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Abstract
The purification effects of Er addition in chloride flux during smelting on microstructure, tensile properties, and corrosion resistance of as-cast AZ80D magnesium alloy were carried out. The results show that Er addition in the flux can eliminate the MgO inclusions and improve the tensile properties and corrosion resistance of the alloy. Using chloride flux mixed with 8.0 wt% Er, σ b and δ of the as-cast AZ80D magnesium alloy can be improved from 150 MPa and 2.1 % to the maximum value of 230 MPa and 4.8 %, respectively. Meanwhile, the corrosion rate decreases from 1.10 to 0.12 mg·(cm2·d)−1 in 5 wt% NaCl solution. However, with increasing Er content in chloride flux further, φ-(Al7ErMn5) and τ-(Al66.7Mg23.3Er10) phase are formed, and the morphology of γ-(Mg17Al12) phase is modified. The coarse φ-(Al7ErMn5) phase along dendrite boundaries decreases cohesion force between dendrites, which results in the worse of tensile properties.
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