以AM60镁合金和硅为原材料, 在原位反应的基础上, 采用高能超声处理来改善原位反应的条件, 制备出以Mg2Si为增强相的镁基复合材料; 采用XRD对复合材料物相进行分析, 用光学显微镜对其显微组织进行观察, 同时与未施加超声处理的复合材料进行了对比。结果表明: 超声作用下原位生成的Mg2Si增强相更加细小, 团聚现象得到改善;熔体在高能超声作用下, 声空化产生的瞬态高温、高压及声流效应是增强相细化的主要原因。

With AM60 magnesium alloy and silicon as raw materials, based on in-situ reaction using high-energy ultrasonic treatment method to improve the conditions, magnesium matrix composites with Mg2Si as reinforcing phase were synthesized. By means of X-ray diffraction and optical microscopy, the phase and microstructure of the composites were analyzed and observed. It was compared with the composites obtained without ultrasonic treatment. The results show that the Mg2Si reinforcing phases generated by the ultrasonic in-situ reaction were smaller and the agglomeration phenomenon was improved. The main reasons of the refinement of reinforcing phase were transient high temperature, high pressure and acoustic streaming effect from acoustic cavitation under the high-energy ultrasonic treatment.