Thermally activated deformation mechanisms and solid solution softening in W-Re alloys investigated via high temperature nanoindentation
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In: Materials and Design, Vol. 189.2020, No. April, 108499, 01.04.2020.
Research output: Contribution to journal › Article › Research › peer-review
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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 -
