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为了开发新型高阻尼金属基复合材料,以高温烧结后的大晶粒钛酸钡(BaTiO3)陶瓷作为增强体,通过粉末冶金和热挤压方法制备钛酸钡颗粒增强铝基复合材料,并研究其阻尼特性和力学特性。动态力学分析结果表明,大晶粒钛酸钡陶瓷本身具有很好的阻尼性能,阻尼值可达0.12。但在纯铝基体中加入质量分数为10%BaTiO3制备的BaTiO3/Al复合材料的室温阻尼性能和铝基体相比并无明显改善,而450K以上的阻尼性能由于界面附近的位错运动而大幅度提高。钛酸钡增强体的本征阻尼性能未能充分发挥的原因在于钛酸钡颗粒与铝基体之间的界面结合不良,导致钛酸钡颗粒内部的能量耗散机制无法触动。复合材料的拉伸性能比相应纯铝基体的提高了42%,这意味通过改善界面结合和加入高含量的碳酸钡阻尼增强颗粒,有望获得高强度高阻尼金属基复合材料。
In order to develop new high-damping metal-matrix composites, barium titanate particles reinforced aluminum matrix composites were prepared by powder metallurgy and hot extrusion with BaTiO3 ceramic as the reinforcement. Its damping and mechanical properties. Dynamic mechanical analysis results show that the large grain barium titanate ceramic itself has good damping properties, the damping value of up to 0.12. However, the room temperature damping properties of BaTiO3 / Al composites prepared by adding 10% BaTiO3 in pure aluminum matrix are not significantly improved compared with that of aluminum matrix. However, the damping performance of 450T and above is greatly affected by the dislocation movement near the interface improve. The reason why the intrinsic damping property of the barium titanate reinforcing body fails to be fully exerted is that the interface between the barium titanate particles and the aluminum matrix is poorly bonded and the energy dissipation mechanism inside the barium titanate particles can not be touched. The tensile properties of the composites increased by 42% compared with the corresponding pure aluminum matrix, which means that it is expected to obtain high strength and high damping metal matrix composites by improving interfacial bonding and adding high content of barium carbonate damping enhancing particles.