About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
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Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
ON DEMAND: An Experimental Study of the Effects of Deviations from AlCoCrFeNi Alloy Composition and Heat Treatment on the Microstructure, Phase Stability and Properties of Cast High Entropy Alloys |
Author(s) |
David J. Browne, Oisin Gavigan, Andrew G. Murphy, Mert Celikin |
On-Site Speaker (Planned) |
David J. Browne |
Abstract Scope |
Equal atomic parts AlCoCrFeNi and novel Al0.4CoCrFeNi1.6 and Al0.7CoCrFeNi1.3 high entropy alloy samples were fabricated, and cast into molds enabling various solidification rates. X-ray diffraction displayed single or dual phase consisting of FCC, BBC or ordered B2 phases in as-cast state.
Four Al0.7CoCrFeNi1.3 samples were studied in an as cast and annealed state, with annealing performed on three of the samples at 650°C, 800°C and 950°C for annealing times of three hours.
Average hardness of 277 HV across the four Al0.7CoCrFeNi1.3 samples in the as-cast condition was found to increase to within the range 545 to 1106 Hv post-annealing. Microscopy and energy dispersive X-ray spectroscopy revealed an increase in elemental segregation following annealing due to a corresponding increase in the ordering of the systems with the precipitation of Ni and Al rich B2 acicular like needle and larger globular precipitates along with the Cr rich 𝜎 phase being observed. |
Proceedings Inclusion? |
Undecided |