A dual-phase alloy with ultrahigh strength-ductility synergy over a wide temperature range

Nutor, Raymond Kwesi; Cao, Q.P.; Wei, Ran; Su, Qingmei; Du, Gaohui; Wang, Xiaodong; Li, Fushan; Zhang, Dongxian; Jiang, Jianzhong

doi:10.1126/sciadv.abi4404

Cited by 84 publications

(18 citation statements)

References 51 publications

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“…Nutor et al discovered a CoNiV-based HEA strengthened by B2 nanoprecipitates through the addition of Al. 160 This alloy exhibited excellent tensile yield strength and ductility, particularly in cryogenic temperatures. The presence of twins and stacking faults near the nanoprecipitates accommodated the high interfacial stress between the FCC and B2 phases, effectively suppressing crack nucleation and prolonging strain hardening.…”

Section: Bulk Nanostructured Heasmentioning

confidence: 97%

Nanostructured High Entropy Alloys as Structural and Functional Materials

Zhu,

Gao,

Yao

et al. 2024

ACS Nano

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Since their introduction in 2004, high entropy alloys (HEAs) have attracted significant attention due to their exceptional mechanical and functional properties. Advances in our understanding of atomic-scale ordering and phase formation in HEAs have facilitated the development of fabrication techniques for synthesizing nanostructured HEAs. These materials hold immense potential for applications in various fields including automobile industries, aerospace engineering, microelectronics, and clean energy, where they serve as either structural or functional materials. In this comprehensive Review, we conduct an in-depth analysis of the mechanical and functional properties of nanostructured HEAs, with a particular emphasis on the roles of different nanostructures in modulating these properties. To begin, we explore the intrinsic and extrinsic factors that influence the formation and stability of nanostructures in HEAs. Subsequently, we delve into an examination of the mechanical and electrocatalytic properties exhibited by bulk or three-dimensional (3D) nanostructured HEAs, as well as nanosized HEAs in the form of zero-dimensional (0D) nanoparticles, one-dimensional (1D) nanowires, or two-dimensional (2D) nanosheets. Finally, we present an outlook on the current research landscape, highlighting the challenges and opportunities associated with nanostructure design and the understanding of structure−property relationships in nanostructured HEAs.

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Section: Bulk Nanostructured Heasmentioning

confidence: 97%

Nanostructured High Entropy Alloys as Structural and Functional Materials

Zhu,

Gao,

Yao

et al. 2024

ACS Nano

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“…In several fcc-structured HEAs, Al alloying has been a commonly exploited strategy to improve the room temperature yield strength and hardness [ 13 , 14 , 15 , 16 , 17 , 18 ]. Without exceeding the solid-solution limit of the fcc phase, the Al addition induces a solid-solution strengthening effect due to an elastic misfit caused by an enhanced lattice distortion [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Plasticity Improvement in a Co-Rich Co40Fe25Cr20Ni15 High-Entropy Alloy via Al Alloying

Chen

Nutor

et al. 2023

Materials

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The mechanical properties of high-entropy alloys (HEAs) can be regulated by altering the stacking fault energy (SFE) through compositional modulation. The Co-rich HEAs, exhibiting deformation twinning and even strain-induced martensitic transformation at room temperature, suffer from insufficient ductility at high strength. In this work, we developed Co-rich (Co40Fe25Cr20Ni15)100−xAlx (x = 0 and 5 at.%) HEAs and investigated their tensile behaviors at room temperature. The addition of Al resulted in a massive improvement in the strength-ductility product, even at similar grain sizes, and also altered the fracture mode from quasi-cleavage to ductile dimple fracture. Interestingly, both alloys were deformed by mechanical twinning, which was also verified by molecular dynamics (MD) simulations. The MD simulations revealed the SFE increased upon Al addition; however, the slip energy barrier was reduced, which favored the mobility of dislocations and twinning propensity to prolong strain hardening. The present findings provide further insights into the regulation of mechanical properties of HEAs by Al-alloying.

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“…Research on nanoparticle or cluster structures has confirmed the advantages of small catalysts ( 21 ). It is reasonable to expect that, given the above advantages of high-/medium-entropy alloys and amorphous alloys in the preparation of a new class of crystal (high-/medium-entropy)–glass nano-dual-phase alloys, the synergistic effects from the two phases may contribute to excellent HER performance as dual-phase material performs in mechanical property ( 22 ). Therefore, integrating the crystal-glass dual-phase ( 23 ) structure and size effect is an optimal approach to the fabrication of new-generation catalysts.…”

Section: Introductionmentioning

confidence: 99%

A crystal glass–nanostructured Al-based electrocatalyst for hydrogen evolution reaction

Liu

Zhong

et al. 2022

Sci. Adv.

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Platinum-based catalysts are widely used in hydrogen evolution reactions; however, their applications are restricted because of the cost-efficiency trade-off. Here, we present a thermodynamics-based design strategy for synthesizing an Al 73 Mn 7 Ru 20 (atomic %) metal catalyst via combinatorial magnetron co-sputtering. The new electrocatalyst is composed of ~2 nanometers of medium-entropy nanocrystals surrounded by ~2 nanometers of amorphous regions. The catalyst exhibits exceptional performance, similar to that of single-atom catalysts and better than that of nanocluster-based catalysts. We use aluminum rather than a noble metal as the principal element of the catalyst and ruthenium, which is cheaper than platinum, as the noble metal component. The design strategy provides an efficient route for the development of electrocatalysts for use in large-scale hydrogen production. Moreover, the superior hydrogen reaction evolution created by the synergistic effect of the nano-dual-phase structure is expected to guide the development of high-performance catalysts in other alloy systems.

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A dual-phase alloy with ultrahigh strength-ductility synergy over a wide temperature range

Cited by 84 publications

References 51 publications

Nanostructured High Entropy Alloys as Structural and Functional Materials

Nanostructured High Entropy Alloys as Structural and Functional Materials

Plasticity Improvement in a Co-Rich Co40Fe25Cr20Ni15 High-Entropy Alloy via Al Alloying

A crystal glass–nanostructured Al-based electrocatalyst for hydrogen evolution reaction

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