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采用挤压铸造方法制备了Bi_2O_3涂覆Al_(18)B_4O_(33)晶须增强的铝基复合材料.探讨了Bi_2O_3含量、应变振幅、温度以及频率对涂覆复合材料阻尼性能的影响.并对涂覆后复合材料的阻尼机制作了初步的探讨.研究发现,涂覆复合材料在80和285℃附近存在2个明显的阻尼峰.涂覆复合材料的阻尼性能不仅强烈依赖于晶须表面涂覆物的含量,而且依赖于应变振幅.高温阻尼峰P2随涂覆物含量及应变振幅增加而提高的幅度更大.低温阻尼峰P1在涂覆复合材料中的阻尼机制归因于位错运动及由Bi引起的界面滑移.阻尼峰P2随应变振幅的增加阻尼机制由界面滑移机制向界面滑移与A1晶界滑移混合机制转变.
The Bi_2O_3-coated Al_ (18) B_4O_ (33) whisker reinforced aluminum matrix composites were prepared by squeeze casting method, and the effects of Bi_2O_3 content, strain amplitude, temperature and frequency on the damping properties of the composites were discussed. The damping mechanism of the composite was studied.The results show that there are two obvious damping peaks in the composite coating near 80 and 285 ℃ .The damping properties of the composite coating depend not only on the surface of the whisker And the dependence of the amplitude on the strain amplitude.The high-temperature damping peak P2 increases more with the increase of coating content and strain amplitude.The damping mechanism of the low-temperature damping peak P1 in the coating composites is attributed to the dislocation motion And the interfacial slip caused by Bi.The damping mechanism of the damping peak P2 changes from the interface slip mechanism to the interface slip and the A1 grain boundary slip mixing mechanism with the increase of strain amplitude.