The effect of discontinuous γ' precipitation on the mechanical properties of Al-Co-Ni alloys

Zhou, Yang; Zhou, Fei; Martins, Joao Marcos Ribeiro; Nash, Philip; Wang, Jun

doi:10.1016/j.matchar.2019.04.003

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…Nevertheless, the properties of a fully transformed DP structure are likely to be superior to those of a CP structure in the same alloy. Recently, the excellent mechanical properties of a DP structure containing coherent c/c 0 lamellae have been demonstrated by Nash and Zhou et al [21,22] (Fig. 2), Fan et al [23] and Banerjee et al [24].…”

Section: Structural Propertiesmentioning

confidence: 89%

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Invited viewpoint: in situ nanostructured lamellar composites

Nash

Zhou

2022

J Mater Sci

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The discontinuous precipitation reaction has been observed in many alloys for more than 50 years. Most of the work on this phase transformation is aimed at suppressing it as it is known to be deleterious for mechanical properties when it is confined to grain boundary regions. However, it has been postulated that if the transformation goes to completion, then significant strengthening can occur analogous to the pearlite transformation in steels. In this article, we argue that this transformation has the potential to offer a new paradigm for both structural and functional applications.

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Section: Structural Propertiesmentioning

confidence: 89%

“…In addition, the potential for coherency between the matrix and precipitate will provide additional strengthening as observed for example in Ni-base superalloys. Indeed such is the case in the Ni-Co-Al system where the DP reaction results in a c/c 0 coherent or semi-coherent lamellar structure [21].…”

Section: Structural Propertiesmentioning

confidence: 96%

Invited viewpoint: in situ nanostructured lamellar composites

Nash

Zhou

2022

J Mater Sci

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“…3) Multiphase composites. Extensive studies have been performed to investigate the influence of second phases, such as metallic phase (20)(21)(22)(23)(24)(25)(26), carbides and oxides (27) on deformability of NiAl.…”

Section: Introductionmentioning

confidence: 99%

High-strength nanocrystalline intermetallics with room temperature deformability enabled by nanometer thick grain boundaries

Neffati

Cho

et al. 2021

Sci. Adv.

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Although intermetallics are attractive for their high strength, many of them are often brittle at room temperature, thereby severely limiting their potential as structural materials. Here, we report on a previously unidentified deformable nanocrystalline CoAl intermetallics with Co-rich thick grain boundaries (GBs). In situ micropillar compression studies show that nanocrystalline CoAl with thick GBs exhibits ultrahigh yield strength, exceeding 4.5 gigapascals. Unexpectedly, nanocrystalline CoAl intermetallics also show prominent work hardening to a flow stress of 5.7 gigapascals up to 20% compressive strain. Transmission electron microscopy studies show that deformation induces abundant dislocations inside CoAl grains with thick GBs, which accommodate plastic deformation. Molecular dynamics simulations reveal that the Co-rich thick GBs play a vital role in promoting nucleation of dislocations at the Co/CoAl interfaces, thereby enhancing the plasticity of the intermetallics. This study provides a perspective to promoting the plasticity of intermetallics via the introduction of thick GBs.

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Effect of Cr and Ni/Fe Ratio on the Microstructure and Mechanical Properties of γ′-Strengthened Ni–Fe-Based Alloys

Liu

Tin

2022

Metall Mater Trans A

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The effect of discontinuous γ' precipitation on the mechanical properties of Al-Co-Ni alloys

Cited by 13 publications

References 24 publications

Invited viewpoint: in situ nanostructured lamellar composites

Invited viewpoint: in situ nanostructured lamellar composites

High-strength nanocrystalline intermetallics with room temperature deformability enabled by nanometer thick grain boundaries

Effect of Cr and Ni/Fe Ratio on the Microstructure and Mechanical Properties of γ′-Strengthened Ni–Fe-Based Alloys

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