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 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.展开更多
基金Project(03GG009-007-4) supported by the Key Program of Science and Technology Bureau of Sichuan Province, China
文摘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.