Ductile-brittle transition of carbon alloyed Fe40Mn40Co10Cr10 high entropy alloys

Chen, L.B.; Wei, Ran; Tang, Kai; Zhang, J.; Jiang, F.; Sun, Jun

doi:10.1016/j.matlet.2018.10.144

Cited by 47 publications

(12 citation statements)

References 18 publications

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“…Due to the TRIP effect and corresponding dynamic Hall-Petch strengthening, the alloy attained a rather high ultimate tensile strength (up to 960 MPa) and substantial total elongation (80% in the initial condition and 68% after 600-100 FSW, Figure 6c and Table 3). Deformation-induced martensitic transformation in similar alloys was also observed earlier in [13,42]. At the same time, the carbon-free Fe 50 Mn 30 Co 10 Cr 10 alloy [13] demonstrated a noticeably higher ultimate tensile strength (1400 MPa) but a lower value of elongation (45%).…”

Section: Discussionsupporting

confidence: 74%

Friction Stir Welding of a TRIP Fe49Mn30Cr10Co10C1 High Entropy Alloy

Shaysultanov

Raimov

Stepanov

et al. 2020

Metals

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The effect of friction stir welding parameters on the structure and properties of Fe49Mn30Cr10Co10C1 high-entropy alloy welds was studied. Due to the development of the TRIP effect, the mechanical behaviour of this alloy was associated with the γ fcc-to-ε hcp martensitic transformation. In the initial condition, the microstructure of the program alloy comprised equiaxed fcc grains and small fractions of the hcp ε-martensite (~5%) and M23C6 carbides (~4%). Friction stir welding of the program alloy resulted in recrystallization of the stir zone and a decrease in the fraction of the carbides to 1–2%; however, the percentage of the hcp phase remained at nearly the same level as that in the initial condition. Post-welding tests showed a considerable increase in the strength and microhardness of the welds both due to the recrystallization-induced decrease in grain size and martensitic transformation.

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Section: Discussionsupporting

confidence: 74%

Friction Stir Welding of a TRIP Fe49Mn30Cr10Co10C1 High Entropy Alloy

Shaysultanov

Raimov

Stepanov

et al. 2020

Metals

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“…CoCrFeMnNiC0.1 [41], Fe40Mn40Co10Cr10 [44], Al0.25CoCrFe1.25Ni1.25 [45]) are very ductile but their mechanical strength are very low. Compared to other dual-phase FCC + BCC HEAs such as AlCoCrFeNi2.1 [46], Fe20Co20Ni41Al19 [47], Al10(CoCrFeMnNi)90 [48], and Al11(CoCrFeMnNi)89 [48], the present Al0.6CoCrFeNi HEA has lower yield stress and larger elongation, but overall their mechanical properties are similar.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…In contrast, those BCC refractory HEAs (e.g., HfNbZrTi[36], HfNbTaTiZr[37], AlCoCrFeNi[38] and Ti 35 Zr 27.5 Hf 27.5 Nb 5 Ta 5[39]) have higher yield stress but with much lower ductility than Al 0.6 CoCrFeNi. On the other hand, those FCC HEAs (e.g., CoCrFeNi[40], CoCrFeMnNi[41], Al 0.3 CoCrFeNi[42], Al 0.5 CrCuFeNi 2[43], CoCrFeMnNiC 0.1[41], Fe 40 Mn 40 Co 10 Cr 10[44], Al 0.25 CoCrFe 1.25 Ni 1.25[45]) are very ductile but their mechanical strength are very low. Compared to other dual-phase FCC + BCC HEAs such as AlCoCrFeNi 2.1[46], Fe 20 Co 20 Ni 41 Al 19[47], Al 10 (CoCrFeMnNi) 90[48], and Al 11 (CoCrFeMnNi) 89[48], the present Al 0.6 CoCrFeNi HEA has lower yield stress and larger elongation, but overall their mechanical properties are similar.…”

mentioning

confidence: 99%

Optimize the Mechanical Properties of Al0.6CoCrFeNi High-Entropy Alloys by Thermo-Mechanical Processing

Yang

Tan

Qiao

et al. 2022

Metals

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The phase stability, microstructural evolution, and mechanical properties of Al0.6CoCrFeNi high-entropy alloy (HEA) subjected to different thermo-mechanical treatments were systematically investigated in the present study. The face center cubic (FCC) matrix, B2, and minor Body Center Cubic (BCC) phases were observed in the as-cast state. The morphology of the B2 precipitates evolved from needle-like to droplet-shaped when annealed at 900 °C, 1000 °C, and 1100 °C. The resulting yield stress of this FCC/B2 duplex-phase HEA after annealing heat treatments was successfully analyzed based on the contributions from solid solution strengthening, precipitate strengthening, grain boundary hardening, and dislocation hardening.

