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<p>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)<sub>ss</sub> and a hexagonal (Ti,Mo)<sub>5</sub>Si<sub>3</sub> 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&#xa0;°C compared to AC and HT. This was found to be mainly due to the depletion of Si in (Mo,Ti,Si)<sub>ss</sub> 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)<sub>5</sub>Si<sub>3</sub> phase is excluded as a reason of the difference in 0.2% offset yield strength compared to AC and HT.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月8日

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  • Daniel Schliephake,
  • Sri R. Ramdoss,
  • R. J. Vikram,
  • Gabriely Falcão,
  • Florian Galgon,
  • Hemanth Thota,
  • Frauke Hinrichs,
  • Christopher Zenk,
  • Alexander Kauffmann,
  • Yolita Eggeler,
  • Satyam Suwas,
  • Ruth Schwaiger,
  • Martin Heilmaier

摘要

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.