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利用光学显微镜及X射线衍射仪对轧制后时效的Al-6Zn-2Mg-2Cu铝合金的显微组织及MgZn_2相的体积分数进行表征,研究了轧制变形量对Al-6Zn-2Mg-2Cu铝合金时效处理后的组织及MgZn_2相析出动力学的影响,结果表明:轧制变形后该合金显微组织沿轧制方向呈流线型分布,且随轧制变形量的增大,时效态组织出现再结晶现象;时效过程中MgZn_2相优先在晶界处析出;随着轧制变形量的增大,MgZn_2相的析出速度增大;结合试验数据,由JMAK方程计算两种轧制变形量的Al-6Zn-2Mg-2Cu铝合金在同一时效处理温度下,经过不同的时效时间,MgZn_2析出相的体积分数的拟合曲线分别为y=1-exp(-0.00060t~(0.5306))和y=1-exp(-0.00063t~(0.5276))。
The microstructure and the volume fraction of MgZn 2 phase in Al-6Zn-2Mg-2Cu aluminum alloy after aging were characterized by optical microscopy and X-ray diffraction. The effects of rolling deformation on the microstructure of Al-6Zn-2Mg- The results show that the microstructure of the alloy presents streamlined distribution along the rolling direction after rolling deformation, and with the increase of rolling deformation, the aging microstructure appears Recrystallization phenomenon; MgZn_2phase preferentially precipitated at the grain boundary during the aging process; the precipitation rate of MgZn_2phase increases with the increase of rolling deformation; and the combination of experimental data, the two rolling deformations of Al The curves of the volume fraction of MgZn 2 precipitates with different aging time at the same aging temperature of -6Zn-2Mg-2Cu aluminum alloy are y = 1-exp (-0.00060t ~ (0.5306)) and y = 1-exp (-0.00063t to (0.5276)).