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MM: Fachverband Metall- und Materialphysik
MM 60: Mechanical Properties: Plasticity, fracture, fatigue, wear - I
MM 60.2: Vortrag
Donnerstag, 19. März 2020, 16:00–16:15, IFW B
Variation of mechanical strength with composition in the Cantor alloy system: Experiments and modeling — •Daniel Utt1, Tom Keil2, Alexander Stukowski1, Enrico Bruder2, Karsten Albe1, and Karsten Durst2 — 1Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, Technische Universität Darmstadt, Germany — 2Fachgebiet Physikalische Metallkunde, Institut für Materialwissenschaft, Technische Universität Darmstadt, Germany
We investigate the concentration dependent mechanical properties of the Cantor high-entropy alloy (HEA) system over a wide concentration range and aim to understand the influence of the different chemical elements on the alloy’s strength and phase stability. The investigated samples are the different subsystems of the HEA, where one element of the alloy is enriched, while the others are decreased using diffusion couple samples of the HEA and each of its constituents.
The concentration gradient in the interdiffusion zone allows us to determine the concentration dependent phase stability and solid solution strengthening (SSS). Here, the phase stability is measured using electron backscatter diffraction and compared to thermo-calc predictions. The strength of the alloy is determined by nanoindentation hardness measurements. The resulting SSS is described using two models. The Labusch model does not have predictive power but it reveals that Cr is the most potent strengthener. The Varvenne model describes the concentration dependent SSS in the Cantor alloy system well for all investigated diffusion couples.