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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。
The microstructure and mechanical properties of AA2024 alloy subjected to severe plastic deformation and non-isothermal annealing were studied. Non-isothermal annealing of AA2024 alloy with severe plastic deformation was carried out to study the relationship between recovery and precipitation. The results of differential scanning calorimetry, hardness and punching shear test show that the static recovery and the dissolution of GBP / Cu-Mg clusters exist simultaneously after non-isothermal annealing. Scanning electron microscopy and backscattered electron diffraction results show that the non-isothermal annealing of AA2024 alloy to 250 ° C promotes nucleation without precipitation and particle excitation. By 10 ° C / min heated to 250 ° C, due to the S / S ’phase, the alloy to achieve the maximum shear strength and hardness. Differential scanning calorimetry, mechanical properties and optical microscopy results show that recrystallization and S / S ’dissolution coexist when heated to 380 ° C.