Abstract
A composite plate of 1060Al and AZ31B was fabricated by multi-pass friction stir processing (MP-FSP). The microstructure and properties of the interface were investigated. Intermetallic compounds (IMCs) containing Al12Mg17 (γ) and Al3Mg2 (β) were formed in the conversion zone (CZ). The morphology of the microstructure in the CZ changed significantly among different travel speeds. Transmission electron microscopy (TEM) of the CZ revealed that the presence of Al12Mg17 (γ) grains in the CZ and the rectangular shaped Al3Mg2 phase with the dimension about 830nm length and 500nm width was detected. Shear tensile test results indicated that the failure load can reach its maximum by decreasing the travel speeds to 4mm/min. Microhardness measurements indicated that mechanical properties were affected by FSP parameters and mainly depended on the formation of IMCs in the CZ. Fracture morphology studies indicated that the presence of IMCs in the CZ controlled the failure mode. In addition, corrosion test results indicated that the corrosion resistance of the 1060Al/AZ31B clad plate was higher than the multi-pass friction stir processed AZ31B and AZ31B parent material.
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