4.7 Article

Correlating work hardening with co-activation of stacking fault strengthening and transformation in a high entropy alloy using in-situ neutron diffraction

Journal

SCIENTIFIC REPORTS
Volume 10, Issue 1, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41598-020-79492-8

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Funding

  1. Army Research Laboratory (ARL) [W911NF-18-2-0067]
  2. University of North Texas [W911NF-18-2-0067]
  3. Scientific User Facilities Division, Office of Basic Energy Sciences
  4. Laboratory directed research and development from Pacific northwest National Laboratory as a part of Solid phase processing science initiative
  5. Department of Energy Office of Science Graduate Research Program

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Transformation induced plasticity (TRIP) leads to enhancements in ductility in low stacking fault energy (SFE) alloys, however to achieve an unconventional increase in strength simultaneously, there must be barriers to dislocation motion. While stacking faults (SFs) contribute to strengthening by impeding dislocation motion, the contribution of SF strengthening to work hardening during deformation is not well understood; as compared to dislocation slip, twinning induced plasticity (TWIP) and TRIP. Thus, we used in-situ neutron diffraction to correlate SF strengthening to work hardening behavior in a low SFE Fe40Mn20Cr15Co20Si5 (at%) high entropy alloy, SFE similar to 6.31 mJ m(-2). Cooperative activation of multiple mechanisms was indicated by increases in SF strengthening and gamma-f.c.c.->epsilon-h.c.p. transformation leading to a simultaneous increase in strength and ductility. The present study demonstrates the application of in-situ, neutron or X-ray, diffraction techniques to correlating SF strengthening to work hardening.

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