Achieving superb strength in single-phase FCC alloys via maximizing volume misfit

Zhongtao Li; Shihua Ma; Shijun Zhao; Weidong Zhang; Fei Peng; Qian Li; Tao Yang; Chia-Yi Wu; Daixiu Wei; Yi-Chia Chou; Peter K. Liaw; Yanfei Gao; Zhenggang Wu

doi:10.1016/j.mattod.2023.02.012

Achieving superb strength in single-phase FCC alloys via maximizing volume misfit

Zhongtao Li, Shihua Ma, Shijun Zhao^*, Weidong Zhang, Fei Peng, Qian Li, Tao Yang^*, Chia-Yi Wu, Daixiu Wei^*, Yi-Chia Chou, Peter K. Liaw, Yanfei Gao^*, Zhenggang Wu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

94 Citations (Scopus)

Abstract

Single-phase face-centered cubic (SP-FCC) alloys normally possess low strength. Conventionally strengthening strategies inevitably cause significant ductility sacrifice. Here, a single-phase Ni-based FCC alloy with a superb yield strength of ∼1.05GPa and a good ductility of 37% is designed through maximizing the volume misfits. The misfit of the purposely targeted Ni₈₀Mo₂₀alloy is severer than all existing FCC alloys, bringing the alloy a highest-ever Hall-Petch coefficient (k_HP = 1034 MPa·μm^1/2) and a pronounced solid solution strengthening (Δσ_ss = 224 MPa). Current work yields two surprising and novel findings for SP-FCC alloys. First, volume misfit is a good pertinent indicator of k_HP. Second, the conventional impression about the sole contribution of edge dislocations to strengthening in SP-FCC alloys may no longer hold; instead, screw dislocations can also kick in once the nonsphericity of the solute-induced stress field reaches a critical value. Altogether, this work paves a new avenue of pursuing ultimate strengthening without significant ductility sacrifice for SP-FCC alloys relying on the volume-misfit-maximization strategy.

© 2023 Elsevier Ltd.

Original language	English
Pages (from-to)	108-119
Number of pages	12
Journal	Materials Today
Volume	63
Online published	3 Mar 2023
DOIs	https://doi.org/10.1016/j.mattod.2023.02.012
Publication status	Published - Mar 2023

Funding

The present work was supported financially by the National Key R&D Program of China (No. 2022YFE0200900). SZ acknowledges the support from Research Grants Council of Hong Kong (No. 11200421). TY greatly acknowledges the financial supports from the National Natural Science Foundation of China (No. 52101151). We also appreciate Dr. J.H. Luan for the support on the 3D-APT test. PKL very much appreciates the supports from (1) the National Science Foundation (DMR-1611180 and 1809640) and (2) the US Army Research Office (W911NF-13–1-0438 and W911NF-19–2-0049).

Research Keywords

Single-phase face-centered cubic alloys
Volume misfit
Solid-solution strengthening
Grain-boundary strengthening
Mechanical properties

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title = "Achieving superb strength in single-phase FCC alloys via maximizing volume misfit",

abstract = "Single-phase face-centered cubic (SP-FCC) alloys normally possess low strength. Conventionally strengthening strategies inevitably cause significant ductility sacrifice. Here, a single-phase Ni-based FCC alloy with a superb yield strength of ∼1.05GPa and a good ductility of 37% is designed through maximizing the volume misfits. The misfit of the purposely targeted Ni80Mo20 alloy is severer than all existing FCC alloys, bringing the alloy a highest-ever Hall-Petch coefficient (kHP = 1034 MPa·μm1/2) and a pronounced solid solution strengthening (Δσss = 224 MPa). Current work yields two surprising and novel findings for SP-FCC alloys. First, volume misfit is a good pertinent indicator of kHP. Second, the conventional impression about the sole contribution of edge dislocations to strengthening in SP-FCC alloys may no longer hold; instead, screw dislocations can also kick in once the nonsphericity of the solute-induced stress field reaches a critical value. Altogether, this work paves a new avenue of pursuing ultimate strengthening without significant ductility sacrifice for SP-FCC alloys relying on the volume-misfit-maximization strategy.{\textcopyright} 2023 Elsevier Ltd.",

