Achieving high strength and ductility in Fe50Mn25Ni10Cr15 medium entropy alloy via Al alloying

doi:10.1016/j.jmst.2021.04.068

Abstract

Abstract:

The microstructure and tensile properties of (Fe₅₀Mn₂₅Ni₁₀Cr₁₅)_100-_xAl_x (x = 0-8 at.%) medium-entropy alloys (MEAs) were investigated. It was found that the crystalline structure changes from face-centered cubic (FCC) single phase to FCC+ body-centered cubic (BCC) dual-phase with the increase of Al content. Therefore, the addition of Al elements with large atomic size could induce solid solution strengthening and dual-phase heterogeneous structure strengthening. Correspondingly, the present MEAs exhibit excellent combinations of yield strength, ultimate tensile strength (UTS) and ductility both at 298 and 77 K. Among the MEAs, the (Fe₅₀Mn₂₅Ni₁₀Cr₁₅)₉₅Al₅ alloy has a remarkable combination of cryogenic UTS (1077 MPa) and ductility (~85%), and has lower raw material costs than the reported high-entropy alloys (HEAs) and MEAs. The correlation among microstructure and mechanical properties and the corresponding strengthening mechanism were clarified.

Key words: Medium entropy alloys, Microstructure, Mechanical properties, Cryogenic temperature

Zhen Jiang, Ran Wei, Wenzhou Wang, Mengjia Li, Zhenhua Han, Shuhan Yuan, Kaisheng Zhang, Chen Chen, Tan Wang, Fushan Li. Achieving high strength and ductility in Fe₅₀Mn₂₅Ni₁₀Cr₁₅ medium entropy alloy via Al alloying[J]. J. Mater. Sci. Technol., 2022, 100: 20-26.

Figures/Tables 8

Fig. 1. (a) XRD patterns from the (Fe50Mn25Ni10Cr15)100-xAlx samples, indicating a phase transition from FCC to BCC structure, and (b) the corresponding lattice constant of FCC and BCC structure.

Table 1 The volume fraction of FCC and BCC phase in Al5 and Al7 MEA calculated by XRD.

Phase	Al5	Al5 after fracture at 77 K	Al7	Al7 after fracture at 77 K
FCC	91.6%	92%	80%	79.8%
BCC	8.4%	8%	20%	20.2%

Fig. 2. Initial microstructures of Al5 and Al7 alloys: (a, d) EBSD IPF, (b, e) phase, and (c, e) KAM maps.

Fig. 3. (a) Typical tensile engineering stress-strain curves for (Fe50Mn25Ni10Cr15)100-xAlx alloys at 298 K and 77 K, and (b) strain hardening rate-true strain curves for Al5 and Al7 MEAs. (c) Comparison of the UTS versus ductility at 77 K obtained in this work with other selected alloys [12, [21], [22], [23], [31], [32], [33]]. (d) Lower raw material price of both studied Al5 and Al7 MEAs together with other alloys.

Table 2 Yield strength (YS), ultimate tensile strength (UTS), ductility and UTS × ductility of the (Fe50Mn25Ni10Cr15)100-xAlx alloys.

Sample		YS (MPa)	UTS (MPa)	Ductility (%)	UTS × ductility (GPa %)
Al0	298 K	257	492	47	23
Al0	77 K	460	936	89	83
Al3	298 K	356	603	53	32
Al3	77 K	557	1014	87	88
Al5	298 K	396	653	50	33
Al5	77 K	560	1077	85	92
Al6	298 K	480	724	40	29
Al6	77 K	719	1092	58	63
Al7	298 K	680	852	32	27
Al7	77 K	860	1134	23	26

Fig. 4. Fracture surfaces of (a, b) Al5 and (c, d) Al7 alloys at 298 K and 77 K, respectively.

Fig. 5. XRD patterns for Al5 and Al7 MEAs after tensile fracture at 298 K and 77 K.

Fig. 6. The microstructures of Al5 and Al7 alloys after fractured at 77 K. (a, c) EBSD phase and (b, d) KAM maps.

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Achieving high strength and ductility in Fe₅₀Mn₂₅Ni₁₀Cr₁₅ medium entropy alloy via Al alloying

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