Self-organization of Cu-Ag during controlled severe plastic deformation at high temperatures

Author(s)
Salman N. Arshad, Timothy G. Lach, Julia Ivanisenko, Daria Setman, Pascal Bellon, Shen J. Dillon, Robert S. Averback
Abstract

Cu

90Ag

10 alloys were subjected to severe plastic deformation at temperatures ranging from 25 to 400 °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 ≈50 nm at 400 °C. Steady-state microstructural length scales were minimally affected by varying the strain rate, although at 400 °C, the grain morphology did depend on strain-rate. Our results show that diffusion below 300 °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.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
University of Illinois at Urbana-Champaign, Karlsruher Institut für Technologie, Lahore University of Management Sciences
Journal
Journal of Materials Research
Volume
30
Pages
1943-1956
No. of pages
14
ISSN
0884-2914
DOI
https://doi.org/10.1557/jmr.2015.119
Publication date
06-2015
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Keywords
ASJC Scopus subject areas
Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering, Materials Science(all)
Portal url
https://ucris.univie.ac.at/portal/en/publications/selforganization-of-cuag-during-controlled-severe-plastic-deformation-at-high-temperatures(8a5e424a-843a-40c4-944c-ea4d7ab1b6b2).html