5083铝合金铸锭均匀化退火的组织与性能

摘要：为研究5083铝合金均匀化退火后的组织及力学性能，利用光学显微镜、扫描电镜、万能力学实验机，分析了5083铝合金铸锭不同均匀化退火工艺后组织演变与力学性能变化。结果表明：随均匀化退火温度的提高，铸锭枝晶卢相大部分溶解，剩余卢相有球化的趋势。常温力学性能测试表明，均匀化退火后，拉伸强度明显提高，延伸率下降，显示脆性断裂；高温瞬时拉伸表明，均匀化退火降低了铸锭的拉伸强度，显示解理断裂。

Homogenizing annealing microstructure and mechanical properties of 5083 aluminum alloy ingot

Aimed at the study of 5083 aluminum alloy homogenization organization and mechanical properties after annealing, this paper is an analysis of the evolution of microstructures and mechanical properties of 5083 aluminum alloy ingot after homogenizing annealing using optical microscopy （ OM ） , scanning electron microscopy（SEM） and universal mechanical testing machine. The results indicate that increasing homogenizing annealing triggers the dissolution of most eutectic/3 phase in ingot, giving the re- maining/3 phase a tendency to nodulizing. Room temperature mechanical properties show that homogeni- zing annealing is followed by a significant increase in tensile ,trength and decrease in ductility, an indica- tion of brittle fracture. High temperature instantaneous tensile tests suggest that homogenizing annealing tends to decrease tensile strength, showing cleavage facture.