TY - JOUR

T1 - Thermally activated deformation mechanisms and solid solution softening in W-Re alloys investigated via high temperature nanoindentation

AU - Kappacher, Johann

AU - Leitner, Alexander

AU - Kiener, Daniel

AU - Clemens, Helmut

AU - Maier-Kiener, Verena

PY - 2020/4/1

Y1 - 2020/4/1

N2 - Thermally activated deformation mechanisms in three different W-Re alloys were investigated by performing high temperature nanoindentation experiments up to 800 °C. With increasing Re content the athermal hardness increases, while the temperature-dependent thermal contribution is strongly decreased. This results in a reduced strain rate sensitivity for W-Re alloys compared to pure W. The origin of this effect is a reduction of the Peierls potential due to Re, manifesting in an increased activation volume at lower temperatures. This gives rise to a solid solution softening effect, while at high-temperature application the mechanical behavior is governed by dislocation-dislocation interaction and solution strengthening.

AB - Thermally activated deformation mechanisms in three different W-Re alloys were investigated by performing high temperature nanoindentation experiments up to 800 °C. With increasing Re content the athermal hardness increases, while the temperature-dependent thermal contribution is strongly decreased. This results in a reduced strain rate sensitivity for W-Re alloys compared to pure W. The origin of this effect is a reduction of the Peierls potential due to Re, manifesting in an increased activation volume at lower temperatures. This gives rise to a solid solution softening effect, while at high-temperature application the mechanical behavior is governed by dislocation-dislocation interaction and solution strengthening.

UR - http://www.scopus.com/inward/record.url?scp=85078475406&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2020.108499

DO - 10.1016/j.matdes.2020.108499

M3 - Article

VL - 189.2020

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

IS - April

M1 - 108499

ER -