Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 4: Structural Materials
MM 4.1: Vortrag
Montag, 5. September 2022, 10:15–10:30, H46
Nanoscale analysis of Ti-modified Mo-Si-B alloy to elucidate solid solution and particle strengthening — •Reshma Sonkusare1, Torben Boll1, Julia Becker2, Martin Heilmaier1, and Manja Krüger2 — 1Institute of Applied Materials and Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology, Germany — 2Institut für Werkstoff- und Fügetechnik, Otto-von-Guericke-Universität Magdeburg, Germany
Mo-Si-B alloys are attractive high-temperature structural materials due to their high melting point (>2000C), high-temperature strength and good oxidation resistance. We found that small additions of Ti to multi-phase Mo-Si-B lead to strengthening of alloy at intermediate and high temperatures. To understand the effect of Ti on microstructure and thus mechanical properties, we investigated powder metallurgically processed Mo-7.2Si-9.7B-1.7Ti. The microstructure consists of Mo solid solution phase, intermetallic silicide phases, nanoscale oxide and silicide particles. To analyze the composition of these nanoscopic particles, atom probe tomography is required. APT reveals Ti to cause an unexpected compositional change of Mo(SS) phase. This change and an analysis of the composition and distribution of other phases combined with an investigation of the particles and elemental segregations at the grain boundaries and inside the grains improve the understanding of the solid solution and particle strengthening in the alloy and hence the mechanical behavior.