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

Frank, Michael; Nene, Saurabh S.; Chen, Yan; Gwalani, Bharat; Kautz, Elizabeth J.; Devaraj, Arun; An, Ke; Mishra, Rajiv S.

doi:10.1038/s41598-020-79492-8

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

Journal Article · Thu Dec 17 00:00:00 EST 2020 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-020-79492-8· OSTI ID:1752964

Frank, Michael ^[1]; Nene, Saurabh S. ^[2]; Chen, Yan ^[3]; ^[4]; Kautz, Elizabeth J. ^[4]; ^[4]; An, Ke ^[3]; Mishra, Rajiv S. ^[1]

Univ. of North Texas, Denton, TX (United States)
Univ. of North Texas, Denton, TX (United States); Indian Inst. of Technology (IIT), Jodhpur (India)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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 ~ 6.31 mJ m^–2. Cooperative activation of multiple mechanisms was indicated by increases in SF strengthening and γ-f.c.c. → ε-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.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: US Army Research Laboratory (USARL); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1752964

Report Number(s):: PNNL-SA--157863

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 10; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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