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Effect of Al Content on Phase Compositions of FeNiCoCrMo 0.5 Al x High Entropy Alloy.
- Source :
- Metals (2075-4701); Nov2021, Vol. 11 Issue 11, p1734-1734, 1p
- Publication Year :
- 2021
-
Abstract
- The FeCoNiCrMo<subscript>0.5</subscript>Al<subscript>x</subscript> system with x up to 2.13 was analyzed from the point of view of evolution of the phase composition and microstructure. Cast samples were synthesized by induction melting and analyzed by X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy, and Vickers microhardness test methods. Phase compositions of these alloys in dependance on Al concentration consist of FCC solid solution, σ-phase, NiAl-based B2 phase, and BCC solid solution enriched with Mo and Cr. Phase formation principles were studied. Al dissolves in a FeCoNiCrMo<subscript>0.5</subscript> FCC solid solution up to 8 at.%.; at higher concentrations, Al attracts Ni, removing it from FCC solid solution and forming the B2 phase. Despite Al not participating in σ-phase formation, an increase in Al concentration to about 20 at.% leads to a growth in the σ-phase fraction. The increase in the σ-phase was caused by an increase in the amount of B2 because the solubility of σ-forming Mo and Cr in B2 was less than that in the FCC solution. A further increase in Al concentration led to an excess of Mo and Cr in the solution, which formed a disordered BCC solid solution. The hardness of the alloys attained the maximum of 630 HV at 22 and 32 at.% Al. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20754701
- Volume :
- 11
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Metals (2075-4701)
- Publication Type :
- Academic Journal
- Accession number :
- 153896279
- Full Text :
- https://doi.org/10.3390/met11111734