High-Temperature Nanoindentation of an Advanced Nano-Crystalline W/Cu Composite
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In: Nanomaterials, Vol. 11, No. 11, 2951, 03.11.2021.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - High-Temperature Nanoindentation of an Advanced Nano-Crystalline W/Cu Composite
AU - Burtscher, Michael
AU - Zhao, Mingyue
AU - Kappacher, Johann
AU - Leitner, Alexander
AU - Wurmshuber, Michael
AU - Pfeifenberger, Manuel J.
AU - Maier-Kiener, Verena
AU - Kiener, Daniel
N1 - Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/11/3
Y1 - 2021/11/3
N2 - The applicability of nano-crystalline W/Cu composites is governed by their mechanical properties and microstructural stability at high temperatures. Therefore, mechanical and structural investigations of a high-pressure torsion deformed W/Cu nanocomposite were performed up to a temperature of 600 °C. Furthermore, the material was annealed at several temperatures for 1 h within a high-vacuum furnace to determine microstructural changes and surface effects. No significant increase of grain size, but distinct evaporation of the Cu phase accompanied by Cu pool and faceted Cu particle formation could be identified on the specimen′s surface. Additionally, high-temperature nanoindentation and strain rate jump tests were performed to investigate the materials mechanical response at elevated temperatures. Hardness and Young′s modulus decrease were noteworthy due to temperature-induced effects and slight grain growth. The strain rate sensitivity in dependent of the temperature remained constant for the investigated W/Cu composite material. Also, the activation volume of the nano-crystalline composite increased with temperature and behaved similar to coarse-grained W. The current study extends the understanding of the high-temperature behavior of nano-crystalline W/Cu composites within vacuum environments such as future fusion reactors.
AB - The applicability of nano-crystalline W/Cu composites is governed by their mechanical properties and microstructural stability at high temperatures. Therefore, mechanical and structural investigations of a high-pressure torsion deformed W/Cu nanocomposite were performed up to a temperature of 600 °C. Furthermore, the material was annealed at several temperatures for 1 h within a high-vacuum furnace to determine microstructural changes and surface effects. No significant increase of grain size, but distinct evaporation of the Cu phase accompanied by Cu pool and faceted Cu particle formation could be identified on the specimen′s surface. Additionally, high-temperature nanoindentation and strain rate jump tests were performed to investigate the materials mechanical response at elevated temperatures. Hardness and Young′s modulus decrease were noteworthy due to temperature-induced effects and slight grain growth. The strain rate sensitivity in dependent of the temperature remained constant for the investigated W/Cu composite material. Also, the activation volume of the nano-crystalline composite increased with temperature and behaved similar to coarse-grained W. The current study extends the understanding of the high-temperature behavior of nano-crystalline W/Cu composites within vacuum environments such as future fusion reactors.
KW - <p>W/Cu composite</p>
KW - high-pressure torsion
KW - microstructure
KW - nanocrystalline
KW - nanoindentation
KW - W/Cu composite
KW - High-pressure torsion
KW - Nanoindentation
KW - Microstructure
KW - Nanocrystalline
UR - http://www.scopus.com/inward/record.url?scp=85118338593&partnerID=8YFLogxK
U2 - 10.3390/nano11112951
DO - 10.3390/nano11112951
M3 - Article
VL - 11
JO - Nanomaterials
JF - Nanomaterials
SN - 2079-4991
IS - 11
M1 - 2951
ER -