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。%Microstructure and mechanical properties of AA2024 after severe plastic deformation (SPD) and non-isothermal annealing wereinvestigated.The non-isothermal treatmentwascarried out on the severely deformed AA2024,andthe interaction between restoration and precipitation phenomenawas 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 electronmicroscope and electron backscatter diffraction illustrate that non-isothermal annealing of deformed AA2024 up to 250°C promotes the particle-free regions and also particle stimulated nucleation. Results show that through heating with the rate of 10°C/min up to 250°C, the ultimate shear strength and the hardness are maximum due to the presence ofS′/Sphases which have been detected during non-isothermal differential scanning calorimetry experiment. Also, recrystallization phenomenon occursin temperature range which includes the dissolution ofS′/Sphases. The concurrent recrystallization and dissolution ofS′/Sphase at 380°C have been verified by differential scanning calorimetry, mechanical properties, and optical microscope.
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