本发明公开了一种制备血管支架用超细晶镁合金微管的方法,首先将挤压态镁合金坯料在400℃-470℃固溶处理48h-72h；在挤压比2-4,模具预热温度300℃-420℃,挤压道次2-8的情况下,对镁合金坯料进行往复挤压加工,得到晶粒尺寸0.3μm-5μm的挤压坯料然后切割成Φ20mm×10mm坯料；之后经过打孔、去污,打磨之后；将热挤压模具预热温度380℃-400℃,使用润滑剂对模具和坯料分别润滑,在挤压比为100-200下,对坯料直接进行正挤压；该方法制备的微细管材表面光洁,尺寸精度高,直线度高,组织细小均匀,延伸率高,并且腐蚀性能趋向于均匀腐蚀。

The invention discloses a method for preparing ultrafine-crystalline magnesium alloy microtubes for vascular stents. Firstly, an extruded magnesium alloy billet is solution treated at 400°C-470°C for 48h-72h; at an extrusion ratio of 2-4, a die When the preheating temperature is 300℃-420℃, and the extrusion passes are 2-8, the magnesium alloy billet is subjected to reciprocating extrusion processing to obtain an extruded billet with a grain size of 0.3μm-5μm and then cut into a Φ20mm×10mm billet; After drilling, decontamination, and polishing; preheat the hot extrusion die to a temperature of 380°C-400°C, use a lubricant to lubricate the die and the blank separately, and directly correct the blank when the extrusion ratio is 100-200 Extrusion: The micropipes prepared by this method have smooth surface, high dimensional accuracy, high straightness, fine and uniform structure, high elongation, and the corrosion performance tends to be uniform corrosion.