Influence of TiO₂ on Microstructure and Mechanical Properties of Al₂O_3p/Steel Matrix Composites Prepared by Squeeze Casting

• Main Authors: YU Jing, LU De-hong, WANG Jian, JIANG Ye-hua
• Format: Article
• Language: zho
• Published: Journal of Materials Engineering 2016-12-01
• Series: Journal of Materials Engineering
• Subjects: squeeze casting; TiO₂; Al₂O₃ particle; steel matrix composite; interface; mechanical property
• Online Access: http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.12.014
• ISSN: 1001-4381; 1001-4381

By adding TiO₂ powder into the preform, Al₂O₃ particles reinforced 1065 steel matrix composites were prepared by squeeze casting. The influence of TiO₂ on the microstructure and mechanical properties of the composites was investigated. The results indicate that TiO₂ and Al₂TiO₅ were produced at the interface between matrix and Al₂O₃ particles. Hardness and three point bending strength reach 39.0HRC and 743.94MPa respectively, which was 10.0% and 26.4% higher than those of the composites without TiO₂ powder. Fracture morphologies show that there is no crack at the interface and Al₂O₃ particles are transcrystalline rupture. The interface bonding is improved by TiO₂ powder for the Al₂O₃ particles reinforced composites, and the mechanical properties of the composites increase.