Synergetic strengthening from grain refinement and nano-scale precipitates in non-equiatomic CoCrFeNiMo medium-entropy alloy

Kwon, Hyuk-Sung; Asghari‐Rad, Peyman; Park, Jeong Min; Sathiyamoorthi, Praveen; Bae, Jae Wung; Moon, Jongun; Zargaran, Alireza; Choi, Yeon Taek; Son, Sujung; Kim, Hyoung Seop

doi:10.1016/j.intermet.2021.107212

Cited by 29 publications

(12 citation statements)

References 37 publications

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“…The other strengthening mechanisms in the HEAs including GB strengthening, precipitation strengthening, and dislocation strengthening are similar to those in the conventional metals and alloys, and thus classical models can be used to evaluate reasonably the strength gains in HEAs/MEAs. More importantly, these traditional strengthening strategies based on the simple introduction of dislocation barriers inevitably limit the proliferation and accumulation of dislocations, which would lead to a decline in the ductility, [36,50,86,114,145,148,149,155,159,[181][182][183][184][185][186][187][188][189][190][191][192][193][194][195] as shown in Figure 8. Therefore, in the exploration of simultaneous enhancement of strength and ductility in FCC HEAs/MEAs, the efforts of materials scientists have never stopped.…”

Section: Dislocation Strengtheningmentioning

confidence: 99%

“…Following this idea, several strategies have been proposed with some success, some of which are discussed below. [36,50,86,114,145,148,149,156,159,[181][182][183][184][185][186][187][188][189][190][191][192][193][194][195] Here, Δε and Δσ represent the increase in uniform elongation and ultimate tensile strength caused by strengthening, respectively.…”

Section: Novel Strategies For Achieving Strength-ductility Synergymentioning

confidence: 99%

“…Figure 8. Strength-ductility trade-off caused by traditional strengthening strategies for FCC HEAs/MEAs, grouped by strengthening mechanisms [36,50,86,114,145,148,149,156,159,[181][182][183][184][185][186][187][188][189][190][191][192][193][194][195]. Here, Δε and Δσ represent the increase in uniform elongation and ultimate tensile strength caused by strengthening, respectively.…”

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confidence: 99%

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Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

et al. 2023

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High‐ and medium‐entropy alloys (HEAs/MEAs), also called as multicomponent alloys, are a new class of materials that break through the traditional alloy design concept based on single principal element. However, they do not break away from the magic spell of strength–ductility trade‐off. Therefore, designing HEAs/MEAs with both high strength and high ductility still remains a great challenge nowadays. This article provides a review on the recent progress in mechanical properties of face‐centered cubic (FCC) HEAs/MEAs. First, several traditional strengthening strategies are briefly reviewed, focusing on the strengthening mechanisms and the optimized mechanical properties. Subsequently, various novel strategies for achieving strength–ductility synergy in HEAs/MEAs are summarized, which include lowering the stacking fault energy, regulating the short‐range order, promoting transformation‐induced plasticity, and constructing heterogeneous microstructures. The basic ideas and related underlying mechanisms from these strategies are discussed. Finally, the current challenges and the future outlooks are emphasized and addressed systematically. In brief, the present review is expected to provide a useful guide for the design of HEAs/MEAs with superior mechanical properties.

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Section: Dislocation Strengtheningmentioning

confidence: 99%

Section: Novel Strategies For Achieving Strength-ductility Synergymentioning

confidence: 99%

mentioning

confidence: 99%

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Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

et al. 2023

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“…Therefore, it is required to manipulate the intermetallic compounds to reconcile the strength and ductility of HEAs. It has been shown that the brittle but hard intermetallic compound μ phase can be effectively used as a strengthening unit in CrFeCoNiMo HEAs while relieving its harmful effect on ductility by manipulating its dimension and distribution via tailoring Mo contents [62,[67][68][69]. Moreover, by further coupling solid solution hardening and nanotwinning induced hardening, a superb yield strength-tensile strength-ductility combination is realized [62].…”

Section: Brittle Intermetallic Compoundsmentioning

confidence: 99%

Microstructures and Deformation Mechanisms of FCC-Phase High-Entropy Alloys

Ming¹,

Zheng²,

Wang³

2023

High Entropy Materials - Microstructures and Properties

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Strength and ductility are the most fundamental mechanical properties of structural materials. Most metallurgical mechanisms for enhancing strength often sacrifice ductility, referred to as the strength–ductility trade-off. Over the past few decades, a new family of alloys—high-entropy alloys (HEAs) with multi-principal elements, has appeared great potential to overcome the strength–ductility trade-off. Among various HEAs systems, CrFeCoNi-based HEAs with a face-centered cubic (fcc) structure exhibit a great combination of strength, ductility, and toughness via tailoring microstructures. This chapter summarizes recent works on realizing strength–ductility combinations of fcc CrFeCoNi-based HEAs by incorporating multiple strengthening mechanisms, including solid solution strengthening, dislocation strengthening, grain boundary strengthening, and precipitation strengthening, through compositional and microstructural engineering. The abundant plastic deformation mechanisms of fcc HEAs, including slips associated with Shockley partial dislocation and full dislocations, nanotwinning, martensitic phase transformation, deformation-induced amorphization, and dynamically reversible shear transformation, are reviewed. The design strategies of advanced HEAs are also discussed in this chapter, which provides a helpful guideline to explore the enormous number of HEA compositions and their microstructures to realize exceptional strength–ductility combinations.

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“…Simultaneous utilization of both grain refinement and precipitation strengthening can contribute to an increase in strength at room temperature. [19][20][21] Alloying elements and appropriate thermomechanical process conditions are the decisive factors in exploiting these strengthening sources. Al is well known as a strong second phase former in the face-centered cubic (FCC)-based HEAs and MEAs.…”

Section: Introductionmentioning

confidence: 99%

Synergic Combination of Strength and Ductility through Both Grain Refinement and Precipitation in Al_0.3CoCrNi Medium‐Entropy Alloy

et al. 2023

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To improve the tensile properties of Al0.3CoCrNi (at%), herein, medium‐entropy alloys at room temperature, high‐pressure torsion (HPT), and appropriate annealing are presented. Severe deformation due to HPT causes fine grains and evenly distributed B2 and σ precipitates with a nanometer scale through an annealing procedure. A synergic combination of yield strength over 1.0 GPa and uniform elongation over 25% is obtained due to the simultaneous utilization of both grain refinement and precipitation strengthening.

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Synergetic strengthening from grain refinement and nano-scale precipitates in non-equiatomic CoCrFeNiMo medium-entropy alloy

Cited by 29 publications

References 37 publications

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

Microstructures and Deformation Mechanisms of FCC-Phase High-Entropy Alloys

Synergic Combination of Strength and Ductility through Both Grain Refinement and Precipitation in Al_0.3CoCrNi Medium‐Entropy Alloy

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Synergetic strengthening from grain refinement and nano-scale precipitates in non-equiatomic CoCrFeNiMo medium-entropy alloy

Cited by 29 publications

References 37 publications

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

Microstructures and Deformation Mechanisms of FCC-Phase High-Entropy Alloys

Synergic Combination of Strength and Ductility through Both Grain Refinement and Precipitation in Al0.3CoCrNi Medium‐Entropy Alloy

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Synergic Combination of Strength and Ductility through Both Grain Refinement and Precipitation in Al_0.3CoCrNi Medium‐Entropy Alloy