1. Understanding the precipitation mechanism of copper-bearing phases in Al-Mg-Si system during thermo-mechanical treatment
- Author
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Hongmei Jin, Jin Zhang, Fu Ying, Xiaolin Chen, Xianxiang Huang, Renguo Guan, Di Tie, Yu Wang, and Fei Gao
- Subjects
Materials science ,Polymers and Plastics ,Composite number ,Alloy ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,Aluminium ,Scanning transmission electron microscopy ,Materials Chemistry ,Composite material ,Electrical conductor ,Precipitation (chemistry) ,Mechanical Engineering ,Metals and Alloys ,021001 nanoscience & nanotechnology ,Copper ,0104 chemical sciences ,chemistry ,Mechanics of Materials ,Ceramics and Composites ,engineering ,Deformation (engineering) ,0210 nano-technology - Abstract
We modified the morphology and distribution of copper-bearing precipitates in an Al-Mg-Si-Cu alloy and obtained ultra-high comprehensive properties through a modified thermo-mechanical treatment composed of aging and cold deformation. The precipitate evolution and atomic structure was observed by employing atomic resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Our results proved the existence of β′′/Q′ composite precipitates in rod-like morphology after aging treatment due to the inhibition of β′′ phase formation by copper atoms. We also revealed that the peak-aged phases transformed into in-situ reverse-transformed Guinier Preston zones (GP zones) during the deformation process. By the means of modifying the precipitates, we finally simultaneously obtained ultra-high strength (424.40 MPa) as well as favorable conductive properties (52.78%IACS), both of which surpassed three mainstream standards for high strength aluminum conductor.
- Published
- 2022