Microstructure and Properties of AA6061/SiCp Composites Sintered under Ultra High-Pressure

• Main Authors: Lei Xu, Erkuo Yang, Yasong Wang, Changyun Li, Zhiru Chen, Guofa Mi
• Format: Article
• Language: English
• Published: MDPI AG 2020-10-01
• Series: Applied Sciences
• Subjects: characterization; aluminum alloys; composites; powder methods; fracture behavior
• Online Access: https://www.mdpi.com/2076-3417/10/20/7363
• ISSN: 2076-3417

Ultra high-pressure sintering (UHPS) was used to prepare AA6061/SiCp composites with different contents and the effect of sintering temperatures on microstructure and mechanical properties was investigated in this study. The results showed that a uniform distribution of nano-SiC particles (N-SiCp) is obtained by the UHPS method. With the increase in N-SiCp contents, the higher hardness and better wear resistance could be inspected. The interfacial reactions and Al₄C₃ phase appeared above 550 °C. The relative density of composites first increased and then decreased; with the temperature raising it reached 99.58% at 600 °C. The hardness and wear property showed the same trend with the hardness reaching 52 HRA and wear rate being 1.0 × 10⁻⁶ g/m at 600 °C. Besides, the wear mechanism of the composites is mainly composed of abrasive wear and adhesive wear.