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采用搅拌摩擦挤压法来将镁屑制成镁线。在搅拌摩擦挤压过程中,探头的旋转速率分别为150、250和355 r/min,切入速率固定为20 mm/min。研究对比试样和搅拌摩擦挤压试样的显微组织演化、摩擦磨损行为和耐腐蚀性能。通过光学显微镜和扫描电镜对样品的显微结构进行表征。力学性能的评价包括显微硬度和干滑动磨损测试。通过动电位极化测试对挤出试样的耐腐蚀性能进行表征。结果表明,挤出试样具有较好的表面质量,搅拌摩擦挤压过程有利于改善机械加工碎屑的硬度和耐磨性,同时,所得到的线条具有足够的耐腐蚀性。这些结果表明搅拌摩擦挤压法是一种将机械加工产生的镁屑转变成有用的镁线的有效方法。
Stirred by friction extrusion method to magnesium wire made of magnesium wire. During the process of friction stir extrusion, the probe rotation rates were 150, 250 and 355 r / min, respectively, and the cut-in rate was fixed at 20 mm / min. The microstructure evolution, friction and wear behavior and corrosion resistance of the control samples and the friction stir extruded specimens were studied. The microstructure of the samples was characterized by light microscopy and scanning electron microscopy. The evaluation of mechanical properties includes microhardness and dry sliding wear testing. Corrosion resistance of extruded samples was characterized by potentiodynamic polarization test. The results show that the extruded sample has better surface quality. The process of friction stir extrusion is helpful to improve the hardness and wear resistance of machined chips, and the resulting lines have sufficient corrosion resistance. These results show that the friction stir extrusion method is an effective method to convert magnesium turnings produced by machining into useful magnesium wire.