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

Johann Kappacher, Alexander Leitner, Daniel Kiener, Helmut Clemens, Verena Maier-Kiener

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Abstract

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.

Original languageEnglish
Article number108499
Number of pages6
JournalMaterials and Design
Volume189.2020
Issue numberApril
Early online date18 Jan 2020
DOIs
Publication statusPublished - 1 Apr 2020

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