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- Title
Composition Dependence on the Evolution of Nanoeutectic in CoCrFeNiNb<sub><italic>x</italic></sub> (0.45 ≤ <italic>x</italic> ≤ 0.65) High Entropy Alloys.
- Authors
Chanda, Barnasree; Das, Jayanta
- Abstract
The effect of Nb addition in arc‐melted CoCrFeNiNb<italic>x</italic> (0.45 ≤ <italic>x</italic> ≤ 0.65) high entropy alloys (HEAs) on the phase evolution, stability, refinement of the microstructure, and mechanical properties are investigated. Minor fluctuation of Nb modifies the microstructure from hypoeutectic (<italic>x</italic> = 0.45) to eutectic (<italic>x</italic> = 0.5) and hypereutectic (<italic>x</italic> = 0.55) containing 134–200 nm thin nano‐lamellar FCC <italic>γ</italic>‐Ni and HCP Fe2Nb‐type Laves phases. The nano‐eutectic CoCrFeNiNb0.5 HEA shows high yield strength (2060 ± 5 MPa) and strain hardening up to 2200 ± 10 MPa with 17.0 ± 0.5% compressive plasticity. Transmission electron microscopic studies of partially deformed specimen has been revealed that the activity of dislocations is present in the eutectic FCC/Laves lamellae and at their interface. The stability of the phases in CoCrFeNiNbx and other eutectic HEAs as reported in the literature, has been assessed by estimating mixing entropy (Δ<italic>Smix</italic>), mixing enthalpy (Δ<italic>Hmix</italic>), atomic size differences (<italic>δ</italic>), valence electron concentration, Pauling electronegativity (Δ<italic>χP</italic>), and Allen electronegativity (Δ<italic>χA</italic>) to predict the evolution and coexistence of eutectic phases.
- Subjects
TRANSMISSION electron microscopy; CONDUCTION electrons; NIOBIUM alloys; ATOMIC radius; ELECTRONEGATIVITY; EUTECTIC reactions
- Publication
Advanced Engineering Materials, 2018, Vol 20, Issue 4, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.201700908