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“…[124] To date, only some conventional alloys are viable for liquid-helium-temperature applications, most of which are fcc structured. [231][232][233][234][235][236] Just as in conventional alloys, some fccstructured HEAs [21,124,237,238] have shown great potential for cryogenic applications. This is seen first hand in Figure 13, where the FeCoNiCrMn and FeCoNiCr HEAs exhibit an enhancement in their mechanical response with decreasing temperatures.…”

Section: Overcoming the "Strength-ductility Trade-off"mentioning

confidence: 99%

Phase Selection, Lattice Distortions, and Mechanical Properties in High‐Entropy Alloys

et al. 2020

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Increasing demand for improved physical, chemical, and mechanical properties led to the development of conventional alloys from single elements. These conventional alloys are made by selecting one or two major elements with desired properties, and other minor components are added to tune the properties to meet performance specifications. The conventional alloy design strategy is mainly based on the "solutesolvent" principle. However, another alloy design strategy based on multiprincipal elements in the near-equimolar ratio has recently been developed. In this multiprincipal element system, it is difficult to distinguish between the solute and the solvent, and various atoms are supposed to be randomly distributed in the crystal lattices (which has not been confirmed yet). This strategy, proposed by Yeh [1] and Cantor, [2] was based on the Boltzmann hypothesis of the relationship between entropy and system complexity. They proposed that the increased configurational entropy of mixing in alloys with multiple alloying elements in near-equiatomic proportions would overcome the enthalpy of compound formation, stabilizing solid solutions (SS) at the expense of intermetallics (IMs) during solidification. These multiprincipal element alloys are named "high entropy alloys" (HEAs), although the exact values of entropy in HEAs have not been experimentally measured yet. Since then, hundreds of HEAs with different combinations have been developed based on transition metals, refractory metals, and compound forming elements. [2-20] Most of these HEAs have been found to possess simple crystal structures such as the face-centered cubic (fcc) Fe-Co-Cr-Mn-Ni HEAs, [2] bodycentered cubic (bcc) Al-Co-Cr-Fe-Ni HEAs, [18] and the hexagonal close-pack (hcp) Ho-Dy-Y-Gd-Tb HEAs [6] when solidified from the melts. Experimental characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), nanoindentation, tensile, wear-and corrosionresistance tests have been used to study the microstructureproperties correlations of HEAs. [3-50] These studies have revealed that HEAs possess superior properties, such as high hardness and strength, [23-29] superior corrosion and wear resistance, [3,30-35] good magnetic properties, [9,36-39,51] structural stability, [7,40,41] attractive mechanical properties at extreme temperature conditions, [21,42-47] and good electronic properties. [48,49] Yeh [50] proposed four core effects of HEAs, namely: 1) high-entropy effect; 2) sluggish diffusion effect; 3) sever lattice distortion effect; and 4) cocktail effect, in which the lattice distortion might be the key factor affecting the properties of HEAs. Although a complete understanding of lattice distortions in HEAs is still not established yet, significant progress in HEAs has been made recently.

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Ductile-brittle transition of carbon alloyed Fe40Mn40Co10Cr10 high entropy alloys

Cited by 47 publications

References 18 publications

Friction Stir Welding of a TRIP Fe49Mn30Cr10Co10C1 High Entropy Alloy

Friction Stir Welding of a TRIP Fe49Mn30Cr10Co10C1 High Entropy Alloy

Optimize the Mechanical Properties of Al0.6CoCrFeNi High-Entropy Alloys by Thermo-Mechanical Processing

Phase Selection, Lattice Distortions, and Mechanical Properties in High‐Entropy Alloys

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