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通过光学显微镜、扫描电镜、X射线衍射分析、硬度实验和拉伸实验等方法,研究不同轧制变形量及后续退火处理对均匀化态5052铝合金组织与性能的影响。研究结果表明,随着轧制变形量的增加,等轴晶沿着轧制方向明显地被拉长。由于轧制变形量的增加,加工硬化效应导致合金强度升高,硬度下降。当轧制变形量为87%时,抗拉强度可达325 MPa,但是伸长率只有2.5%。经退后处理后,大量的第二相析出。随着退火温度的升高,第二相析出增多,并且明显弱化加工硬化效应。当经过300°C处理4 h后,伸长率可达~23%,抗拉强度降至212MPa,此时综合力学性能恢复到均匀化状态。
The effects of different rolling deformation and subsequent annealing treatment on microstructure and properties of homogenized 5052 aluminum alloy were studied by means of optical microscope, scanning electron microscopy, X-ray diffraction analysis, hardness test and tensile test. The results show that with the increase of rolling deformation, the equiaxed grains are obviously elongated along the rolling direction. As the amount of rolling deformation increases, the work hardening effect causes the alloy strength to increase and the hardness decrease. When the amount of rolling deformation is 87%, the tensile strength can reach 325 MPa, but the elongation is only 2.5%. After retreat processing, a large number of second phase precipitation. As the annealing temperature increases, the precipitation of the second phase increases and the work hardening effect is significantly weakened. When treated at 300 ° C for 4 h, the elongation reaches up to ~ 23% and the tensile strength decreases to 212 MPa. At this time, the comprehensive mechanical properties return to the uniform state.