Tailoring heterogeneities in high-entropy alloys to promote strength–ductility synergy

Ma, Evan; Wu, Xiaolei

doi:10.1038/s41467-019-13311-1

Cited by 384 publications

(94 citation statements)

References 96 publications

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“…There have been several important HEA studies reporting breakthroughs in strength-ductility synergy at cryogenic and room temperatures 7 , 20 – 22 , 40 ; however, none of them have addressed the high temperature mechanical properties of these HEAs. Therefore, this article uniquely addresses the issue of high temperature tensile strength of HEAs, especially the HESA in the HT-2 condition has performed exceptionally well comparing reported HEAs and advanced superalloys, Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In conventional precipitation strengthened superalloys, precipitation of coherent Ni 3 (Al, Ti) L1 2 structured phase in FCC matrix can provide effective strengthening 19 . Recent studies have shown that coherent L1 2 phase could also be an effective strengthener in HEAs 11 , 20 – 22 , for example, L1 2 precipitation in Al 7 (Fe, Co, Ni) 86 Ti 7 resulted a combination of high tensile yield strength (1,028 MPa) with large elongation (47.8%) at room temperature 20 . However, the elevated temperature tensile strength of HEA could be limited by insufficient fractions and relatively low solvus of strengthening phases in HEAs 11 .…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical microstructure strengthening in a single crystal high entropy superalloy

Chen

Chang

Murakami

et al. 2020

Sci Rep

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By contrast, the APT reconstructions in Fig. 2b shows an interesting hierarchical microstructure, in addition to the FCC matrix and the L1 2 phases, there were nano-particles dispersion within the L1 2 phase. These nanoparticles were only present in the HT-2 state, not in the previous HT-1 state. Compositions of each phase in HT-2 state are summarized in Table 1. The calculated partitioning coefficients of Al,

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hierarchical microstructure strengthening in a single crystal high entropy superalloy

Chen

Chang

Murakami

et al. 2020

Sci Rep

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“…In advanced high strength steels for structural applications, to pursue the superior (σ y , ε u ) combination causes long concern [1][2][3][4][5][6][7][8], where σ y is the yield strength and ε u is the tensile uniform strain. So far, the real challenge lies in low ε u particularly at high and even ultrahigh σ y [1][2][3], typical of the (σ y , ε u ) trade-off.…”

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confidence: 99%

“…So far, the real challenge lies in low ε u particularly at high and even ultrahigh σ y [1][2][3], typical of the (σ y , ε u ) trade-off. The crux of the problem is inadequate strain hardening, which can no longer keep up with high flow stress to circumvent plastic instability [6][7][8], i.e. necking via strain localization, as predicted by the Considerè criterion.…”

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confidence: 99%

“…On one hand, high σ y is usually obtained by either cold work or plastic deformation-induced grain refinement. However, such strengthening comes at the expense of strain hardening [6][7][8], because intra-granular dislocation plasticity, a potent mechanism for strain hardening, almost disappears. On the other hand, several other strategies for strain hardening take effect mainly at low σ y in coarse-grained structures, including the transformation-induced plasticity (TRIP) effect [1,5,9], twinning-induced plasticity effect [10,11], second phase [4], and nano-precipitates [3] etc.…”

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Superior strength-ductility synergy by hetero-structuring high manganese steel

Fang

Xue

Kobayashi

et al. 2020

Materials Research Letters

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Lacking of forest hardening makes low ductility in steels long challenge particularly at high yield strength. Here, we report to make good use of hetero-structuring for superior strength-ductility synergy in high manganese steel. The point is to retain original deformed structure of large quantity, along with recrystallized ultrafine-grains and fine grains, jointly for most effective heterogeneous deformation-induced (HDI) hardening especially at high strength. The residual plastic strain of larger than 0.2% and large proportion of HDI stress over 60% indicate the crucial role in ductility by HDI hardening. This renders a significantly upgraded strength-ductility combination within high strength scope. IMPACT STATEMENT By using the hetero-structuring strategy, a superior strength-ductility synergy is realized specifically at ultra-high strength in high manganese steel.

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Effect of Microstructure on Wear and Corrosion Performance of Thermally Sprayed AlCoCrFeMo High‐Entropy Alloy Coatings

2022

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mixed in equimolar or close to equimolar concentrations, enabling them to form a single-phase solid solution. [4] However, the formation of intermetallics together with solid solution phases was also reported for the HEAs. [5,6] The alloys exhibit an inherently high configurational entropy effect owing to compositionally complex mixing, which promotes the solid solution phases in the form of face-centered cubic (FCC) and/or body-centered cubic (BCC) phases. [6] Other core effects, such as sluggish diffusion, distorted lattice, and cocktail effect, favor HEAs to have outstanding properties, including excellent strength, [7] significant toughness, [8] and better strain hardening ability [9] with remarkable tribological characteristics, including superior wear and corrosion resistance. [6,[9][10][11] Various studies had been employed to produce HEAs by arc melting, [12,13] spark plasma sintering, [14] laser technology, [15] microwave processing, [5,16] additive manufacturing, [17,18] and thermal spraying. [19,20] Among the techniques, thermal spray manufacturing is a promising and well-established technology, which is capable of using a broad range of feedstocks (including alloys, ceramics, and polymers) for producing thick coatings for use in developing protective surface layers. [21] The impact of thermal spraying of HEA coatings on microstructure, mechanical, and wear properties has been studied previously. [22,23] For instance, Wang et al. [24] reported excellent hardness for the AlCoCrFeNi HEA coatings developed via atmospheric plasma spraying due to hard BCC and ordered B2 phases. Another study by Meghwal et al. [22] reported high hardness of around 4 GPa for AlCoCrFeNi due to the formation of Al-rich oxide phases. Still a noticeable decrease in the corrosion performance was found compared to 316L stainless steel under seawater conditions. However, the high-temperature heat source in thermal spraying can result in undesirable phase transformations, residual stresses, and oxide contaminations. [23] In addition, the oxide inclusions along with voids such as pores and cracks are detrimental for protective performance against electrochemical damage. To probe such microstructural inhomogeneities, deposition techniques that operate with low-temperature heat sources are desirable.Cold spraying is a branch of thermal spray technologies that received attention for structural repair coatings for various

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Tailoring heterogeneities in high-entropy alloys to promote strength–ductility synergy

Cited by 384 publications

References 96 publications

Hierarchical microstructure strengthening in a single crystal high entropy superalloy

Hierarchical microstructure strengthening in a single crystal high entropy superalloy

Superior strength-ductility synergy by hetero-structuring high manganese steel

Effect of Microstructure on Wear and Corrosion Performance of Thermally Sprayed AlCoCrFeMo High‐Entropy Alloy Coatings

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