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Open AccessArticle

Quantification and Modelling of the Multiphase-Coupled Strengthening Effect in Al-Cu-Li Alloy

1
Light Alloy Research Institute, Central South University, Changsha 410083, China
2
State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha 410083, China
3
Kunming Metallurgical Research Institute, Kunming 650031, China
4
State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources, Kunming 650031, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1038; https://doi.org/10.3390/met9101038
Received: 26 August 2019 / Revised: 15 September 2019 / Accepted: 19 September 2019 / Published: 24 September 2019
(This article belongs to the Special Issue Phase Transformations in Aluminium Alloys)
After aging heat treatment, Al-Cu-Li alloy, in general, contains a variety of precipitated phases that jointly influence the age-strengthening effect on the alloy. In this work, a multiphase-coupled strengthening model has been established on the basis of a dislocation bypassing mechanism. The model considered situations with different proportions of two strengthening phases, T1 and θ′, and then obtained the dimension and volume fractions of these two strengthening phases via experiments. The values predicted by the multiphase-coupled strengthening model and the classical strengthening superposition model were compared with the measured results. The multiphase-coupled strengthening model established in this work had better consistency with the measured results. Moreover, the modeling method proposed in the paper can also be extended to the system having over two primary strengthening phases. Hence, the model can contribute towards the development of a multi-component precipitation strengthening process for aluminum alloys. View Full-Text
Keywords: Al-Cu-Li alloy; multiphase-coupled strengthening; precipitated phase; transmission electron microscope Al-Cu-Li alloy; multiphase-coupled strengthening; precipitated phase; transmission electron microscope
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MDPI and ACS Style

Zhang, J.; Li, Z.; Xu, F.; Bao, C. Quantification and Modelling of the Multiphase-Coupled Strengthening Effect in Al-Cu-Li Alloy. Metals 2019, 9, 1038.

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