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采用HJ-III超声冲击机对AZ91D镁合金进行了超声冲击处理,研究了不同超声冲击工艺参数对AZ91D镁合金的显微组织、显微硬度、表层残余应力、耐腐蚀性能的影响。试验结果表明:经过超声冲击处理后,冲击层金属的组织变细,AZ91D镁合金的表面产生了残余压应力,显微硬度、耐腐蚀性能均有不同程度的提高。在冲击电流1.5 A,冲击时间9 min时,与未超声冲击试样相比,AZ91D镁合金表面显微硬度提高了112.5%,耐腐蚀性提高了61.04%。超声冲击带来的表层金属晶粒细化和残余压应力是提高AZ91D镁合金显微硬度和耐腐蚀性能的主要原因。
The effect of ultrasonic impact on the microstructure, microhardness, surface residual stress and corrosion resistance of AZ91D magnesium alloy was studied by ultrasonic impacting with HJ-III ultrasonic impact machine. The experimental results show that the microstructure of the impact layer becomes thinner after ultrasonic impact treatment, and the residual compressive stress is produced on the surface of AZ91D magnesium alloy. The microhardness and corrosion resistance are all improved to some extent. Compared with the non-ultrasonic impact specimen, the microhardness of AZ91D magnesium alloy increased by 112.5% and the corrosion resistance increased by 61.04% at the impact current of 1.5 A and the impact time of 9 min. Ultrasonic impact caused by the surface grain refinement and residual compressive stress is to improve the AZ91D magnesium alloy microhardness and corrosion resistance of the main reasons.