Effects of Zinc Insert and Al Content in Mg Alloy on the Bondability in Dissimilar Joints of Steel and Magnesium Alloys
The effects of zinc insert and Al content in Mg alloy on the bondability in steel/Mg alloy joints were evaluated using SEM, EDX, XRD and tensile test. A cold rolled steel plate (SPCC), a zinc coated steel (GI), Mg-3mass% Al alloy (AZ31) and Mg-6mass% Al alloy (AZ61) were used in this study. The bondability of the joints using zinc insert were significantly improved, because Zn-Mg eutectic reaction efficiently removes the oxide films on the Mg alloy. While a thin Fe-Al type interfacial reaction layer was formed discontinuously in GI/AZ31 joint, a Fe-Al and Al-Mg combined interfacial reaction layer was continuously formed in GI/AZ61 joint. These microstructural changes leads to mechanical properties of the joints, that is, the joint strength was improved from 40MPa in GI/AZ31 joint to 70MPa in GI/AZ61 joint.
- 溶接学会論文集 : quarterly journal of the Japan Welding Society
溶接学会論文集 : quarterly journal of the Japan Welding Society 27(2), 183s-186s, 2010-01-20
JAPAN WELDING SOCIETY