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In the present research, the Sb-alloying method was adopted, and the grain re finement and tensile properties of as-cast Mg-10Zn-5Al alloys with varying Sb addition were investigated.The results showed that with the Sb addition, a new phase (Mg3Sb2) of high melting point forms in the alloy beside the α-Mg matrix, τ-Mg32(Al, Zn)49 phase and φ-Al2Mg5Zn2 phase.With an appropriate amount of Sb addition, the morphologies of the secondary phases and the matrix are changed and the grains are refined.When Sb addition is 0.6wt.%, both ambient and high temperature tensile strengths of the alloy reach their maximum.The hardness of the alloy increases with the increasing of Sb addition.With proper addition of Sb, the tensile failure mode of the alloy changes from cleavage fracture to quasi-cleavage fracture, showing good enhancement effect.
In the present research, the Sb-alloying method was adopted, and the grain re-fine and tensile properties of as-cast Mg-10Zn-5Al alloys with varying Sb addition were investigated. The results showed that with the Sb addition, a new phase (Mg3Sb2) of high melting point forms in the alloy beside the α-Mg matrix, τ-Mg32 (Al, Zn) 49 phase and φ-Al2Mg5Zn2phase.With an appropriate amount of Sb addition, the morphologies of the secondary phases and the Both ambient and high temperature tensile strengths of the alloy reach their maximum. hardness of the alloy increases with increasing of Sb addition. With proper addition of Sb , the tensile failure mode of the alloy changes from cleavage fracture to quasi-cleavage fracture, showing good enhancement effect.