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SKM 2023 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 40: Mechanical Properties and Allloy Design

MM 40.9: Talk

Thursday, March 30, 2023, 18:00–18:15, SCH A 251

Solid solution strengthening in single-phase HEAs based on Au-Cu-Ni-Pd-Pt — •Sophie Drescher1, Jens Freudenberger1, Sascha Seils2, Alexander Kauffmann2, and Martin Heilmaier21Leibniz-IFW Dresden, Helmholtzstr. 20, 01099 Dresden, Germany — 2Karlsruhe Institute of Technology, Institute for Applied Materials, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany

Solid solution strengthening (SSS) is the dominant strengthening mechanism in High entropy alloys (HEAs). In contrast to dilute alloys,SSS of HEAs is yet not well understood. Therefore, it is necessary to develop reliable models to predict their mechanical properties. To verify such models experimental work is needed that illustrates the concentration-dependent solid solution strengthening of different alloys over a large composition range.

The high entropy alloy system Au-Cu-Ni-Pd-Pt is unique as it crystallizes in face-centered cubic crystal structure and is single-phase presumably within the entire concentration range. Hence, it serves a suitable benchmark system to investigate composition-dependent effects on the strength. In this study, it has been examined whether the model of Varvenne [1] is suitable to predict the SSS in this alloy system. The concentrations of individual elements were varied and the strength and hardness were evaluated. The model of Varvenne is misguiding the development of the strength in a large compositional range. However, the results give insights into the impact of different elements on the strength and can help to further enhance the model.

[1] C. Varvenne, et al., Acta Mater. 118 (2016) 164.

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