Journal
MATERIALS RESEARCH LETTERS
Volume 7, Issue 7, Pages 267-274Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2019.1601644
Keywords
High entropy alloy; grain-growth; activation-energy; atom-Probe tomography
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Funding
- US Army Research Laboratory [W911NF-16-2-0189]
- University of North Texas [W911NF-16-2-0189]
- US Air Force Office of Scientific Research [FA9550-17-1-0395]
- National Science Foundation (NSF) DEMREF program [1435611]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1435611] Funding Source: National Science Foundation
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Experimental results reveal that the apparent activation-energy for grain-growth in an fcc-based AlxCoCrFeNi high entropy alloy (HEA) system increases from 179 to 486kJ/mol when the Al content increases from x=0.1 to 0.3. These unexpectedly high apparent activation-energy values can be potentially attributed to solute clustering within the fcc solid-solution phase that develops with increasing Al content in this HEA. Detailed microstructural analysis using atom-probe tomography and density functional theory (DFT) calculations strongly indicate the presence of such nanoscale clusters. This phenomenon can change grain-growth from a classical solute-drag regime to a much more sluggish cluster-drag based mechanism in these HEAs. [GRAPHICS] IMPACT STATEMENTFirst report on a composition dependent change in apparent activation-energy for grain-growth in high entropy alloys. A novel cluster drag effect inhibiting grain-growth kinetics is suggested.
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