Breakdown of Varvenne scaling in (AuNiPdPt)${}_{1-x}$ Cu${}_x$ high-entropy alloys

The compositional dependence of the yield strength σ${}_y$ has been studied for a series of polycrystalline (AuNiPdPt)${}_{1-x}$Cu${}_x$ alloys by means of compression tests. σ${}_y$ is found to decrease linearly with increasing Cu concentration. This behaviour is in contradiction to the generalised theory for solid solution strengthening in concentrated solid solutions provided by Varvenne et al. [1]. A breakdown of the scaling behaviour is found as σy should be non-linear and slightly increasing when modifying the composition from AuNiPdPt to AuCuNiPdPt.