Al18 B4O33Bi／AI复合材料室温阻尼和力学性能

Damping capacity and tensile property of alumina borate hisker-reinforced aluminum composite in interface at room temperature

摘要:

为提高Al¹⁸ B⁴O³³ w/Al复合材料的室温阻尼性能，通过原位反应向复合材料的界面引入了低熔点金 属Bi.研究了涂层质量分数对涂覆后复合材料室温力学性能和阻尼性能的影响．结果表明，复合材料的力学 性能随着涂层质量分数的增加而降低；复合材料的阻尼性能则随涂覆量的增加而增加．涂覆复合材料的室温 阻尼值不仅强烈依赖于晶须表面涂覆物的质量分数而且依赖于应变振幅．涂覆复合材料在较低应变条件 (4×10_-4)下出现一个由位错机制产生的阻尼峰．当应变振幅超过6x10_-4，界面滑移成为主要的阻尼机制

Abstract:

To improve the capacity of AlISB4033w/Al at room temperature, bismuth with a low melting point was introduced into the interface of the composite by in situ reaction. The influence of the coating contents on the tensile properties and damping capacities of the coated composites at room temperature were investigated. The results indicated that the tensile properties of the coated composites decrease and the damping capacity in- creased with the increasing of coating contents, while the damping value of the coated composites strongly de- pend on not only the coating contents, but the strain amplitude. A damping peak in the coating composites at low strain amplitude ( about 4 x 10_-4) was observed, which attributed to dislocation mechanism. When the strain amplitude exceeded 6 x 10_-4, the damping was caused by the interfacial micro-slip