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Size Dependent Strength, Slip Transfer and Slip Compatibility in Nanotwinned Silver

41 Pages Posted: 7 Aug 2019 Publication Status: Accepted

See all articles by Maya K. Kini

Maya K. Kini

Max Planck Institute for Iron Research

Gerhard Dehm

Max Planck Institute for Iron Research

Christoph Kirchlechner

Max Planck Institute for Iron Research

Abstract

Perfect slip transfer through single coherent Σ3 twin boundaries is known to be a cross-slip-like mechanism occurring at low stresses, which is expected to strongly depend on material properties like stacking fault energy. In the present study, we extend the argument of perfect slip transfer to (i) multiple closely spaced coherent twin boundaries in a nanotwinned thin film and (ii) to materials with very low stacking fault energy. The slip transfer is indicated by the continuity of slip steps and observed across up to 100 coherent Σ3 boundaries. The study addresses size scaling due to multiple weak obstacles for dislocation motion and discusses the underlying deformation mechanisms. The importance of strain compatibility is further extended to incoherent twin boundaries.

Keywords: Dislocation-grain boundary interactions, coherent twin boundary, slip transmission, nanotwinned fcc

Suggested Citation

Kini, Maya K. and Dehm, Gerhard and Kirchlechner, Christoph, Size Dependent Strength, Slip Transfer and Slip Compatibility in Nanotwinned Silver (August 4, 2019). Available at SSRN: https://ssrn.com/abstract=3431830 or http://dx.doi.org/10.2139/ssrn.3431830

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

Gerhard Dehm

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

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