Microstructure and mechanical properties of a laser-based directed energy deposited Mo-Si-Ti alloy

Schliephake D, Ramdoss SR, Vikram RJ, Falcão G, Galgon F, Thota H, Hinrichs F, Zenk C, Kauffmann A, Eggeler Y, Suwas S, Schwaiger R, Heilmaier M (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Journal of Materials Science Springer Verlag (Germany)

DOI: 10.1007/s10853-025-11158-0

Abstract

This study focuses on the linkage between microstructure and mechanical properties at elevated temperatures of a Mo-20Si-52.8Ti (at.%) eutectic alloy produced by directed energy laser deposition (DED-LB). The alloy consists of a body centered cubic solid solution (Mo,Ti,Si)ss and a hexagonal (Ti,Mo)5Si3 phase. In addition, a conventional as-cast (AC) alloy with subsequent heat treatment (HT) to further coarsen the microstructure is investigated to rationalize the effect of microstructural length scale on mechanical properties by DED-LB. The fine microstructure produced by DED-LB has a significant effect on the 0.2% offset yield strength at 900 °C compared to AC and HT. This was found to be mainly due to the depletion of Si in (Mo,Ti,Si)ss and to the creep contribution caused by the high phase boundary density. By contrast, the effect of interstitial O contamination and texture formation in the (Ti,Mo)5Si3 phase is excluded as a reason of the difference in 0.2% offset yield strength compared to AC and HT.

Authors with CRIS profile

Florian Galgon Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle) (WTM) Christopher Zenk Sonderforschungsbereich/Transregio 103 Vom Atom zur Turbinenschaufel - wissenschaftliche Grundlagen für eine neue Generation einkristalliner Superlegierungen

Involved external institutions

Karlsruhe Institute of Technology (KIT) DE Germany (DE) Indian Institute of Science (IISc) IN India (IN) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Schliephake, D., Ramdoss, S.R., Vikram, R.J., Falcão, G., Galgon, F., Thota, H.,... Heilmaier, M. (2025). Microstructure and mechanical properties of a laser-based directed energy deposited Mo-Si-Ti alloy. Journal of Materials Science. https://doi.org/10.1007/s10853-025-11158-0

MLA:

Schliephake, Daniel, et al. "Microstructure and mechanical properties of a laser-based directed energy deposited Mo-Si-Ti alloy." Journal of Materials Science (2025).

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