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采用硬度测试和差示扫描量热法研究时效前不同冷轧变形量对2519A铝合金析出动力学的影响。根据DSC曲线,采用单升温速率法计算合金的激活能;采用透射电子显微镜观察冷轧和峰时效状态下合金的微观组织。结果表明:随着冷轧变形量从7%增加至40%,合金的时效硬化能力降低,激活能升高。当冷轧变形量为15%时,在冷轧态合金组织中观察到密度不均匀的位错组织,在峰时效状态合金组织中观察到不均匀分布的θ′相。不均匀分布的θ′相可能是造成合金时效硬化能力降低和激活能升高的原因。
The effects of different cold rolling deformation on the precipitation kinetics of 2519A aluminum alloy before aging were studied by hardness test and differential scanning calorimetry. According to the DSC curve, the activation energy of the alloy was calculated by the single heating rate method. The microstructure of the alloy was observed by transmission electron microscopy. The results show that as the amount of cold rolling deformation increases from 7% to 40%, the age hardening capacity decreases and the activation energy increases. When the amount of cold-rolling deformation is 15%, dislocation microstructure with uneven density is observed in the cold-rolled alloy structure, and the θ ’phase is unevenly distributed in the peak-aged alloy structure. The non-uniform distribution of θ ’phase may be responsible for the decrease of the age-hardening ability and the activation energy of the alloy.