Tunability of the mechanical properties of (Fe50Mn27Ni10Cr13)100-xMox high-entropy alloys via secondary phase control. (20th May 2021)

• Record Type: Journal Article
• Authors: Nutor, Raymond Kwesi; Cao, Q.P.; Wang, X.D.; Zhang, D.X.; Jiang, J.Z.
• Is Part Of: Journal of materials science & technology. Volume 73(2021)
• Page Start: 210
• Page End: 217
• Publication Date: 2021-05-20
• Subjects: High-entropy alloys -- Mechanical property -- TEM; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.09.029
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: The single-phase face-centered cubic (fcc)-structured Fe50 Mn27 Ni10 Cr13 high entropy alloy (HEA) exhibits good ductility but low strength, which presents a challenge. By Mo-alloying and thermomechanical treatments, we have designed the (Fe50 Mn27 Ni10 Cr13 )100- x Mo x ( x = 0–6 at.%) alloy series with a wide range of mechanical properties. The careful control of secondary phases introduced in the cold-rolled and annealed (Fe50 Mn27 Ni10 Cr13 )Mo2 sample resulted in an enhanced tensile strength from 250 MPa to 665 MPa, still having ∼25 % ductility. TEM investigations of this alloy revealed the presence of deformation twins, dislocation cells, and ordered bcc nano-particles embedded in the ductile fcc matrix post-deformation. The observed deformation structures are an indication of successful cooperation between deformation twinning and precipitation strengthening in enhancing the tensile strength at maintained ductility compared to its cast counterpart. This work provides insight into the tunability of the mechanical properties of non-equiatomic HEAs via alloying and thermomechanical processing.