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测量和分析了不同脉冲超声功率下ZL205A铝合金在距变幅杆端面不同纵向深度下组织的显微硬度,研究了脉冲超声功率对不同部位显微硬度的影响,并建立了ZL205A合金显微硬度与脉冲超声功率和纵向深度的关系.结果表明,距变幅杆端面相同距离处组织随着脉冲超声功率的提高,其显微硬度先增加后减小.同一脉冲超声功率条件下,随着纵向深度的增加,ZL205A合金显微硬度呈先降后升的趋势,铸件显微硬度最大值出现在600W纵深0 mm处,而铸件中部区域为超声施振后显微硬度弱区.“,”By measuring and analyzing the microhardness of ZL205A alloy at different vertical depths from the end face of the ultrasonic horn at different pulse ultrasonic power,the effects of pulsed ultrasonic power on microhardness of different parts were analyzed.The relationship between the microhardness of ZL205A alloy and the pulse ultrasonic power as well as depth was established.The results reveal that the microhardness is increased firstly and then decreased with the increase of the pulse ultrasonic power at the same distance from the end face of the ultrasonic horn.Under the same pulsed ultrasonic power condition,the microhardness of ZL205A alloy is decreased firstly and then increased with the increase of the depth of vertical zone.The maximum microhardness of the alloy samples can be observed at 0 mm in depth with power of 600 W,while the core area of the alloy sample belongs to microhardness weak zone after ultrasonic vibration.