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

Autor(en)

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

Abstrakt

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(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

University of Illinois at Urbana-Champaign, Karlsruher Institut für Technologie, Lahore University of Management Sciences

Journal

Journal of Materials Research

Band

30

Seiten

1943-1956

Anzahl der Seiten

14

ISSN

0884-2914

DOI

https://doi.org/10.1557/jmr.2015.119

Publikationsdatum

06-2015

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/8a5e424a-843a-40c4-944c-ea4d7ab1b6b2