Transformative high entropy alloy conquers the strength-ductility paradigm by massive interface strengthening

Nene, S.S.; Agrawal, P.; Frank, M.; Watts, Andrew; Shukla, Shivakant; Morphew, C.; Chesetti, Advika; Park, Jun-Sang; Mishra, Rajiv S.

doi:10.1016/j.scriptamat.2021.114070

Cited by 16 publications

(3 citation statements)

References 35 publications

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“…Irrespective of the strain level, formation of ε (hcp)‐phase appeared in the microstructure, which is direct evidence of the TRIP effect in M‐HEA. [ 25 ] The low volume fraction of ε (h.c.p.) in the deformed specimens, Figure 3d 1 ,d 2 , is justifiable because most of the Si (which is a critical element for metastability Figure 1b) is associated with the β phase (Figure 2d 1 ), which makes the γ‐phase moderately metastable, and hence it did not show pronounced deformation‐induced transformation, leading to low volume fraction of ε (h.c.p).…”

Section: Resultsmentioning

confidence: 99%

Room‐Temperature Superformability in Novel As‐Cast High‐Entropy Alloy During Compressive Loading

et al. 2022

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Conventional alloys show low compressive strength and strain accommodation due to their propensity for limited strengthening mechanisms and rapid compressive instability. High‐entropy alloys (HEA) may overcome this limitation by metastability engineering. Inspired by this, herein, a dual‐phase Fe44Mn20Cr15Ni7.5Co6Si7.5 HEA (M‐HEA) which shows maximum engineering strength of ≈4.4 GPa at true compressive strain of ≈2.2 (engineering strain of 90%) in as‐cast condition due to controlled hardening and sustained softening response during deformation is presented. The controlled hardening phenomenon (up to 60% strain) is attributed to transformation‐induced plasticity in γ‐phase and nanotwinning in untransformed γ‐phase. The sustained softening is a result of extensive strain accommodation by both γ‐ and β‐phases via dynamic recovery in γ‐phase and shearing of β‐phase during deformation. Hence, this superformability in M‐HEA makes it an excellent material for structural applications in comparison with other conventional alloys and HEAs.

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Section: Resultsmentioning

confidence: 99%

Room‐Temperature Superformability in Novel As‐Cast High‐Entropy Alloy During Compressive Loading

et al. 2022

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“…Similarly, the phase separation of FCC from the BCC matrix occurred after the addition of Cu into AlCoCrFeNi, which induced a balance in the mechanical properties [18]. Nene et al demonstrated the ability of Cu-containing HEA (Fe 38.5 Mn 20 Co 20 Cr 15 Si 5 Cu 1.5 ) to balance the strength and ductility synergy at room temperature owing to the formation of twin and plate type interfaces [19]. Similarly, Xian et al demonstrated the potential of Cu to simultaneously enhance the strength and ductility of CrMnFeCoNiCu x HEA [20].…”

Section: Introductionmentioning

confidence: 99%

Correlation between the nanomechanical characteristic and the phase transformation of BCC-based high entropy alloys produced via powder metallurgy

et al. 2023

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In this study, the effects of Cu addition on AlFeMnTiSi 0.75 Cu x (x = 0, 0.25, 0.5, 0.75, 1.00; in molar ratios) high entropy alloys (HEAs) prepared via mechanical alloying and spark plasma sintering were investigated. The structure, phase, morphology and composition of HEA powders were analysed and the results revealed that the AlFeMnTiSi 0.75 Cu x HEAs exhibited a multiphase structure. Additionally, after sintering at 900 °C, the formation of BCC, µ and L2 1 phases in the densified HEAs was enhanced. The investigation of the hardness, nanoindentation and compressive properties revealed that the microstructural and mechanical properties of AlFeMnTiSi 0.75 Cu x HEAs were improved at the optimal Cu fraction (0.25 molar ratio). The nanoindentation results revealed that the AlFeMnTiSi 0.75 Cu x HEAs exhibited the highest hardness and elastic modulus (H IT = 19.2 GPa, E IT = 336 GPa). These results improve the current understanding of multiphase HEAs and may pave way for the development of advanced HEAs with superior mechanical properties.

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“…High-entropy alloys (HEAs) are solid-solution alloys comprising five or more principal constituent elements [1,2]. HEAs are materials which exhibit attractive properties in terms of high temperature strength [3], ductility [4], fatigue resistance [5],…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of effective atomic radii of constituent elements in CrMnFeCoNi high-entropy alloy

Teramoto

Narasaki

Tanaka

2022

Philosophical Magazine Letters

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To elucidate the complex mechanism of solid-solution strengthening in high entropy alloys (HEAs), it is necessary to determine the effective atomic radii of the constituent elements that are the sources of lattice strain. In the present study, the effective atomic radii of the constituent elements in CrMnFeCoNi HEA which is the basis of the atomic displacement are evaluated from the lattice parameters experimentally determined via θ-2θ X-ray diffraction measurements. The order of the evaluated atomic radii in the present study is different from that of the atomic radii determined via ab-initio calculations in previous studies. The results of the ab-initio calculations indicate a correlation between the yield stress of and the average atomic displacement in the HEA. However, no definite correlation is confirmed by the experimental results in the present study.

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Transformative high entropy alloy conquers the strength-ductility paradigm by massive interface strengthening

Cited by 16 publications

References 35 publications

Room‐Temperature Superformability in Novel As‐Cast High‐Entropy Alloy During Compressive Loading

Room‐Temperature Superformability in Novel As‐Cast High‐Entropy Alloy During Compressive Loading

Correlation between the nanomechanical characteristic and the phase transformation of BCC-based high entropy alloys produced via powder metallurgy

Experimental determination of effective atomic radii of constituent elements in CrMnFeCoNi high-entropy alloy

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