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通过在汽车用AM50合金凝固过程中施加不同机械振幅的方法,研究了机械振幅分别为0、0.5、1、1.5、2和2.5 mm时对AM50合金的金相组织、夹杂物形貌与分布特征和力学性能的影响。结果表明,在合金凝固过程中施加机械振动,可以对合金中的析出相和晶粒起到明显的细化作用;随着机械振幅的增加,合金中圆形夹杂物的比例在不断减小,而条形和多角形夹杂物的比例在不断增加;当机械振幅增加至2.5 mm时,AM50合金的抗拉强度、屈服强度和断后伸长率分别达到234 MPa、111 MPa和4.5%,相对未施加振动的AM50合金分别增加了25.8%、29.1%和128%。
By means of applying different mechanical amplitudes during the solidification process of AM50 alloy for automobile, the microstructure, distribution and morphology of inclusions in AM50 alloy with mechanical amplitudes of 0, 0.5, 1, 1.5, 2 and 2.5 mm And mechanical properties. The results show that the application of mechanical vibration during the solidification of the alloy can obviously refine the precipitates and grains in the alloy. With the increase of mechanical amplitude, the proportion of the round inclusions in the alloy decreases continuously, While the proportion of strip and polygon inclusions is increasing. When the mechanical amplitude is increased to 2.5 mm, the tensile strength, yield strength and elongation at break of AM50 alloy reach 234 MPa, 111 MPa and 4.5% respectively, The AM50 alloy with applied vibration increased by 25.8%, 29.1% and 128% respectively.