纳米SiC颗粒增强AZ91D复合材料的制备及性能

Preparation and Properties of Nano-Sized SiC Particles Reinforced AZ91D Magnesium Matrix Composites

摘要:

利用高能超声辅助法制备纳米SiC颗粒（n-SiCp）增强AZ91D镁基复合材料（n-SiCp/AZ91D），并对其显微结构和室温力学性能进行测试分析。结果表明：纳米SiC颗粒的加入能够起到细化晶粒的作用，纳米颗粒在基体中的分布比较均匀，超声波辅助技术能够有效地分散纳米颗粒，在重力铸造下所制备的复合材料的抗拉强度、屈服强度和硬度均高于基体，尤其是屈服强度较基体提高了57%。

Abstract:

Magnesium matrix composites reinforced with nano-sized SiC particles (n-SiCp/AZ91D) were fabricated by high intensity ultrasonic assisted casting. The microstructure of the nanocomposites was investigated by optical microscopy, scanning electronic microscopy (SEM) methods and room-temperature mechanical properties were measured using a universal electronic material tester. The results showed that n-SiCp addition can refine the grains, and the distribution of n-SiCp in magnesium alloy melts is significantly improved by ultrasonic processing. Compared with the unreinforced AZ91D matrix, mechanical properties of the nanocomposites including tensile and yield strengths and hardness are remarkably improved; in particular the yield strength is increased by 57% after gravity permanent mould casting.