A general physics-based hardening law for single phase metals

A simple exponential strain hardening model (ESH) has been developed in the framework of the Kocks-Mecking-Estrin formalism with a new microstructure-based parameter that accounts for the effect of yield strength. The relevant parameters reflecting the effect of the composition (or dislocation annihilation distance) and the microstructure type (or strengthening technology) are comprehensively analyzed. The application scope of the model is then briefly discussed, and several significant advantages are enumerated including the clear derivation processes and the explicit physical meaning of the various parameters. Finally, the ESH model is verified extensively by systematic tensile tests on six groups of Cu-Al alloys having more than one hundred microstructural states. In addition, significant and quantitative revelations of strength and uniform elongation for ductile metals are elaborated in the following manuscript. The present ESH model is of significant theoretical value in providing a detailed understanding of the tensile performance of metallic materials.

Dislocation annihilation, Strain hardening, Strength, Tensile testing, Uniform elongation

10.1016/j.actamat.2022.117877

1359-6454

Zhang, Zhenjun

1d4dfd5e-314d-46c2-91d2-4a260f3b552f

Qu, Zhan

a8ce0bc7-fc4e-47ef-b09c-e567c02541af

Xu, Ling

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Liu, Rui

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Zhang, Peng

3ac04b7d-9a7a-41c6-8c9b-85e73c034969

Zhang, Zhefeng

fae2e491-f76b-4129-bf0e-643161366478

Langdon, Terence G

86e69b4f-e16d-4830-bf8a-5a9c11f0de86

1 June 2022

Zhang, Zhenjun

1d4dfd5e-314d-46c2-91d2-4a260f3b552f

Qu, Zhan

a8ce0bc7-fc4e-47ef-b09c-e567c02541af

Xu, Ling

738ab1b3-707b-468d-85bd-b64bcddf2ee7

Liu, Rui

f6ba8ec9-4057-4dd9-a960-d63f660eee09

Zhang, Peng

3ac04b7d-9a7a-41c6-8c9b-85e73c034969

Zhang, Zhefeng

fae2e491-f76b-4129-bf0e-643161366478

Langdon, Terence G

86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Zhang, Zhenjun, Qu, Zhan, Xu, Ling, Liu, Rui, Zhang, Peng, Zhang, Zhefeng and Langdon, Terence G (2022) A general physics-based hardening law for single phase metals. Acta Materialia, 231, [117877]. (doi:10.1016/j.actamat.2022.117877).

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Accepted/In Press date: 21 March 2022

e-pub ahead of print date: 25 March 2022

Published date: 1 June 2022

Additional Information: Funding Information: This work was financially supported by the Youth Innovation Promotion Association CAS (Grant No. 2021192 ), the National Natural Science Foundation of China (NSFC) under grant Nos. 51871223 , 51790482 , 52130002 and 52001153 , the KC Wong Education Foundation ( GJTD-2020-09 ) and the Chinese Academy of Sciences (Grants 174321KYSB20210002 ). The work of one of us was supported by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS (TGL) . Publisher Copyright: © 2022

Keywords: Dislocation annihilation, Strain hardening, Strength, Tensile testing, Uniform elongation