Regensburg 2019 – wissenschaftliches Programm
MM 5.2: Vortrag
Montag, 1. April 2019, 10:30–10:45, H46
Plastic deformation of tungsten due to deuterium plasma exposure: Insights from micropillar compression tests — •Xufei Fang1, Marcin Rasinski2, Arkadi Kreter2, Christoph Kirchlechner1, Christian Linsmeier2, Gerhard Dehm1, and Steffen Brinckmann1 — 1Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany — 2Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
The understanding of hydrogen embrittlement in metals is of importance for the failure prediction in components. Previous nanoindentation tests have shown that exposure to deuterium (D) plasma causes a decrease in pop-in load and an increase in hardness of tungsten. In this work, we use micropillar compression to investigate the plastic deformation and apparent strain hardening of tungsten exposed to D. In comparison to reference pillars, the pillars tested after exposure showed an increased apparent strain hardening rate as well as an increased multitude of slip traces. These outcomes are attributed to the presence of D that impedes the dislocation motion. Different loading rates in micropillar compression shed light on the competing mechanisms of dislocation and D mobility.