退火温度对5A02铝合金组织与力学性能的影响

The effect of annealing temperature on the microstructure and mechanical properties of 5A02 aluminum alloy

本文研究了退火温度对5A02铝合金管材微观组织和力学性能的影响。使用扫描电子显微镜(SEM)、能谱分析(EDS)以及电子背散射衍射(EBSD)对300~500℃下退火1 h试样的微观组织进行了分析,包括第二相的分布、成分,以及晶粒的形貌、尺寸。此外,还对不同退火温度下的管材试样进行了室温拉伸试验。结果表明,在所有退火态样品中,在300℃进行退火的样品拥有最高的强度,其屈服强度和抗拉强度分别为133.4 MPa和195.7 MPa,此时样品处于纤维组织向再结晶组织转化的过渡阶段。当退火温度进一步提高,样品的再结晶晶粒发生长大,位错密度降低,这使得样品的强度开始下降。当退火温度上升至500℃时,管材试样的屈服强度和抗拉强度分别下降至99.2 MPa和175.8 MPa。

This article investigates the effect of annealing temperature on the microstructure and mechanical properties of 5A02 aluminum alloy tubes.Scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),and electron backscatter diffraction(EBSD)were used to analyze the microstructure of samples annealed at 300-500℃for 1 hour,including the distribution and composition of the second phase,as well as the morphology and size of the grains.The tube samples annealed at different temperatures were subjected to room-temperature tensile tests.The results show that among all annealed samples,the sample annealed at 300℃has the highest strength,with yield strength and tensile strength of 133.4 MPa and 195.7 MPa,respectively.At this stage,the microstructure of sample is in the transition phase from fibrous texture to recrystallized texture.As the annealing temperature of the sample increases,the recrystallized grains grow,the dislocation density decreases,and the strength decreases.When the annealing temperature rises to 500℃,the yield strength and tensile strength of the tube sample decrease to 99.2 MPa and 175.8 MPa,respectively.