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以AZ91D镁合金为基体,采用搅熔铸造法将球磨后的粉煤灰漂珠颗粒加入到熔融态基体中,设置球磨漂珠质量分数(2%、6%和10%)和搅拌时间(3min和6min),成功制备了Mg2Si/AZ91D复合材料。采用金相分析、XRD分析和动态机械热分析等方法研究了铸态和固溶态Mg2Si/AZ91D复合材料的显微组织、成分及阻尼性能。研究表明:与AZ91D镁合金相比,加入球磨漂珠颗粒后制备的Mg2Si/AZ91D复合材料中生成了Mg2Si相,而且随着漂珠质量分数的增加,Mg2Si相呈现不规则形状,固溶后Mg2Si相呈现均匀块状。随着漂珠质量分数的增加,Mg2Si/AZ91D复合材料的阻尼性能越好,搅拌时间6min制备的复合材料阻尼性能高于搅拌时间3min制备的复合材料的阻尼性能,并且固溶态的阻尼性能优于铸态。在室温下,Mg2Si/AZ91D复合材料阻尼性能可用位错理论来解释。
The AZ91D magnesium alloy was used as matrix, and the ball mill fly ash pellets were added into the molten matrix by the method of billet casting. The mass fraction of ball milling beads (2%, 6% and 10%) and stirring time And 6min), successfully prepared Mg2Si / AZ91D composites. The microstructure, composition and damping properties of as-cast and solid solution Mg2Si / AZ91D composites were studied by means of metallographic analysis, XRD and dynamic mechanical thermal analysis. The results show that compared with AZ91D magnesium alloy, the Mg2Si phase is formed in the Mg2Si / AZ91D composite prepared by adding ball milling beads, and the Mg2Si phase is irregular with the increasing of the mass fraction of drift beads. Phase presents a uniform block. The damping property of Mg2Si / AZ91D composites is better with the increasing of mass fraction of floating beads, and the damping capacity of the composites prepared with stirring time is higher than that of the composites prepared with mixing time of 3min. The damping properties of Mg2Si / AZ91D composites are excellent In the as-cast. At room temperature, the damping properties of Mg2Si / AZ91D composites can be explained by the dislocation theory.