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采用HJ-III型超声冲击设备对AZ91D镁合金表面进行了冲击处理,利用光学显微镜和高倍透射电子显微镜研究了超声冲击表层的微观组织。对经超声冲击处理和未冲击处理的AZ91D镁合金的耐磨性能进行了对比研究。用扫描电镜和显微硬度计研究了超声冲击处理对磨损表面形貌和显微硬度的影响。结果表明,超声冲击使AZ91D镁合金的表面出现了严重的塑性变形,塑变层深度约为120μm,表面组织明显得到细化。超声冲击可极大的提高AZ91D镁合金的耐磨性能和显微硬度。耐磨性能和显微硬度随超声冲击电流的增加和冲击时间的延长而提高。与未冲击试样相比,在冲击时间为9 min,冲击电流为1.5 A时,冲击试样的显微硬度和耐磨性分别提高了112.5%和57.39%。
The surface of AZ91D magnesium alloy was impacted by HJ-III ultrasonic impact equipment. The microstructure of ultrasonic impact surface was studied by optical microscope and high transmission electron microscope. The wear resistance of AZ91D magnesium alloy treated by ultrasonic impacting and non-impacting were compared. The effects of ultrasonic impact treatment on the morphology and microhardness of the wear surface were studied by scanning electron microscopy and microhardness tester. The results show that ultrasonic impact on the surface of AZ91D magnesium alloy shows severe plastic deformation. The depth of plastic deformation layer is about 120μm, and the surface texture is obviously refined. Ultrasonic impact can greatly improve the wear resistance of AZ91D magnesium alloy and microhardness. The wear resistance and microhardness increase with the increase of the ultrasonic impact current and the impact time. Compared with the non-impact specimen, the impact strength and abrasion resistance of the impact specimen increased by 112.5% and 57.39% respectively when the impact time was 9 min and the impact current was 1.5 A.