期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 27, 期 1, 页码 1-9出版社
ELSEVIER
DOI: 10.1016/S1003-6326(17)60001-3
关键词
AA2024 alloy; severe plastic deformation; non-isothermal annealing; microstructure; mechanical properties
资金
- research board of Sharif University of Technology
Microstructure and mechanical properties of AA2024 after severe plastic deformation (SPD) and non-isothermal annealing were investigated. The non-isothermal treatment was carried out on the severely deformed AA2024, and the interaction between restoration and precipitation phenomena was investigated. Differential scanning calorimetry, hardness and shear punch tests illustrate that static recovery and dissolution of GPB zones/Cu Mg co-clusters occur concurrently through non-isothermal annealing. Scanning electron microscope and electron backscatter diffraction illustrate that non-isothermal annealing of deformed AA2024 up to 250 degrees C promotes the particle-free regions and also particle stimulated nucleation. Results show that through heating with the rate of 10 degrees C/min up to 250 degrees C, the ultimate shear strength and the hardness are maximum due to the presence of S'/S phases which have been detected during non-isothermal differential scanning calorimetry experiment. Also, recrystallization phenomenon occurs in temperature range which includes the dissolution of S'/S phases. The concurrent recrystallization and dissolution of S'/S phase at 380 degrees C have been verified by differential scanning calorimetry, mechanical properties, and optical microscope.
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