超声冲击MB8镁合金的耐磨性与显微硬度试验（英文）

发布时间：2018-03-30 15:55

本文选题：超声冲击　切入点：MB镁合金　出处：《稀有金属材料与工程》2017年07期

【摘要】：采用HJ-III型超声冲击设备对MB8镁合金表面进行冲击处理,利用高倍透射电子显微镜研究了超声冲击表层的微观组织及晶粒细化机制。对经超声冲击处理和未冲击处理的MB8镁合金的耐磨性能进行了对比研究。采用扫描电镜和显微硬度计分别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MB8镁合金的表面出现了严重的塑性变形,塑变层深度约为180μm,表面组织明显得到细化。耐磨性能和显微硬度随超声冲击时间的延长而提高。与未冲击试样相比,在冲击时间为6 min时,冲击电流为1.2 A时,冲击试样的显微硬度和耐磨性分别提高了102.8%和51.83%。
[Abstract]:The surface of MB8 magnesium alloy was treated with HJ-III ultrasonic impact equipment. The microstructure and grain refinement mechanism of ultrasonic impact surface layer were studied by high power transmission electron microscope (TEM). The wear resistance of MB8 magnesium alloy treated by ultrasonic impact treatment and non-impact treatment was compared and studied. Scanning electrolysis was used to study the wear resistance of MB8 magnesium alloy. The effects of ultrasonic impact treatment on the morphology and microhardness of worn surface were studied by mirror and microhardness tester respectively. The results showed that ultrasonic impact caused severe plastic deformation on the surface of MB8 magnesium alloy. The depth of the plasticized layer is about 180 渭 m, and the surface structure is obviously refined. The wear resistance and microhardness increase with the prolongation of the ultrasonic impact time. Compared with the non-impact specimen, the impact current is 1.2A when the impact time is 6 min. The microhardness and wear resistance of impact samples were increased by 102.8% and 51.833%, respectively.
【作者单位】：华东交通大学;载运工具与装备教育部重点实验室;
【基金】：National Natural Science Foundation of China(51265013) Natural Science Foundation of Jiangxi Province(20151BAB206007)
【分类号】：TG146.22;TG663

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