Effects of non-isothermal annealing on microstructure and mechanical properties of severely deformed 2024 aluminum alloy  

非等温退火对剧烈变形2024铝合金显微组织和力学性能的影响（英文）

作　　者：Saeed KHANI MOGHANAKI Mohsen KAZEMINEZHAD 

机构地区：[1]Department of Materials Science and Engineering,Sharif University of Technology,Azadi Avenue 11155-9466,Tehran,Iran

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第1期1-9,共9页中国有色金属学报（英文版）

基　　金：research board of Sharif University of Technology for the financial support and the provision of the research facilities used in this work

摘　　要：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 ℃ promotes the particle-free regions and also particle stimulated nucleation. Results show that through heating with the rate of 10 ℃/min up to 250 ℃, 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 ℃ have been verified by differential scanning calorimetry, mechanical properties, and optical microscope.研究剧烈塑性变形和非等温退火AA2024合金的显微组织和力学性能。对剧烈塑性变形的AA2024合金进行非等温退火,研究回复和析出之间的关系。差示扫描量热法、硬度和冲剪试验结果表明,经过非等温退火处理,静态回复和GBP区/Cu-Mg团簇的溶解同时存在。扫描电子显微镜和背散射电子衍射结果表明,AA2024合金非等温退火至250°C促进了无沉淀区和粒子激发形核。通过10°C/min加热至250°C,由于S/S′相的存在,合金的抗剪强度和硬度达到最大。差示扫描量热法、力学性能和光学显微镜结果表明,加热至380°C时,再结晶和S/S′相的溶解共同存在。

关 键 词：AA2024 alloy severe plastic deformation non-isothermal annealing MICROSTRUCTURE mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]