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author = "Zhongtao Li and Shihua Ma and Shijun Zhao and Weidong Zhang and Fei Peng and Qian Li and Tao Yang and Chia-Yi Wu and Daixiu Wei and Yi-Chia Chou and Liaw, {Peter K.} and Yanfei Gao and Zhenggang Wu",

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AU - Li, Zhongtao

AU - Ma, Shihua

AU - Zhao, Shijun

AU - Zhang, Weidong

AU - Peng, Fei

AU - Li, Qian

AU - Yang, Tao

AU - Wu, Chia-Yi

AU - Wei, Daixiu

AU - Chou, Yi-Chia

AU - Liaw, Peter K.

AU - Gao, Yanfei

AU - Wu, Zhenggang

PY - 2023/3

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N2 - Single-phase face-centered cubic (SP-FCC) alloys normally possess low strength. Conventionally strengthening strategies inevitably cause significant ductility sacrifice. Here, a single-phase Ni-based FCC alloy with a superb yield strength of ∼1.05GPa and a good ductility of 37% is designed through maximizing the volume misfits. The misfit of the purposely targeted Ni80Mo20 alloy is severer than all existing FCC alloys, bringing the alloy a highest-ever Hall-Petch coefficient (kHP = 1034 MPa·μm1/2) and a pronounced solid solution strengthening (Δσss = 224 MPa). Current work yields two surprising and novel findings for SP-FCC alloys. First, volume misfit is a good pertinent indicator of kHP. Second, the conventional impression about the sole contribution of edge dislocations to strengthening in SP-FCC alloys may no longer hold; instead, screw dislocations can also kick in once the nonsphericity of the solute-induced stress field reaches a critical value. Altogether, this work paves a new avenue of pursuing ultimate strengthening without significant ductility sacrifice for SP-FCC alloys relying on the volume-misfit-maximization strategy.© 2023 Elsevier Ltd.

AB - Single-phase face-centered cubic (SP-FCC) alloys normally possess low strength. Conventionally strengthening strategies inevitably cause significant ductility sacrifice. Here, a single-phase Ni-based FCC alloy with a superb yield strength of ∼1.05GPa and a good ductility of 37% is designed through maximizing the volume misfits. The misfit of the purposely targeted Ni80Mo20 alloy is severer than all existing FCC alloys, bringing the alloy a highest-ever Hall-Petch coefficient (kHP = 1034 MPa·μm1/2) and a pronounced solid solution strengthening (Δσss = 224 MPa). Current work yields two surprising and novel findings for SP-FCC alloys. First, volume misfit is a good pertinent indicator of kHP. Second, the conventional impression about the sole contribution of edge dislocations to strengthening in SP-FCC alloys may no longer hold; instead, screw dislocations can also kick in once the nonsphericity of the solute-induced stress field reaches a critical value. Altogether, this work paves a new avenue of pursuing ultimate strengthening without significant ductility sacrifice for SP-FCC alloys relying on the volume-misfit-maximization strategy.© 2023 Elsevier Ltd.

KW - Single-phase face-centered cubic alloys

KW - Volume misfit

KW - Solid-solution strengthening

KW - Grain-boundary strengthening

KW - Mechanical properties

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SP - 108

EP - 119

JO - Materials Today

JF - Materials Today

ER -

Achieving superb strength in single-phase FCC alloys via maximizing volume misfit

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GRF: Irradiation Damage Mechanism of Multicomponent Transition Metal Carbides

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Achieving superb strength in single-phase FCC alloys via maximizing volume misfit

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Funding

Research Keywords

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GRF: Irradiation Damage Mechanism of Multicomponent Transition Metal Carbides

Cite this