Deformation behavior of a Co-Cr-Fe-Ni-Mo medium-entropy alloy at extremely low temperatures

Moon, Jongun; Tabachnikova, E. D.; Шумилин, С. Э.; Hryhorova, T. V.; Estrin, Yuri; Brechtl, Jamieson; Liaw, Peter K.; Wang, Wenqing; Dahmen, Karin A.; Zargaran, Alireza; Bae, Jae Wung; Seok, Hyeon Seok; Lee, Byeong-Joo; Kim, Hyoung Seop

doi:10.1016/j.mattod.2021.08.001

Cited by 66 publications

(26 citation statements)

References 61 publications

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“…After cold rolling, the yield strength increases to 920 MPa. Although the subsequent annealing at 600 °C for 2 h further strengthens the alloy, it simultaneously induces brittleness, similar to the results of Gu et al [21] . High-temperature annealing will generally soften an alloy significantly, accompanied by a decrease in yield strength but an increase in ductility.…”

Section: Mechanical Properties Of Heasupporting

confidence: 88%

High strength and ductility in partially recrystallized Fe40Mn20Cr20Ni20 high-entropy alloys at cryogenic temperature

Ma¹,

Yang²,

Wang³

et al. 2022

Microstructures

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The effects of cold rolling and subsequent annealing on the microstructures and mechanical properties of Fe40Mn20Cr20Ni20 high-entropy alloys (HEAs) are investigated. The Cr-rich secondary phases with a tetragonal structure (σ phases) in the Fe40Mn20Cr20Ni20 HEAs are precipitated upon annealing at 600 °C-900 °C for 2 h. The prepared Fe40Mn20Cr20Ni20 HEA annealed at 800 °C for 2 h after cold rolling has a good combination of strength and elongation, with a high yield strength of 438 MPa, a high ultimate tensile strength of 676 MPa, and an excellent elongation to fracture of 32%. The mechanical properties at cryogenic temperature are better than those at room temperature. Typically, for the incompletely recrystallized alloy annealed at 700 °C, the yield strength, tensile strength, and elongation after fracture are increased by 26%, 22%, and 100%, respectively. This trend mainly depends on dislocation and twinning strengthening. The σ phases also improve the cryogenic tensile properties. Furthermore, the recrystallization kinetics of the Fe40Mn20Cr20Ni20 HEAs are explored to correlate with the deformation behavior.

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Section: Mechanical Properties Of Heasupporting

confidence: 88%

High strength and ductility in partially recrystallized Fe40Mn20Cr20Ni20 high-entropy alloys at cryogenic temperature

Ma¹,

Yang²,

Wang³

et al. 2022

Microstructures

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“…Comparison of the d) yield strength and e) tensile strength versus ductility at 77 K obtained in this work with other selected alloys with low Co content. [ 1,9,16,25–36 ] Reproduced with permission. [ 1 ] Copyright 2018, Springer Nature.…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that the ductility of the H/MEAs is significantly reduced at cryogenic temperature by interstitial strengthening, such as doping interstitial C or B elements. [2,4] [1,9,16,[25][26][27][28][29][30][31][32][33][34][35][36] Reproduced with permission. [1] Copyright 2018, Springer Nature.…”

Section: Resultsmentioning

confidence: 99%

“…b) Engineering stress-strain curves of the medium-entropy alloys (MEAs) during tensile deformation at 298 and 77 K. c) Strain-hardening rate-true strain curves of the MEAs. Comparison of the d) yield strength and e) tensile strength versus ductility at 77 K obtained in this work with other selected alloys with low Co content [1,9,16,[25][26][27][28][29][30][31][32][33][34][35][36]. Reproduced with permission [1].…”

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Strengthening of Fe₅₀Mn₂₅Ni₁₀Cr₁₅ Medium‐Entropy Alloys by Mo Addition for Cryogenic Applications

et al. 2022

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The effect of Mo addition of Fe 50 Mn 25 Ni 10 Cr 15 medium-entropy alloy (MEA) on its cryogenic mechanical properties is investigated. It is found that the optimized (Fe 50 Mn 25 Ni 10 Cr 15 ) 99.5 Mo 0.5 MEA exposes the yield strength, tensile strength, and ductility of 690 MPa, 1148 MPa, and 63% at 77 K, respectively. Especially, the yield strength increases by 29% after Mo addition. Herein, the solid-solution strengthening, twinning-induced plasticity, and transformation-induced plasticity are beneficial to reveal the high work hardening capability and good strengthductility synergy at 77 K. This research can offer guidance for the design of lowcost and high-performance MEAs for cryogenic applications.

