摘要
采用超声辅助机械搅拌的方法制备了Si CP/AZ91D复合材料,研究了超声输出功率和处理时间对其凝固组织及拉伸力学性能的影响。结果表明,通过控制超声参数可以有效改善Si C颗粒在基体中的分布,并提高其力学性能。随着超声输出功率和处理时间的增加,Si C颗粒在基体中呈现先分散均匀后又团聚的趋势,同时力学性能先增加后降低,在700 W和30 s时复合材料的组织和力学性能均达到最佳。施加超声处理使复合材料的断口由脆性断裂为主转化为部分韧性断裂的混合断裂。
The composite SiCP/AZ91 D was prepared by ultrasonic-assisted mechanical stirring method, and the effect of the ultrasonic output power and treatment time on the solidified structure and mechanical properties of the composite was investigated. The results show that the distribution of SiC particles in the matrix and mechanical properties of the composite can be improved effectively by controlling the ultrasonic parameters. The Si C particles disperse in matrix at first and then reunite with the increase of the ultrasonic output power and treating time. At the same time, the mechanical properties of composites increase firstly and then decrease, and the microstructure and mechanical properties of composites are best when the output power is 700 W and the treating time is 30 s. The fracture mechanism of the composites transforms from pure brittle fracture to mixed fracture with partial ductile fracture after ultrasonic treatment.
出处
《铸造技术》
CAS
北大核心
2015年第6期1333-1336,1341,共5页
Foundry Technology
基金
航空科学基金资助项目(2012ZF56018
20125356009)
