A novel high-strength and high-ductility CoCrNi medium entropy alloy by Ti/Mo co-doping

Liu, X.S.; Li, R.; Li, A.X.; Xu, Shan; Yang, He; Yu, Subo; Jiang, Minghui; Huo, Chao; Yu, Pengfei; Wang, Y.Y.; Li, G.

doi:10.1016/j.matlet.2022.132929

Cited by 11 publications

(2 citation statements)

References 18 publications

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“…In spite of this, great efforts have been made by researchers to improve the substitutional strengthening effect of HEAs/MEAs. For example, numerous studies [80][81][82][83][84] have shown that the introduction of large size substitutional atoms (such as Al, W, Ti and Al/Ti/Mo codoping) into HEAs/MEAs is an effective way to improve the strength of the alloys. This is mainly based on the fact that the magnitude of lattice distortion is linked to both the atomic size and modulus misfits between solute and solvent atoms.…”

Section: Solid-solution Strengtheningmentioning

confidence: 99%

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: Solid-solution Strengtheningmentioning

confidence: 99%

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

et al. 2023

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“…In various HEAs, the alloys with a single FCC-structure, such as CoCrFeMnNi [13], CoCrFeNi [14], and CoCrNi [15], performed noticeably in ductile and damage-tolerance [16,17], but were deficient in strength for the structural applications [18,19]. Therefore, several typical strengthening methods, including the solution strengthening [20], dislocations strengthening [21], refinement strengthening [22], and precipitation strengthening [23], were introduced into the FCC-structured HEAs and verified to be available.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of CrFeNi high-entropy alloy reinforced by Al and Ti elements

Zhao,

Ma,

Yang

et al. 2024

Mater. Res. Express

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Developing high entropy alloys (HEAs) that possess both superior mechanical properties and low cost is a classic challenge in the design of alloys used in engineering applications. In this work, a series of Co-free AlxTi(9-x)(CrFeNi)91(x=0, 3, 6, and 9 at%, denoted as AlxTi(9-x) hereafter) HEAs were designed to investigate the influence of Al and Ti elements on the microstructure and mechanical properties of the FCC-structured CrFeNi alloy and pursue a considerable strength-plasticity balance. Massive precipitates with a nano-scale but different morphology and/or structure formed in the inter-dendritic region of alloys. The morphology of precipitates was strongly linked with the variation in the relative content of Al and Ti elements, which varied from a granular shape (ordered BCC structure) in Al9 and Al6Ti3 alloys to a strip shape (HCP structure) in Al3Ti6 alloy. With an increase (decrease) in Ti (Al) content, the yield strength of alloy significantly improved, which benefited from the combined effect of solution strengthening and precipitation strengthening, but the elongation dropped sharply. Compared to the same amount of Al element, Ti element contributed to the improvement of strength but deteriorated the plasticity of alloy. Thereinto, Al6Ti3 alloy presented a relatively favorable strength-plasticity balance with a yield strength of 768 MPa and an elongation of 10.2%. Apparently, only the moderate amount of Al and Ti elements helps to the favorable configuration of strength and plasticity. The findings in this work provide a distinct insight into the design and optimization of Co-free HEAs as the structural applications.

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Laser-directed energy deposition of a high performance additively manufactured (CoCrNi)94(TiAl)6 medium-entropy alloy with a novel core-shell structured strengthening phase

Bi,

Li,

Yuan

et al. 2024

Additive Manufacturing

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A novel high-strength and high-ductility CoCrNi medium entropy alloy by Ti/Mo co-doping

Cited by 11 publications

References 18 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

Microstructure and mechanical properties of CrFeNi high-entropy alloy reinforced by Al and Ti elements

Laser-directed energy deposition of a high performance additively manufactured (CoCrNi)94(TiAl)6 medium-entropy alloy with a novel core-shell structured strengthening phase

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