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研究了未处理、P和La合金化处理、超声处理和超声-合金化复合处理对Al-20Mg2 Si合金凝固组织和力学性能的影响,并研究了复合处理条件下不同的超声参数对初生Mg2Si相大小和力学性能的影响.结果表明,经过超声-合金化复合处理后,合金的凝固组织和力学性能显著改善,其效果好于单一的合金化处理或超声处理;与未处理试样相比,初生Mg2Si相的尺寸减小68％,抗拉强度提高62.3％,伸长率提高47％.复合处理条件下,随着超声功率的增加,初生Mg2 Si相尺寸逐渐减小,力学性能逐步提高;随着处理时间延长,初生Mg2Si相尺寸先减小再增加,但力学性能逐渐提高;随着超声处理温度的提高,初生Mg2Si相尺寸先减小后增加,力学性能变化规律与之对应.“,”Influences of some treating ways,such as untreated,alloying treatment of P and La,ultrasonic treatment and compound treatment of ultrasonic and alloying,on solidification structure and mechanical properties of Al20Mg2 Si were investigated.Effects of ultrasonic power,ultrasonic treatment time and ultrasonic treatment temperature on size of Mg2Si phase and mechanical properties of the alloy were investigated under the condition of compound treatment.The results reveal that after compound treatment,the solidification structure and mechanical properties of the alloy are improved remarkably,and the effects are superior to those of single alloying treatment or ultrasonic treatment.Compared with untreated samples,the size of the primary Mg2 Si phase is decreases by 68 ％,and the tensile strength and elongation of the alloy are increased by 62.3％ and 47％,respectively.With the increase of ultrasonic power,the size of primary Mg2Si phase is decreased gradually,and the mechanical properties are increased gradually.With the increase of ultrasonic treatment time,the size of primary Mg2 Si phase is decreased at first and then increased,however,the mechanical properties of the alloy are increased gradually.With the increase of ultrasonic treatment temperature,the size of primary Mg2Si phase is decreased at first and then increased,and the change rule of mechanical properties of the alloy is corresponded with it.