Heterogeneous banded precipitation of (CoCrNi)93Mo7 medium entropy alloys towards strength–ductility synergy utilizing compositional inhomogeneity

Chang, Ruobin; Fang, Wei; Yu, Haoyang; Bai, Xi; Zhang, Xin; Liu, Baoxi; Yin, Fuxing

doi:10.1016/j.scriptamat.2019.07.026

Cited by 86 publications

(12 citation statements)

References 41 publications

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“…Moreover, the SFE of the Mo-doped alloy at 0 K was equivalent to that of the CoCrNi alloy [120] . The σ phase is precipitated after the Mo element becomes supersaturated [121][122][123] .…”

Section: Substitutional Elements (Al Fe Mo W Cu Nb and Ti)mentioning

confidence: 99%

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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The CoCrFeMnNi alloy is one of the most notable first-generation high-entropy alloys and is also known as a Cantor alloy. This alloy was first proposed in 2004 and shows promising performance at cryogenic temperatures (CTs). Subsequent research has indicated that the equiatomic ternary CoCrNi medium-entropy alloy (MEA), as a subset of the Cantor alloy family, has better mechanical properties than the CoCrFeMnNi alloy. Interestingly, both the strength and ductility of the CoCrNi MEA are higher at CTs than at room temperature. CoCrNi-based alloys have attracted considerable attention in the metallic materials community and it is therefore important to generalize and summarize the latest progress in CoCrNi-based MEA research. The present review initially briefly introduces the discovery of the CoCrNi MEA. Subsequently, its tensile response and deformation mechanisms are summarized. In particular, the effects of parameters, such as critical resolved shear stress, stacking fault energy and short-range ordering, on the deformation behavior are discussed in detail. The methods for strengthening the CoCrNi MEA are then reviewed and divided into two categories, namely, modifying microstructures and adjusting chemical compositions. In addition, the mechanical performance of CoCrNi-based MEAs, including their dynamic shear properties, creep behavior and fracture toughness, is also deliberated. Finally, the development prospects of CoCrNi-based MEAs are proposed.

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Section: Substitutional Elements (Al Fe Mo W Cu Nb and Ti)mentioning

confidence: 99%

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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“…Li and Raabe (2018) investigated the effect of compositional inhomogeneity on the properties of dual-phase non-equiatomic Fe 49.5 Mn 30 Co 10 Cr 10 C 0.5 iHEAs prepared via cold-rolling, recrystallization annealing and hot rolling. Results showed that the strain-hardening ability and ductility of the iHEA reduced attributed to the compositional inhomogeneity (Chang et al , 2019; Guo et al , 2019).…”

Section: Advances In Materials Technology: High Entropy Materialsmentioning

confidence: 99%

Recent advances of high entropy alloys for aerospace applications: a review

Dada

Popoola

Mathe

2021

WJE

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Purpose This study aims to review the recent advancements in high entropy alloys (HEAs) called high entropy materials, including high entropy superalloys which are current potential alternatives to nickel superalloys for gas turbine applications. Understandings of the laser surface modification techniques of the HEA are discussed whilst future recommendations and remedies to manufacturing challenges via laser are outlined. Design/methodology/approach Materials used for high-pressure gas turbine engine applications must be able to withstand severe environmentally induced degradation, mechanical, thermal loads and general extreme conditions caused by hot corrosive gases, high-temperature oxidation and stress. Over the years, Nickel-based superalloys with elevated temperature rupture and creep resistance, excellent lifetime expectancy and solution strengthening L12 and γ´ precipitate used for turbine engine applications. However, the superalloy’s density, low creep strength, poor thermal conductivity, difficulty in machining and low fatigue resistance demands the innovation of new advanced materials. Findings HEAs is one of the most frequently investigated advanced materials, attributed to their configurational complexity and properties reported to exceed conventional materials. Thus, owing to their characteristic feature of the high entropy effect, several other materials have emerged to become potential solutions for several functional and structural applications in the aerospace industry. In a previous study, research contributions show that defects are associated with conventional manufacturing processes of HEAs; therefore, this study investigates new advances in the laser-based manufacturing and surface modification techniques of HEA. Research limitations/implications The AlxCoCrCuFeNi HEA system, particularly the Al0.5CoCrCuFeNi HEA has been extensively studied, attributed to its mechanical and physical properties exceeding that of pure metals for aerospace turbine engine applications and the advances in the fabrication and surface modification processes of the alloy was outlined to show the latest developments focusing only on laser-based manufacturing processing due to its many advantages. Originality/value It is evident that high entropy materials are a potential innovative alternative to conventional superalloys for turbine engine applications via laser additive manufacturing.

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“…So far, the strength of MEAs has been improved through adding appropriate elements (i.e., Al, Ti, Si, La, Cr, Mo, etc.). [6][7][8][9][10] These elements can be introduced into HEAs to form more pinning sites for dislocation motions, improving their mechanical properties. [11,12] However, a high addition of these elements can form brittle precipitates inside the matrix, significantly reducing the ductility of MEAs and HEAs.…”

Section: Introductionmentioning

confidence: 99%

Strengthening and Toughening of the Co₃₄Cr₃₂Ni₂₇Al_3.5Ti_3.5 Alloy Through Coherent L1₂ Nanoprecipitates

Li,

Song,

Gao

et al. 2024

Adv Eng Mater

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In this work, the L12‐strengthened Co34Cr32Ni27Al3.5Ti3.5 medium‐entropy alloy (MEA) with outstanding strength and ductility was developed through cold rolling and annealing (CRA). The CRA promotes the formation of coherent L12 nanoprecipitates in the matrix and precipitates inside the grains (Ti‐rich phases), resulting in dislocation sliding and multiplication during deformation. The as‐cast sample exhibits low yield strength (YS) of ∽498.5 MPa, ultimate tensile strength (UTS) of ∽820.5 MPa, and uniform elongation (UE) of ∽29.8%. After cold rolling and annealing, the YS, UTS, and UE are significantly increased to ∽678.4 MPa, ∽1109.3 MPa, and ∽44.5%, respectively. The excellent mechanical performance results from dislocation strengthening and precipitation strengthening of the L12 phase. The trade‐off of strength‐ductility is resolved by achieving an appropriate balance between the hard phase rich in L12/Ti and the soft FCC phase. Our finding demonstrates that the CRA method can be used to create coherent L12 nanoprecipitates that are beneficial for strong and ductile MEA. This work provides a broader perspective for CoCrNi‐based MEAs with high performance in the future.This article is protected by copyright. All rights reserved.

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Heterogeneous banded precipitation of (CoCrNi)93Mo7 medium entropy alloys towards strength–ductility synergy utilizing compositional inhomogeneity

Cited by 86 publications

References 41 publications

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Recent advances of high entropy alloys for aerospace applications: a review

Strengthening and Toughening of the Co₃₄Cr₃₂Ni₂₇Al_3.5Ti_3.5 Alloy Through Coherent L1₂ Nanoprecipitates

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Heterogeneous banded precipitation of (CoCrNi)93Mo7 medium entropy alloys towards strength–ductility synergy utilizing compositional inhomogeneity

Cited by 86 publications

References 41 publications

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Recent advances of high entropy alloys for aerospace applications: a review

Strengthening and Toughening of the Co34Cr32Ni27Al3.5Ti3.5 Alloy Through Coherent L12 Nanoprecipitates

Contact Info

Product

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About

Strengthening and Toughening of the Co₃₄Cr₃₂Ni₂₇Al_3.5Ti_3.5 Alloy Through Coherent L1₂ Nanoprecipitates