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将Φ40mm×50mm的AZ31镁合金圆棒经变通道角挤压(Change channel angular extrusion,CCAE)成厚度约为5mm的板材。通过TEM观察表明,AZ31镁合金的形核机制主要是动态再结晶形核。结果表明,经CCAE变形后,由晶粒的剪切破碎和动态再结晶使得镁合金晶粒明显细化。内角、挤压比、挤压温度和挤压速率等对板材的显微组织结构有重要的影响。在100~450℃温度范围内进行CCAE变形,AZ31镁合金的晶粒尺寸随变形温度的升高而增大。AZ31镁合金经CCAE热变形后,合金的综合力学性能得到改善。
The Φ40mm × 50mm AZ31 magnesium alloy round bar was changed into channel thickness extrusion (CCAE) to a thickness of about 5mm. The TEM observation shows that the nucleation mechanism of AZ31 magnesium alloy is mainly dynamic recrystallization nucleation. The results show that after the CCAE deformation, the grains of magnesium alloy are obviously refined by the shearing and dynamic recrystallization. Internal angle, extrusion ratio, extrusion temperature and extrusion rate of the microstructure of the sheet have a significant impact. CCAE deformation was carried out in the temperature range of 100 ~ 450 ℃. The grain size of AZ31 magnesium alloy increased with the increase of deformation temperature. AZ31 magnesium alloy after CCAE hot deformation, the alloy’s mechanical properties have been improved.