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采用显微硬度仪、X射线衍射仪及透射电镜对ECAP法挤压后并进行热处理的7003铝合金进行了组织及力学性能研究。结果表明:经过4道次挤压后,随退火时间的延长和保温温度的升高,试样内部的缺陷减少,位错密度下降,试样的硬度下降,并确定退火温度160℃,保温时间1h为最佳的热处理工艺;通过对X-射线衍射结果分析,发现挤压后的材料在不同的退火温度处理后并没有新相出现,从峰值强度可以看出在160℃退火温度下,保温1h晶粒最为细小。
The microstructure and mechanical properties of 7003 aluminum alloy were studied by microhardness tester, X-ray diffractometer and transmission electron microscope after ECAP extrusion and heat treatment. The results show that after 4 passes of extrusion, with the increase of annealing time and holding temperature, the defects in the sample decrease, the dislocation density decreases and the hardness of the sample decreases. The annealing temperature is 160 ℃, holding time 1h for the best heat treatment process; X-ray diffraction analysis showed that the extrusion of the material at different annealing temperatures did not appear after the new phase, the peak intensity can be seen at 160 ℃ annealing temperature, insulation 1h grain is the most small.