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Dislocation Plasticity and Detwinning Under Thermal Stresses in Nanotwinned Ag Thin Films

43 Pages Posted: 18 May 2020 Publication Status: Accepted

See all articles by Maya K. Kini

Maya K. Kini

Max Planck Institute for Iron Research

Claudia Merola

Vienna University of Technology - Institute for Applied Physics

Benjamin Breitbach

Max Planck Institute for Iron Research

Dennis Klapproth

Max Planck Institute for Iron Research

Bastian Philippi

AG der Dillinger Hüttenwerke

Jean-Baptiste Molin

Max Planck Institute for Iron Research

Christoph Kirchlechner

Max Planck Institute for Iron Research

Gerhard Dehm

Max Planck Institute for Iron Research

Abstract

Wafer curvature measurements reported in literature for polycrystalline (often textured) and epitaxial fcc metal thin films on hard substrates show a characteristic "signature" in the stress-temperature evolution for either type of films. While epitaxial films reveal characteristic elastic - ideal plastic deformation with no dislocation storage and highly repeatable cycles, polycrystalline films show considerable hardening upon cooling in addition to the relaxation by diffusional creep at elevated temperatures. In the present study, we study the deformation characteristics of an electron beam deposited epitaxial nanotwinned Ag on Si (111) substrate. The twin spacing λ of the nanotwinned Ag is controlled by suitable heat treatment and the "signature" thermomechanical deformation curves by wafer curvature measurements are recorded for twin spacings varying from 20 nm to 1 μm. Further, deformation is compared to other small scale deformation studies on fcc metals such as epitaxial bicrystal films, bicrystal micropillars containing a coherent twin boundary and nanotwinned micropillars.

Keywords: thin film plasticity, size effect, coherent twin boundaries, thermomechanical deformation, epitaxial nanotwinned fcc metals

Suggested Citation

Kini, Maya K. and Merola, Claudia and Breitbach, Benjamin and Klapproth, Dennis and Philippi, Bastian and Molin, Jean-Baptiste and Kirchlechner, Christoph and Dehm, Gerhard, Dislocation Plasticity and Detwinning Under Thermal Stresses in Nanotwinned Ag Thin Films. Available at SSRN: https://ssrn.com/abstract=3591844 or http://dx.doi.org/10.2139/ssrn.3591844

Maya K. Kini (Contact Author)

Max Planck Institute for Iron Research ( email )

Max-Planck-Straße 1
Max Planck Strasse 1
40237 Düsseldorf, DE Nordrhein-Westfalen 40237
Germany

Claudia Merola

Vienna University of Technology - Institute for Applied Physics

Karlsplatz 13
Vienna
Austria

Benjamin Breitbach

Max Planck Institute for Iron Research

Max-Planck-Straße 1
Max Planck Strasse 1
40237 Düsseldorf, DE Nordrhein-Westfalen 40237
Germany

Dennis Klapproth

Max Planck Institute for Iron Research

Max-Planck-Straße 1
Max Planck Strasse 1
40237 Düsseldorf, DE Nordrhein-Westfalen 40237
Germany

Bastian Philippi

AG der Dillinger Hüttenwerke

Dillingen
Germany

Jean-Baptiste Molin

Max Planck Institute for Iron Research

Max-Planck-Straße 1
Max Planck Strasse 1
40237 Düsseldorf, DE Nordrhein-Westfalen 40237
Germany

Christoph Kirchlechner

Max Planck Institute for Iron Research

Max-Planck-Straße 1
Max Planck Strasse 1
40237 Düsseldorf, DE Nordrhein-Westfalen 40237
Germany

Gerhard Dehm

Max Planck Institute for Iron Research

Max-Planck-Straße 1
Max Planck Strasse 1
40237 Düsseldorf, DE Nordrhein-Westfalen 40237
Germany

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