On the orientation-dependent mechanical properties of interstitial solute-strengthened Fe49.5Mn30Co10Cr10C0.5 high entropy alloy produced by directed energy deposition

Ali Chabok, Wei Zhang, Jiajia Shen, J. P. Oliveira, Hui Wang, Shaochuan Feng, Nobert Schell, Bart J. Kooi, Yutao Pei

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
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Abstract

Interstitial solute-strengthened Fe49.5Mn30Cr10Co10C0.5 (at%) high entropy alloy was additively manufactured by directed energy deposition (DED) process in this work. While the as-deposited material exhibits an excellent combination of strength and ductility, the effect of anisotropy on the mechanical performance of the DED processed component was studied in detail. The ultimate tensile strength (UTS) of the horizontal tensile sample with a main fiber texture of <111> // tensile direction (TD) went up to 1 GPa while maintaining a superb failure elongation of 36%. The vertical tensile sample, with a dominant <001> // TD texture, failed at an UTS of 750 MPa with an enhanced failure elongation of 52%. Microstructural analysis of the deformed samples showed that the horizontal samples were mainly deformed via the formation of mechanical twins, whereas the twining activity was less profound in the vertical samples. Single crystal micro-pillar compression testing revealed that the deformation mechanism complies well with the Schmid's factor. In addition, a higher critical resolved shear stress for twining compared to slip was also confirmed in the micro-pillar compression testing.
Original languageEnglish
Article number103914
Number of pages17
JournalAdditive Manufacturing
Volume79
DOIs
Publication statusPublished - 5 Jan 2024

Keywords

  • Deformation mechanisms
  • Directed energy deposition
  • High entropy alloy
  • Interstitial solute strengthening
  • Mechanical properties
  • Precipitation strengthening

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