摘要
Abstract
Mg-Bi binary alloys are prepared by squeezing casting and extrusion deformation, and their microstructures and mechanical properties under as-cast and as-extruded conditions are investigated by optical microscopy (OM), tension test at room temperature, X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS).The results show that the elongation of as-cast Mg-Bi alloy reduces and the ultimate tensile strength increases gradually with the increase of Bi content, while the content of Bi reaches up to 10wt.%, the ultimate tensile strength of alloy starts to reduce.After extrusion at 450 ℃ for 3 h with extrusion ratio 12.76, the ultimate tensile strength and the elongation of Mg-Bi alloy increase gradually with the increase of Bi content, when the content of Bi is up to 12wt.%, it's ultimate tensile strength is 219.68 MPa, the elongation is 13.43%.The mechanical properties of as-extruded Mg-Bi alloys depend on grain refinement and the strengthening of Mg3Bi2 phase.When the content of Bi is up to 12wt.%, the mechanical properties of alloy reduce due to the formation of many coarse Mg3Bi2 phases.关键词
Mg-Bi合金/挤压铸造/热挤压/显微组织/力学性能Key words
Mg-Bi alloy/ squeezing casting/ hot extrusion/ microstructure/ mechanical properties分类
矿业与冶金
