Mapping strain across Co80Ta7B13 / Co62Ta6B32 glassy interfaces

Materials & Design, vol. 234, pp. 112327

Abstract

While multilayered thin film metallic glasses offer promising mechanical properties due to their interfaces, the correlation between chemical composition and and strain at the interfaces has not been investigated so far. Hence, atomic distance and composition variations across glassy Co80Ta7B13 / Co62Ta6B32 interfaces are revealed by correlative transmission electron microscopy, nanobeam precession electron diffraction (NBPED) mapping and atom probe tomography (APT). A composition dependent mean atomic distance is identified for the individual layers. At the interfaces, a chemically graded region of 4 nm thickness is observed with APT, while the mean atomic distance gradient - investigated by NBPED mapping - extends over 9 nm and cannot solely be explained by chemical composition changes. Instead, the excess thickness of the atomic distance gradient compared to the chemical gradient can be rationalized by the presence of strain at the interface.

Authors 8

1. Simon Evertz corresponding Aachen Materials Chemistry

   RWTH Aachen University

   Affiliation as printed

   Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen, Germany

2. Jakub Zálešák

   Montanuniversität Leoben

   Affiliation as printed

   Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, 8700 Leoben, Austria

3. Marcus Hans Aachen Materials Chemistry

   RWTH Aachen University

   Affiliation as printed

   Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen, Germany

4. Julius F. Keckes

   Austrian Academy of Sciences · Montanuniversität Leoben · Erich Schmid Institute of Materials Science

   Affiliation as printed

   Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, 8700 Leoben, Austria

   Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria

5. Huaping Sheng

   Austrian Academy of Sciences · Erich Schmid Institute of Materials Science

   Affiliation as printed

   Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria

6. Jürgen Eckert

   Austrian Academy of Sciences · Montanuniversität Leoben · Erich Schmid Institute of Materials Science

   Affiliation as printed

   Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, 8700 Leoben, Austria

   Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria

7. Christoph Gammer corresponding

   Austrian Academy of Sciences · Erich Schmid Institute of Materials Science

   Affiliation as printed

   Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria

8. Jochen M. Schneider Aachen Materials Chemistry

   RWTH Aachen University

   Affiliation as printed

   Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen, Germany