Seria: Wykład

Prelegent i afiliacja: Dr. Francesco Maresca, Engineering and Technology Institute Groningen, Faculty of Science and Engineering, University of Groningen, 9747 AG Groningen, The Netherlands

Data: wt., 2024-02-20 13:00 do 14:30

Miejsce:  https://meet.goto.com/NCBJmeetings/nomaten-seminar

Streszczenie: 

Body-centered-cubic (BCC) high entropy alloys show exceptional strengths up to 1900K [1]. Fundamental understanding of the mechanisms that control strengthening is necessary to formulate a theory that enables screening over the immense compositional HEA space [2]. Supported by experimental findings in NbTaTiV and CrMoNbV alloys [3], we show with theory [4] that edge dislocations can control the yield strength in BCC high entropy alloys [3]. The theory of edge dislocation strengthening is based on the interaction of the edge dislocations with the random field of solutes in the HEAs. The theory rationalizes and captures a broad range of experiments on BCC alloys. The theory is cast in an analytical form that is parameter-free and depends on physical quantities (alloy concentrations, lattice parameter, elastic constants, misfit volumes) that can be determined ab-initio or experimentally. The reduced theory enables screening over 10 million compositions in the whole Al-Cr-Mo-Nb-Ta-W-V-Ti-Zr-Hf alloy family to find the strongest BCC HEAs.

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