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The microstructures,tensile properties and compressive creep behaviors of Mg-5%Sn-(0-1.0)%Pb (mass fraction) alloys were studied. The microstructures of the Mg-Sn-Pb alloys consist of dendritic α-Mg and Mg2Sn phase. The addition of Pb can refine the size of Mg-2Sn phase and grain size,reduce the amount of Mg-2Sn phase at grain or inter-dendrite boundaries and change the distribution of Mg-2Sn phase. Pb exists in the Mg-2Sn phase or dissolves in α-Mg matrix. The mechanical properties of the tested alloys at room temperature are improved with the addition of Pb. When the Pb content is over 0.5%,the mechanical properties are decreased gradually. The Mg-5%Sn-0.5%Pb shows the best ultimate tensile strength and elongation,174 MPa and 14.3%,respectively. However,the compressive creep resistance of the Mg-Sn-Pb alloys is much lower than that of the Mg-Sn binary alloy at 175 °C with applied load of 55 MPa,which means that Pb has negative effects on the compressive creep resistance of the as-cast Mg-Sn alloys.
The microstructures of the Mg-Sn-Pb alloys consist of dendritic α-Mg and Mg2Sn phases . The addition of Pb can refine the size of Mg-2Sn phase and grain size, reduce the amount of Mg-2Sn phase at grain or inter-dendrite boundaries and change the distribution of Mg-2Sn phase. Pb exists in the Mg-2Sn The mechanical properties of the tested alloys at room temperature are improved with the addition of Pb. The mechanical properties of the tested alloys at room temperature are improved with the addition of Pb. The Mg-5% Sn- 0.5% Pb shows the best ultimate tensile strength and elongation, 174 MPa and 14.3%, respectively. However, the compressive creep resistance of the Mg-Sn-Pb alloys is much less than that of the Mg-Sn binary alloy at 175 ° C with applied load of 55 MPa, which means that Pb has negative effects on the compressive creep resistance of the as- cast Mg-Sn alloys.