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Cyclic Stability of Ni_44.8Cu₅Ti_45.2Hf₅ and Zr‐Substituted Ni_44.8Cu₅Ti_40.2Hf₅Zr₅ Medium‐Entropy Shape Memory Alloys

et al. 2022

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An experimental investigation on the cyclic stability of solutionized Ni44.8Cu5Ti45.2Hf5 and Zr‐substituted Ni44.8Cu5Ti40.2Hf5Zr5 (atomic percent, at%) medium‐entropy shape memory alloys (MESMAs) was carried out. The shift of the peak temperature for the forward B2B19′ transformation in Ni44.8Cu5Ti45.2Hf5 alloy after 50 differential scanning calorimetry (DSC) cycles was measured to be 23 °C, substituting 5 at% Zr for Ti increased it to 41 °C. No residual strain accumulation was observed in Ni44.8Cu5Ti45.2Hf5 alloy after 10 thermal cycles under a tensile stress of 200 MPa, and meanwhile the shape memory strain increased from 5% to 6.5%. A pseudoelastic strain (εPE) of ≈2.7% was obtained in Zr‐substituted Ni44.8Cu5Ti40.2Hf5Zr5 alloy at 55 °C (Af + 10 °C) for a maximum deformation (εmax.) of 4.4%. In addition, the stability of pseudoelasticity in Ni44.8Cu5Ti40.2Hf5Zr5 alloy during 100 loading–unloading cycles was examined in the solution annealed (1000 °C for 1 h) and aged (400 °C for 1 h) conditions. The results showed that aging treatment could effectively retard the degradation of pseudoelasticity in the alloy. These preliminary findings suggest that the idea of increasing chemical complexity in NiTi‐based SMAs holds promising potential in developing novel SMAs with enhanced cyclic stability.

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Deformation behavior of a Co-Cr-Fe-Ni-Mo medium-entropy alloy at extremely low temperatures

Cited by 66 publications

References 61 publications

High strength and ductility in partially recrystallized Fe40Mn20Cr20Ni20 high-entropy alloys at cryogenic temperature

High strength and ductility in partially recrystallized Fe40Mn20Cr20Ni20 high-entropy alloys at cryogenic temperature

Strengthening of Fe₅₀Mn₂₅Ni₁₀Cr₁₅ Medium‐Entropy Alloys by Mo Addition for Cryogenic Applications

Cyclic Stability of Ni_44.8Cu₅Ti_45.2Hf₅ and Zr‐Substituted Ni_44.8Cu₅Ti_40.2Hf₅Zr₅ Medium‐Entropy Shape Memory Alloys

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Deformation behavior of a Co-Cr-Fe-Ni-Mo medium-entropy alloy at extremely low temperatures

Cited by 66 publications

References 61 publications

High strength and ductility in partially recrystallized Fe40Mn20Cr20Ni20 high-entropy alloys at cryogenic temperature

High strength and ductility in partially recrystallized Fe40Mn20Cr20Ni20 high-entropy alloys at cryogenic temperature

Strengthening of Fe50Mn25Ni10Cr15 Medium‐Entropy Alloys by Mo Addition for Cryogenic Applications

Cyclic Stability of Ni44.8Cu5Ti45.2Hf5 and Zr‐Substituted Ni44.8Cu5Ti40.2Hf5Zr5 Medium‐Entropy Shape Memory Alloys

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Product

Resources

About

Strengthening of Fe₅₀Mn₂₅Ni₁₀Cr₁₅ Medium‐Entropy Alloys by Mo Addition for Cryogenic Applications

Cyclic Stability of Ni_44.8Cu₅Ti_45.2Hf₅ and Zr‐Substituted Ni_44.8Cu₅Ti_40.2Hf₅Zr₅ Medium‐Entropy Shape Memory Alloys