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Origins of strength and plasticity in the precious metal based high-entropy alloy AuCuNiPdPt

Thiel, F. and Geissler, D. and Nielsch, K. and Kauffmann, A. and Seils, S. and Heilmaier, M. and Utt, D. and Albe, K. and Motylenko, M. and Rafaja, D. and Freudenberger, J. (2020):
Origins of strength and plasticity in the precious metal based high-entropy alloy AuCuNiPdPt.
In: Acta Materialia, 185, pp. 400-411. Elsevier Ltd., ISSN 13596454,
DOI: 10.1016/j.actamat.2019.12.020,
[Article]

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.

Item Type: Article
Erschienen: 2020
Creators: Thiel, F. and Geissler, D. and Nielsch, K. and Kauffmann, A. and Seils, S. and Heilmaier, M. and Utt, D. and Albe, K. and Motylenko, M. and Rafaja, D. and Freudenberger, J.
Title: Origins of strength and plasticity in the precious metal based high-entropy alloy AuCuNiPdPt
Language: English
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.

Journal or Publication Title: Acta Materialia
Journal volume: 185
Publisher: Elsevier Ltd.
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Date Deposited: 22 Apr 2020 05:26
DOI: 10.1016/j.actamat.2019.12.020
Official URL: https://doi.org/10.1016/j.actamat.2019.12.020
Alternative keywords:
Alternative keywordsLanguage
High-entropy alloy, Solid solution, Microstructure, Deformation twinning, PlasticityUNSPECIFIED
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