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以Mg97Zn1Y2合金为对象,利用超声振动处理制备半固态浆料,研究了半固态流变挤压成形工艺中挤压压力对合金组织及性能的影响.经过超声处理制备的半固态浆料直接浇注得到的合金中α-Mg晶粒尺寸减小,LPSO相也得到细化并均匀分布于基体中.经过挤压成形的合金,LPSO相得到进一步细化,在块状LPSO相上出现条状相,并且随着压力增大,条状相数量增多.合金抗拉强度和伸长率随着压力增大先升高后基本保持不变.最优挤压压力为100 Mpa,此时合金的抗拉强度和伸长率分别为234 Mpa和11.6％.“,”The semi-solid slurry of Mg97Zn1Y2 alloy was prepared by ultrasonic vibration,and effects of rheo-squeeze pressure on microstructure and properties of Mg97Zn1Y2 alloy were investigated.The size of α-Mg grains in the alloy obtained by ultrasonic treatment is decreased,and the LPSO structure can be refined and uniformly distributed in the matrix after ultrasonic treatment.After rheo-squeeze casting,the LPSO structure is further refined with appearance of strip phase on the block LPSO structure.With the increase of pressure,the number of strip phase is increased.The tensile strength and elongation of alloy are increased at first and then keep constant with the increase of pressure.The tensile strength and elongation of the alloy reach 234 MPa and 11.6％,respectively,with the pressure of 100 MPa.