Quench sensitivity of Al–Cu–Mg alloy thick plate

The quench sensitivity of Al–Cu–Mg alloy was investigated at different thicknesses of the thick plate. The quenching process was simulated via finite element analysis (FEA); time–temperature–property (TTP) curves and time–temperature–transformation (TTT) curves were obtained through hardness test an...

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Bibliographic Details
Published in:Rare metals 2023-09, Vol.42 (9), p.3161-3169
Main Authors: Yin, Yuan, Luo, Bing-Hui, Bai, Zhen-Hai, Jing, Hui-Bo
Format: Article
Language:English
Subjects:
Aluminum base alloys
Biomaterials
Chemistry and Materials Science
Coarsening
Cooling rate
Copper
Copper base alloys
Electron microscopy
Energy
Finite element method
Hardness tests
Heat treating
Magnesium
Materials Engineering
Materials Science
Metallic Materials
Microscopy
Microstructure
Nanoscale Science and Technology
Physical Chemistry
Quenching
Scanning electron microscopy
Sensitivity analysis
Thick plates
Transformations
Transmission electron microscopy
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Summary:The quench sensitivity of Al–Cu–Mg alloy was investigated at different thicknesses of the thick plate. The quenching process was simulated via finite element analysis (FEA); time–temperature–property (TTP) curves and time–temperature–transformation (TTT) curves were obtained through hardness test and differential scanning calorimetry (DSC) test; and the microstructural observation was carried out by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Experimental results exhibit that the quench cooling rate decreases dramatically from the surface to the center of the plate, and the inhomogeneous quenching causes the difference in microstructure. With the decrease in quench cooling rate, constituent particles are coarsening gradually; the quantity of T-phase (Al 20 Cu 2 Mn 3 ) increases and the S-phase (Al 2 CuMg) decreases. According to the precipitation kinetics analysis, the decrease in S-phase is caused by the increase in precipitate activation energy. So that the center of the plate shows the highest quenching sensitivity, which is consistent with the analysis of time–temperature–property curves and time–temperature–transformation curves.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-018-1196-6