Abstract
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.
Highlights
Owing to their characteristics such as their high specific modulus and specific strength, Al-Cu-Li alloys have been widely used in the lightweight structures of modern aeronautic and aerospace vehicles [1,2]
The T1 phase precipitated during the aging process is a plate-like precipitated phase with {111} plane as the habit plane, and the θ0 phase is a plate-like precipitated phase with {001} as the habit plane [6,7], accompanied by a small amount of δ0 and σ phases [8,9,10]
Ashby [11] derived the modified Orowan equation and concluded that the strengthening effect of the precipitated phase is closely related to the spacing between the particles of the precipitated phases
Summary
Owing to their characteristics such as their high specific modulus and specific strength, Al-Cu-Li alloys have been widely used in the lightweight structures of modern aeronautic and aerospace vehicles [1,2]. These characteristics primarily result from the highly efficient precipitation-strengthening phenomenon, in which the precipitated phases playing major strengthening roles are the T1 (Al2 CuLi) and θ0 (Al2 Cu) phases [3,4]. Ashby [11] derived the modified Orowan equation and concluded that the strengthening effect of the precipitated phase is closely related to the spacing between the particles of the precipitated phases.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
