Bending properties and fracture mechanisms of ZnO and ZnAl₂O₄ coated aluminium borate whisker reinforced aluminium composites

Abstract

ZnO and ZnAl₂O₄ coated aluminium borate whisker (ABOw) reinforced pure aluminium composites were fabricated by squeeze casting. The effects of the coatings on the bending properties of the composites were investigated. On the analysis of fractographs, the fracture mechanisms of the composites under bending were also investigated. The results show that both ZnO and ZnAl₂O₄ coatings of ABOw can significantly increase the bending properties of ABOw reinforced aluminium composite. In ABOw/Al, ABOw/ZnO/Al and ABOw/ZnAl₂O₄/Al composites, the interface debonding, near interface fracture and near interface fracture and ABOw fracture dominate the fracture of each composite during bending respectively.

Keywords:

• Composites
• ZnO
• ZnAl₂O₄
• Coating
• Bending properties

The present work was supported by the China Postdoctoral Science Foundation, the Postdoctoral Science Foundation and the Natural Science Foundation of Heilongjiang Province of China.