn, H. and Averback, R. S. and Bellon, P.
Title: Forced chemical mixing of immiscible Ag-Cu heterointerfaces using high-pressure torsion
Language: English
Abstract:

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 ≈ 165 nm was achieved after a shear strain of ≈ 350. The chemical mixing is accompanied by extensive grain refinement leading to nanocrystalline grains with average sizes of ≈ 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 L2, as would be expected for Fickian diffusion.

Journal or Publication Title: Physical Review B
Volume: 86
Number: 14
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Jun 2014 11:23
Official URL: http://dx.doi.org/10.1103/PhysRevB.86.144302
Identification Number: doi:10.1103/PhysRevB.86.144302
Funders: The research at TUD and KIT was financially supported by Deutsche Forschungsgemeinschaft (DFG) under the Project HA1344/23-1. , The research at the University of Illinois by was financially supported by the US National Science Foundation under Grant DMR 10-05813 and the US Department of Energy, Basic Energy Sciences under Grant DOE LANL 76604-001-10 (EFRC-CMIME).
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