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研究了超声功率、超声处理时间和超声处理温度对原位自生Mg2Si/AZ91复合材料性能的影响,并设计正交试验优化工艺。结果表明,超声处理后的复合材料铸态组织中,基体晶粒细化明显,初生Mg2Si相由粗大块状转变为近球状,共晶β-Mg17Al12相析出较少,并呈断网状。当超声处理温度为690℃、超声功率为700 W、超声处理为65s时,复合材料的抗拉强度和伸长率最佳,抗拉强度由未超声处理时的167 MPa提高至209 MPa,伸长率由未超声处理时的1.8%提升至超声处理后的3.4%,分别提升了25%和89%。
The effects of ultrasonic power, ultrasonic treatment time and ultrasonic treatment temperature on the properties of in-situ Mg2Si / AZ91 composites were studied, and the orthogonal experiment was designed. The results show that the grain refinement of the matrix in the as-cast composites after ultrasonic treatment is obvious. The primary Mg2Si phase changes from coarse to massive, while the eutectic β-Mg17Al12 phase precipitates less and breaks off. When the ultrasonic treatment temperature is 690 ℃, the ultrasonic power is 700 W and the ultrasonic treatment is 65s, the tensile strength and elongation of the composites are the best, the tensile strength increases from 167 MPa without sonicating to 209 MPa, The rate increased from 1.8% for the nonsonic treatment to 3.4% for the sonicated treatment, by 25% and 89% respectively.