Origins of strength and plasticity in the precious metal based high-entropy alloy AuCuNiPdPt
Thiel F, Geissler D, Nielsch K, Kauffmann A, Seils S, Heilmaier M, Utt D, Albe K, Motylenko M, Rafaja D, Freudenberger J (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 185
Pages Range: 400-411
DOI: 10.1016/j.actamat.2019.12.020
Abstract
The precious metal based High-Entropy Alloy (HEA) AuCuNiPdPt crystallises in a face-centred cubic structure and is single phase without chemical ordering after homogenisation. However, a decomposition is observed after annealing at intermediate temperatures. This HEA shows extended malleability during cold work up to a logarithmic deformation degree of φ=2.42. The yield strength ranges from 820 MPa in the recrystallised state to 1170 MPa when strain hardened by cold working with a logarithmic deformation degree of φ > 0.6. This work hardening behaviour is traced back to a steep increase in dislocation density as well as in deformation twinning occurring at low strain. The microstructure and the mechanical properties of AuCuNiPdPt are assessed in detail by various methods. EBSD and TEM analyses reveal mechanical twinning as an important deformation mechanism. The high strength in the recrystallised state is evaluated and found to originate predominantly upon solid solution strengthening.
Involved external institutions
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
Technische Universität Darmstadt
Germany (DE)
Technische Universität Bergakademie Freiberg
Germany (DE)
Germany (DE)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
Technische Universität Darmstadt
Germany (DE)
Technische Universität Bergakademie Freiberg
Germany (DE)
How to cite
APA:
Thiel, F., Geissler, D., Nielsch, K., Kauffmann, A., Seils, S., Heilmaier, M.,... Freudenberger, J. (2020). Origins of strength and plasticity in the precious metal based high-entropy alloy AuCuNiPdPt. Acta Materialia, 185, 400-411. https://doi.org/10.1016/j.actamat.2019.12.020
MLA:
Thiel, F., et al. "Origins of strength and plasticity in the precious metal based high-entropy alloy AuCuNiPdPt." Acta Materialia 185 (2020): 400-411.
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