Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 60: Mechanical Properties: Plasticity, fracture, fatigue, wear - I
MM 60.1: Talk
Thursday, March 19, 2020, 15:45–16:00, IFW B
Origins of Strength and Plasticity of the precious metal based high entropy alloy AuCuNiPdPt — •Felix Thiel1,5, Daniel Utt2, Dirk Seifert1, David Geissler1, Alexander Kauffmann3, Sascha Seils3, Martin Heilmaier3, Karsten Albe2, Mykhaylo Motylenko4, David Rafaja4, Jens Freudenberger1,4, and Kornelius Nielsch1,5 — 1Leibniz-IFW Dresden — 2TU Darmstadt — 3Karlsruhe Institut für Technologie — 4TU Bergakademie Freiberg — 5TU Dresden
The precious metal based High-Entropy Alloy (HEA) AuCuNiPdPt crystallises in a fcc structure and is single phase without chemical ordering. 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. The high strength in the recrystallised state is evaluated and found to originate predominantly upon solid solution strengthening. The work hardening behaviour is traced back to a steep increase in dislocation density as well as in deformation twinning. The microstructure and the mechanical properties of AuCuNiPdPt are assessed in detail.