Tunability of the mechanical properties of (Fe50Mn27Ni10Cr13)100-xMox high-entropy alloys via secondary phase control

doi:10.1016/j.jmst.2020.09.029

Abstract

Abstract:

The single-phase face-centered cubic (fcc)-structured Fe₅₀Mn₂₇Ni₁₀Cr₁₃ high entropy alloy (HEA) exhibits good ductility but low strength, which presents a challenge. By Mo-alloying and thermomechanical treatments, we have designed the (Fe₅₀Mn₂₇Ni₁₀Cr₁₃)_100-_xMo_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 (Fe₅₀Mn₂₇Ni₁₀Cr₁₃)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.

Key words: High-entropy alloys, Mechanical property, TEM

Raymond Kwesi Nutor, Q.P. Cao, X.D. Wang, D.X. Zhang, J.Z. Jiang. Tunability of the mechanical properties of (Fe₅₀Mn₂₇Ni₁₀Cr₁₃)_100-_xMo_x high-entropy alloys via secondary phase control[J]. J. Mater. Sci. Technol., 2021, 73: 210-217.

Figures/Tables 10

Fig. 1. (a) XRD patterns and (b) lattice parameters of the (Fe50Mn27Ni10Cr13)100-xMox (x = 0, 2, 4, 6 at.%) HEAs.

Fig. 2. (a) Typical engineering stress-strain, (b) true stress - true strain, (c) strain-hardening rate-true strain, and (d) variations in the strain-hardening exponent of the prepared (Fe50Mn27Ni10Cr13)100-xMox (x = 0, 2, 4, 6 at.%) HEAs.

Table 1 Room temperature mechanical properties of (Fe50Mn27Ni10Cr13)100-xMox (x = 0, 2, 4, 6 at.%) HEAs.

Alloys	Yield strength (MPa)	Ultimate tensile strength (MPa)	Elongation (%)
ASC Mo₀	90	250	40
RA Mo₀	205	463	42
ASC Mo₂	215	387	25.3
RA Mo₂	405	665	24
ASC Mo₄	295	455	11.3
RA Mo₄	575	658	6.2
ASC Mo₆	450	465	2.5

Fig. 3. Fracture morphologies of (a) ASC Mo0, (b) RA Mo0, (c) ASC Mo2, (d) RA Mo2, (e) ASC Mo4, and (f) RA Mo4 samples.

Fig. 4. BSE SEM images of (a) ASC Mo0, (b) RA Mo0, (c) ASC Mo2, (d) RA Mo2, (e) ASC Mo4, and (f) RA Mo4 specimens.

Table 2 SEM-EDX chemical compositions in at.% at various regions of the samples.

Alloy	Region	Fe	Mn	Ni	Cr	Mo
ASC Mo₀	fcc	49.8	26.4	11.1	12.7
RA Mo₀	fcc	50.0	26.6	10.7	12.7
ASC Mo₂	A	48.5	26.3	10.0	13.0	2.2
ASC Mo₂	B	45.8	23.5	5.1	20.1	5.6
RA Mo₂	A	49.7	25.6	9.3	13.2	2.3
RA Mo₂	B	46.5	22.2	4.3	21.1	5.8
ASC Mo₄	A	48.7	25.7	10.5	11.2	4.0
ASC Mo₄	B	45.0	22.5	4.1	17.2	11.1
RA Mo₄	A	48.8	25.8	9.5	11.5	4.3
RA Mo₄	B	45.6	23.4	5.6	15.6	9.7

Fig. 5. Bright-field TEM images of and corresponding SAED patterns of the RA Mo2 specimen at different magnifications (lime green arrows: dislocations, blue arrows: annealing twins).

Fig. 6. TEM-EDX elemental maps of constituent phases in RA Mo2 sample.

Fig. 7. (a) BF-TEM image, and SAED patterns of (b) twin region, (c) B2 nanoparticles of RA Mo2 specimen deformed to failure showing nano-twins and intermetallic particle (red arrows: nanotwins, and yellow arrows: dislocations).

Table 3 Summary of mixing entropy (ΔSmix), electronegativity (Δχ), and valence electron concentration (VEC).

Alloys	ΔS_mix (J/(mol K))	Δχ	VEC
Fe₅₀Mn₂₇Ni₁₀Cr₁₃	9.94	0.1322	7.67
(Fe₅₀Mn₂₇Ni₁₀Cr₁₃)₉₈Mo₂	10.56	0.1435	7.6366
(Fe₅₀Mn₂₇Ni₁₀Cr₁₃)₉₆Mo₄	10.94	0.1535	7.6032
(Fe₅₀Mn₂₇Ni₁₀Cr₁₃)₉₄Mo₆	11.23	0.1625	7.5698

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Tunability of the mechanical properties of (Fe₅₀Mn₂₇Ni₁₀Cr₁₃)_100-_xMo_x high-entropy alloys via secondary phase control

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