Microstructure and mechanical properties of Mg/Al bimetallic composite fabricated by compound casting

• Published in: Materials research innovations 2015-05, Vol.19 (sup4), p.S73-S78
• Main Authors: Ren, Q. S., Zhao, C. Z., Li, Z. B., Zhang, H. X.
• Format: Article
• Language: English
• Subjects: Aluminum base alloys; Anchoring strength; Bend strength; Bimetals; Intermetallic compounds; Intermetallics; Liquid-solid compound casting; Magnesium; Magnesium base alloys; Magnesium compounds; Mechanism; Mg/Al bimetal composite; Microstructure; Silicides; Weight reduction
• ISSN: 1432-8917; 1433-075X
• DOI: 10.1179/1432891715Z.0000000001520

The present study shows that magnesium and aluminium light alloys have been widely utilised in lightweight automotive applications, which is an important future research direction of energy conservation and environmental protection for automobile. In this study, Mg/Al bimetallic composite consisting of AZ91D magnesium alloy and ZL105 alumina alloy was fabricated by compound casting. The results prove that Mg/Al bimetallic composites can be successfully fabricated by liquid-solid compound casting. The structure of interfacial transition zone is made up of three different zones, i.e. Al-side transition zone, interfacial intermediate zone and Mg-side transition zone and α-Al, γ-Al 3 Mg 2 , β-Al 12 Mg 17 , Mg 2 Si and δ-Mg are the main specific composition of these zones. Bending strengths of pouring temperature from 620 to 700°C are different, while the maximal bending strength is 23·06 MPa under pouring temperature of 680°C.