Thermally activated dislocation plasticity in body-centered cubic chromium studied by high-temperature nanoindentation
In-Chul Choi, Christian Brandl, Ruth Schwaiger
ACTA MATERIALIA | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2017
The deformation behavior of Chromium (Cr) was investigated with the goal to understand and quantify the thermally-activated dislocation plasticity and the transition to the temperature-/rate-independent regime in body-centered cubic (bcc) metals. High-temperature nanoindentation experiments were utilized to characterize the deformation behavior of bcc Cr from room temperature to 673 K. To validate the indentation method itself at elevated temperatures, we systematically studied the temperature-dependent indentation elastic modulus, which clearly shows a discontinuity at the magnetic phase transition at 308 K, which is quantitatively consistent with literature data. We characterized the kinet..View full abstract
Awarded by DFG (German Research Foundation)
I.-C. Choi acknowledges financial support by the Alexander von Humboldt Foundation. This research was supported by the DFG (German Research Foundation) under grant BR4886/2-1. We would like to thank the Karlsruhe Nano Micro Facility (KNMF, www.kit.edu/knmf) of the KIT for access to their instruments, in particular Dr. T. Bergfeldt for the chemical analysis.