Microstructure and formation mechanisms of nanotwins in the shear band in a FeCoNiCrMo0.2 high-entropy alloy

Liu, Ruoyu; Wang, Chu; Liu, Bin; Liu, Yong; Liaw, Peter K.; Wang, Bingfeng

doi:10.1016/j.jmrt.2022.08.054

Cited by 15 publications

(2 citation statements)

References 43 publications

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“…FCC single-phase CrCoNi HEA has also disclosed the presence of twins and recrystallized grains inside shear localization zones even at cryogenic temperature, while a transformation from the FCC to HCP phase occurred within the refined grains [142]. Further, FCC single-phase FeCoNiCrMo 0.2 has been reported to reveal a 25 µm wide ASB during hot extrusion, inside of which nano twins and elongated equiaxed grains dominated, with DRX being the softening mechanism instead of phase transformation, which did not take place [143]. Also, FCC Al 0.1 CoCrFeNi HEA has generally shown high resistance against ASB formation due to its increased strain and strain rate hardening and modest thermal softening.…”

Section: High-entropy Alloysmentioning

confidence: 99%

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A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

Karantza,

Manolakos

2023

Metals

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The current review work studies the adiabatic shear banding (ASB) mechanism in metals and alloys, focusing on its microstructural characteristics, dominant evolution mechanisms and final fracture. An ASB reflects a thermomechanical deformation instability developed under high strain and strain rates, finally leading to dynamic fracture. An ASB initially occurs under severe shear localization, followed by a significant rise in temperature due to high strain rate adiabatic conditions. That temperature increase activates thermal softening and mechanical degradation mechanisms, reacting to strain instability and facilitating micro-voiding, which, through its coalescence, results in cracking failure. This work aims to summarize and review the critical characteristics of an ASB’s microstructure and morphology, evolution mechanisms, the propensity of materials against an ASB and fracture mechanisms in order to highlight their stage-by-stage evolution and attribute them a more consecutive behavior rather than an uncontrollable one. In that way, this study focuses on underlining some ASB aspects that remain fuzzy, allowing for further research, such as research on the interaction between thermal and damage softening regarding their contribution to ASB evolution, the conversion of strain energy to internal heat, which proved to be material-dependent instead of constant, and the strain rate sensitivity effect, which also concerns whether the temperature rise reflects a precursor or a result of ASB. Except for conventional metals and alloys like steels (low carbon, stainless, maraging, armox, ultra-high-strength steels, etc.), titanium alloys, aluminum alloys, magnesium alloys, nickel superalloys, uranium alloys, zirconium alloys and pure copper, the ASB propensity of nanocrystalline and ultrafine-grained materials, metallic-laminated composites, bulk metallic glasses and high-entropy alloys is also evaluated. Finally, the need to develop a micro-/macroscopic coupling during the thermomechanical approach to the ASB phenomenon is pointed out, highlighting the interaction between microstructural softening mechanisms and macroscopic mechanical behavior during ASB evolution and fracture.

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Section: High-entropy Alloysmentioning

confidence: 99%

“…nism instead of phase transformation, which did not take place [143]. Also, FCC Al0.1CoCrFeNi HEA has generally shown high resistance against ASB formation due to its increased strain and strain rate hardening and modest thermal softening.…”

Section: High-entropy Alloysmentioning

confidence: 99%

A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

Karantza,

Manolakos

2023

Metals

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Effects of Cryogenic Temperature on Adiabatic Shear Localization in Equiatomic NiCrFe Medium-Entropy Alloy

Liu,

Yu,

et al. 2024

J. of Materi Eng and Perform

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Mechanical Properties and Microstructure of the Shear Band Formed at Cryogenic Temperature in the NiCrFe Medium-Entropy Alloy

Liu,

Li,

et al. 2024

Acta Metall. Sin. (Engl. Lett.)

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Microstructure and formation mechanisms of nanotwins in the shear band in a FeCoNiCrMo0.2 high-entropy alloy

Cited by 15 publications

References 43 publications

A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

Effects of Cryogenic Temperature on Adiabatic Shear Localization in Equiatomic NiCrFe Medium-Entropy Alloy

Mechanical Properties and Microstructure of the Shear Band Formed at Cryogenic Temperature in the NiCrFe Medium-Entropy Alloy

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