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采用超声波搅拌方法制备了原位自生Mg_2Si/Al基复合材料,研究了超声波功率对复合材料凝固组织和力学性能的影响。结果表明:超声波搅拌不但能够细化初生Mg_2Si颗粒,改变凝固组织形貌,而且具有除气除杂功能,二者共同提高了Mg_2Si/Al基复合材料的力学性能。在本实验条件下:超声波功率为150 W时,Mg_2Si/Al基复合材料抗拉强度最高,为178 MPa;而伸长率则在超声波功率为100 W时最好,为4.94%。
In-situ Mg_2Si / Al composites were prepared by ultrasonic agitation and the effects of ultrasonic power on the microstructure and mechanical properties of the composites were investigated. The results show that ultrasonic agitation can not only refine the primary Mg_2Si particles, change the morphology of the solidified structure, but also remove the outgassing and impurity removal functions. Both of them enhance the mechanical properties of the Mg_2Si / Al matrix composites. Under this experimental condition, the tensile strength of Mg_2Si / Al matrix composites was the highest at 178 W at 150 W ultrasonic power, while the elongation was the best at 4.90% when the ultrasonic power was 100 W.