Bonding of AZ91D Mg Alloy and Al Metal with Mg-Al Eutectic Alloy and its Application in Al Coating on AZ91D Mg Alloy

X.R. Li; Wei Liang; Xing Guo Zhao; L.P. Bian

doi:10.4028/www.scientific.net/MSF.610-613.866

Paper Titles

Research on the Rolling of AZ31 Strip Prepared by Twin Roll Casting
p.844

First-Principles Study of the Mechanical Properties of Mg-Based Alloys with FCC and Hexagonal Structure
p.848

Friction and Wear Properties of Magnetron Sputtered DLC/SiC Films on Magnesium Alloy
p.853

Mechanical Testing and Numerical Simulation of the Fracture Toughness of Magnesium Alloy AM60 under Impact Loading
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Bonding of AZ91D Mg Alloy and Al Metal with Mg-Al Eutectic Alloy and its Application in Al Coating on AZ91D Mg Alloy
p.866

Effect of TiN/CrN Multilayer Coating by Cathodic Arc Deposition on Wear and Corrosion Behaviours of AZ91D Magnesium Alloy
p.870

Preparation of Aluminum-Magnesium Alloys from Magnesium Oxide by Molten Salt Electrolysis Method
p.874

Structures of Zinc-Manganese Phosphate Film and Organic Coating on Magnesium Alloys
p.880

Effect of Ga on the Microstructure and Mechanic Al Properties of AZ81 Alloy
p.884

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Bonding of AZ91D Mg Alloy and Al Metal with Mg-Al Eutectic Alloy and its Application in Al Coating on AZ91D Mg Alloy

Abstract:

AZ91D magnesium alloy and Al metal were bonded successfully at 450 oC with load of 25 or 31 MPa by using Mg-Al eutectic alloy as the solder in atmosphere. The microstructure of the AZ91D/Al joints was characterized by SEM equipped with EDS, and the bond strength was measured through three-point bending test. It was revealed that reactive diffusion occurred obviously at the jointing part. The diffusion layers are composed of α-Mg + β-Mg17Al12, β-Mg17Al12, γ-Mg2Al3 and α-Al. The average bend strength of AZ91D/Al joints is 24 MPa with maximum value 28 MPa. To demonstrate the potential engineering application of this technology, AZ91D magnesium alloy plate was coated with Al foil and its corrosion resistance was tested. Electrochemical test results showed that the corrosion resistance of Al coated AZ91D magnesium alloy plate was greatly improved compared with the uncoated one.