Bond characteristics of Al/Mg clad materials produced by vacuum roll bonding

The A1050/AZ31 clad materials were produced by vacuum roll bonding. The effects of rolling temperature and reduction rate on the interface of A1050/AZ31 clad materials were investigated, and the fracture behaviors of A1050/AZ31 interface were studied. A very thin intermetallic compound layer was formed at the A1050/AZ31 interface at rolling temperature of 350°C and reduction rate of 25%. Therefore the A1050/AZ31 interface mainly was ductile fracture, and the average tensile strength of A1050/AZ31 interface reached the maximum (43MPa). When the rolling temperature was 450°C and the reduction rate was 25%, the fracture occurred on the brittle intermetallic compound Al₃Mg₂ layer (thickness 7.68μm) and Al₁₂Mg₁₇ layer (thickness 1.95μm), mainly on Al₃Mg₂ layer, and the average tensile strength of A1050/AZ31 interface reached the minimum (0.61MPa). (paper)