Microstructure, tensile properties and compressive creep behaviors of Mg-(1.65–11.52) wt.% Sn-2 wt.% Nd alloys were studied in this paper. The microstructure of the as-cast Mg-Sn-Nd alloys consisted of dendritic α-M...Microstructure, tensile properties and compressive creep behaviors of Mg-(1.65–11.52) wt.% Sn-2 wt.% Nd alloys were studied in this paper. The microstructure of the as-cast Mg-Sn-Nd alloys consisted of dendritic α-Mg, Mg2Sn and Mg-Sn-Nd ternary phase containing rare earth element. The highest ultimate tensile strength of 140 MPa and percentage elongation after fracture of 9.7%, were achieved with a composition of Mg-8.23 wt.% Sn-2 wt.% Nd. The compressive creep resistance of Mg-8.23 wt.%Sn-2 wt.% Nd alloy w...展开更多
The microstructure and mechanical properties of as-cast and extruded Mg-6Zn-1Mn-4Sn-xNd （x=0, 0.5, 1.0, 1.5） alloys were investigated by means of optical microscopy （OM）, X-ray diffraction （XRD）, scanning electr...The microstructure and mechanical properties of as-cast and extruded Mg-6Zn-1Mn-4Sn-xNd （x=0, 0.5, 1.0, 1.5） alloys were investigated by means of optical microscopy （OM）, X-ray diffraction （XRD）, scanning electron microscopy （SEM） and tensile test. The results showed that the dendrites sizes of these alloys were decreased by the addition of Nd. The phase compositions of the as-cast Mg-Zn-Mn-Sn-Nd alloys were dendriticα-Mg, MgZn2, Mg2Sn, T phase and MgSnNd ternary phase. The mechanical proper-ties of the as-extruded alloys were improved due to the refined equiaxed grains and dispersive Mg2Sn and MgSnNd second phases. The comparison of the theoretical yield strength with the experimental yield strength revealed that the yield strength model of the as-extruded alloys should be modified asσys=σMg＋σgb＋σss＋σsp.展开更多
基金Project supported by the Science & Technology Bureau of Sichuan Province of China (03GG009-007-4)
文摘Microstructure, tensile properties and compressive creep behaviors of Mg-(1.65–11.52) wt.% Sn-2 wt.% Nd alloys were studied in this paper. The microstructure of the as-cast Mg-Sn-Nd alloys consisted of dendritic α-Mg, Mg2Sn and Mg-Sn-Nd ternary phase containing rare earth element. The highest ultimate tensile strength of 140 MPa and percentage elongation after fracture of 9.7%, were achieved with a composition of Mg-8.23 wt.% Sn-2 wt.% Nd. The compressive creep resistance of Mg-8.23 wt.%Sn-2 wt.% Nd alloy w...
基金Project supported by National Great Theoretic Research Project(2013CB632200)National Sci&Tech Support Project(2011BAE22B01-3)International Cooperation Project(2010DFR50010)
文摘The microstructure and mechanical properties of as-cast and extruded Mg-6Zn-1Mn-4Sn-xNd （x=0, 0.5, 1.0, 1.5） alloys were investigated by means of optical microscopy （OM）, X-ray diffraction （XRD）, scanning electron microscopy （SEM） and tensile test. The results showed that the dendrites sizes of these alloys were decreased by the addition of Nd. The phase compositions of the as-cast Mg-Zn-Mn-Sn-Nd alloys were dendriticα-Mg, MgZn2, Mg2Sn, T phase and MgSnNd ternary phase. The mechanical proper-ties of the as-extruded alloys were improved due to the refined equiaxed grains and dispersive Mg2Sn and MgSnNd second phases. The comparison of the theoretical yield strength with the experimental yield strength revealed that the yield strength model of the as-extruded alloys should be modified asσys=σMg＋σgb＋σss＋σsp.
