Superplasticity of high-entropy alloys: a review

Motallebi, Reza; Savaedi, Zeinab; Mirzadeh, Hamed

doi:10.1007/s43452-021-00344-x

Cited by 30 publications

(11 citation statements)

References 52 publications

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“…Building upon all four main previously mentioned classifications of cold working processes, comprising of drawing, squeezing, bending, and shearing, the superplastic forming is basically implemented at hot working processes, and, there are only rare cases of obtaining superplasticity in nanostructured materials, which have been reported by some studies, namely [60] indicating a superplastic elongation up to 2000% in an Al 9 (CoCrFeMnNi) 91 (at%) nanostructured-high-entropy alloy. In general, superplasticity is observed in materials which have very fine grains less than 10-μm size [60] and at low-scale strain rates, considering the high homologous temperatures bigger than half of the melting temperature that is referred to the hot working regime [47,50].…”

Section: Novelty Of the Studymentioning

confidence: 99%

Mechanical and tribo-metallurgical behavior of 17-4 precipitation hardening stainless steel affected by severe cold plastic deformation: a comprehensive review article

Bazri

Mapelli

Barella

et al. 2022

J Braz. Soc. Mech. Sci. Eng.

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This article comprehensively reviews the mechanical properties and tribo-metallurgical behavior of 17-4 precipitation hardening stainless steel (17-4PH SS) during and after cold plastic deformation. Referring to the scientific literature, stainless steels are one of the few types of ferrous alloys which could be appropriately set up through cold working processes in the forms of sheets or other shapes. Likewise, some other metal alloys such as mild low-carbon-based steels, copper and its alloys, aluminum alloys, and some others are the few types of metal alloys which have this capability. On the other hand, in engineering applications, there are several types of mechanical failures, which must be taken into account to investigate the mechanical behavior and tribo-metallurgical properties of any targeted materials. For example, corrosion resistance, wear resistance, and fatigue failure are investigated according to the microstructural studies, comprising of the grain size, grain boundaries, orientations, dislocations, and so on. Based on the published results, focusing on 17-4PH SS, one of the most main effective factors on mechanical and tribo-metallurgical performance is the grain size. Also, the favorable balance of two mechanical properties of strength and ductility has been reported as a dilemma in the materials science, and the problem delineates upon the limitations of numerous structural materials potentials. Following the failure analysis of the materials, in order to diminish the damages caused by fretting fatigue some methods such as ultrasonic processes are applied for the treatment of 17-4PH SS via changing the microstructure, residual stress, and other parameters. Also, through the other cold deformation technologies, the nanostructured surface layer with highly upgraded mechanical properties of several ultrasonic surface rolling process-treated 17-4PH SS has been obtained. To this end, such cold working processes on 17-4PH SS and their subsequent results are elaborated in this review paper. Graphical abstract

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Section: Novelty Of the Studymentioning

confidence: 99%

Mechanical and tribo-metallurgical behavior of 17-4 precipitation hardening stainless steel affected by severe cold plastic deformation: a comprehensive review article

Bazri

Mapelli

Barella

et al. 2022

J Braz. Soc. Mech. Sci. Eng.

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“…[ 14 , 15 , 16 ] These issues have been recently addressed by developing fine/nanostructured face‐centered cubic (FCC) phase high‐/medium‐entropy alloys (HEAs/ MEAs), with excellent superplasticity, formed via a simple grain‐boundary siding (GBS) mechanism. [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ] However, their strengths are still insufficient for many applications. Obtaining fine/nanocrystalline grains requires additional grain refinement processes, generally complex and high cost, such as high‐pressure torsion, friction stir processing or equal channel angular pressing, etc., [ 3 , 18 , 25 ] which significantly restricts the economic viability of these materials.…”

Section: Introductionmentioning

confidence: 99%

Efficient Coarse‐Grained Superplasticity of a Gigapascal Lightweight Refractory Medium Entropy Alloy

Jia

et al. 2023

Advanced Science

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Superplastic metals that exhibit exceptional ductility (>300%) are appealing for use in high‐quality engineering components with complex shapes. However, the wide application of most superplastic alloys has been constrained due to their poor strength, the relatively long superplastic deformation period, and the complex and high‐cost grain refinement processes. Here these issues are addressed by the coarse‐grained superplasticity of high‐strength lightweight medium entropy alloy (Ti43.3V28Zr14Nb14Mo0.7, at.%) with a microstructure of ultrafine particles embedded in the body‐centered‐cubic matrix. The results demonstrate that the alloy reached a high coarse‐grained superplasticity greater than ≈440% at a high strain rate of 10−2 s−1 at 1173 K and with a gigapascal residual strength. A consecutively triggered deformation mechanism that sequences of dislocation slip, dynamic recrystallization, and grain boundary sliding in such alloy differs from conventional grain‐boundary sliding in fine‐grained materials. The present results open a pathway for highly efficient superplastic forming, broaden superplastic materials to the high‐strength field, and guide the development of new alloys.

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“…[15][16][17] There is considerable interest in the SPD of HEAs for grain refinement, which is also an important prerequisite for preparing superplastic materials. [18] There are several methods to realize SPD technology, such as equal channel angular pressing (ECAP), [19][20][21] high-pressure torsion (HPT), [22] severe cold rolling (SCR), etc. [23] Schuh et al [24] reported that nanocrystalline CoCrFeNiMn HEAs prepared by HPT exhibited good tensile strength at break and hardness values of 1950 MPa and 520 HV, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cold Rolling and Annealing Treatment on Microstructure and Properties of CoFeNiMnV High‐Entropy Alloys

et al. 2022

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Herein, a combination of cold rolling (CR) and annealing treatment is used to investigate the evolution of the microstructure and mechanical properties of CoFeNiMnV high-entropy alloys (HEAs) fabricated by powder plasma arc additive manufacturing (PPA-AM). The deposited CoFeNiMnV HEAs exhibit a face-centered cubic (FCC) structure with a small amount of σ phase precipitation. After 50% CR, the microstructure of CoFeNiMnV HEAs is severely deformed along the rolling direction, and the grain size is obviously refined. Therefore, the hardness and strength of the alloy are significantly improved. The rolled CoFeNiMnV HEAs are annealed at 500, 700 and 900 °C, for 60 min. The results show that annealing at 500 °C has little effect on the microstructure and dislocation density of the alloy, and the alloy still maintains high strength and hardness. With increasing of annealing temperature to 700 and 900 °C, the dislocation density of the CoFeNiMnV HEAs is significantly reduced. Meanwhile the σ phase is gradually dissolved, and the recrystallized grains and annealing twins are significantly coarsened. The analysis suggests that it decreases the strength of the CoFeNiMnV HEAs, but increases the elongation. CoFeNiMnV HEAs annealed at 700 °C for 60 min after CR exhibit an excellent high strength-toughness combination.

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Superplasticity of high-entropy alloys: a review

Cited by 30 publications

References 52 publications

Mechanical and tribo-metallurgical behavior of 17-4 precipitation hardening stainless steel affected by severe cold plastic deformation: a comprehensive review article

Mechanical and tribo-metallurgical behavior of 17-4 precipitation hardening stainless steel affected by severe cold plastic deformation: a comprehensive review article

Efficient Coarse‐Grained Superplasticity of a Gigapascal Lightweight Refractory Medium Entropy Alloy

Effects of Cold Rolling and Annealing Treatment on Microstructure and Properties of CoFeNiMnV High‐Entropy Alloys

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