Dresden 2026 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 35: Additive Manufacturing / Transport in Materials III

MM 35.6: Vortrag

Donnerstag, 12. März 2026, 17:00–17:15, SCH/A216

W diffusion in Mo-Ta alloys: temperature dependence and vacancy energetics — •Aditya Burla¹, Xiang Xu², Felix Kipke¹, Hartmut Bracht¹, Xi Zhang², Blazej Grabowski², Gerhard Wilde¹, and Sergiy V Divinski¹ — ¹Institut für Materialphysik, Universität Münster, 48149 Münster, Germany — ²Institut für Materialwissenschaft, Universität Stuttgart, 70569 Stuttgart, Germany

Refractory metals and their alloys have gained renewed attention with the emergence of high-entropy alloy concepts, driven by their exceptional properties at elevated temperatures. However, despite their technological significance, diffusion data for refractory binary systems remain sparse, limiting predictive understanding of defect-mediated transport at high temperatures. This study addresses this gap by investigating tungsten diffusion in the binary Mo-Ta system. Diffusion profiles were measured using secondary ion mass spectrometry after annealing in the temperature range of 1373K to 2273K. A key focus is on correlating the diffusion behavior with the vacancy formation energies. Complementary computational analysis provides atomistic insights, revealing composition-dependent variations in vacancy energetics within the Mo-Ta system. Its influence on W diffusivity and activation energies is discussed. This combined approach provides a comprehensive framework for understanding W diffusion and vacancy-controlled transport in Mo-Ta alloys, offering valuable guidance for the design of advanced refractory materials.

Keywords: refractory alloys; vacancy energetics; diffusion; secondary ion mass spectroscopy