The recrystallization behavior of Mo wires doped with various contents of La2O3,which were prepared by powder metallurgy method,was investigated using TEM and SEM in detail.It is shown that the recrystallization tempe...The recrystallization behavior of Mo wires doped with various contents of La2O3,which were prepared by powder metallurgy method,was investigated using TEM and SEM in detail.It is shown that the recrystallization temperature and recrystallized microstructure of Mo-La2O3 wires are strongly dependent on the La2O3 contents.An interlocked large grain structure is formed in Mo-La2O3 wires with contents of 0.2-0.4 wt% La2O3,on the other hand,Mo─La2O3 wires containing less than 0.1 or more than 0.8 wt% La2O3 show equiaxed grain structure.The reason for this is the difference between the longitudinal interparticle spacing and the transverse spacing of La2O3 particles in various Mo-La2O3 wires,which was observed by using TEM.展开更多
The effect of aluminum,potassium and silicon(AKS) content on the high-temperature properties and microstructure of molybdenum powder,sintering product and fabricated wires were studied. The molybdenum powder was produ...The effect of aluminum,potassium and silicon(AKS) content on the high-temperature properties and microstructure of molybdenum powder,sintering product and fabricated wires were studied. The molybdenum powder was produced firstly by reduction of molybdenum oxide which is doped with K2SiO3 and Al(NO3)3·9H2O. Then doped molybdenum powder was cold pressed into cylindrical compact with diameter of 17 mm,and sintered in induction furnace. The microstructure of molybdenum ingots was examined by transmission electron microscopy. The results show found that the doped elements form non-crystalline phase and distribute along the interface of Mo,thus inhibit the grain growth of Mo. Finally,the sintered Mo was drawn into wires with a diameter of 0.70 mm. The formed non-crystalline particles are changed into row of fine particle during the drawing process.展开更多
文摘The recrystallization behavior of Mo wires doped with various contents of La2O3,which were prepared by powder metallurgy method,was investigated using TEM and SEM in detail.It is shown that the recrystallization temperature and recrystallized microstructure of Mo-La2O3 wires are strongly dependent on the La2O3 contents.An interlocked large grain structure is formed in Mo-La2O3 wires with contents of 0.2-0.4 wt% La2O3,on the other hand,Mo─La2O3 wires containing less than 0.1 or more than 0.8 wt% La2O3 show equiaxed grain structure.The reason for this is the difference between the longitudinal interparticle spacing and the transverse spacing of La2O3 particles in various Mo-La2O3 wires,which was observed by using TEM.
基金Project(2006KJA21) supported by the Science and Technology Foundation of Aluminum Corporation of Limited, China
文摘The effect of aluminum,potassium and silicon(AKS) content on the high-temperature properties and microstructure of molybdenum powder,sintering product and fabricated wires were studied. The molybdenum powder was produced firstly by reduction of molybdenum oxide which is doped with K2SiO3 and Al(NO3)3·9H2O. Then doped molybdenum powder was cold pressed into cylindrical compact with diameter of 17 mm,and sintered in induction furnace. The microstructure of molybdenum ingots was examined by transmission electron microscopy. The results show found that the doped elements form non-crystalline phase and distribute along the interface of Mo,thus inhibit the grain growth of Mo. Finally,the sintered Mo was drawn into wires with a diameter of 0.70 mm. The formed non-crystalline particles are changed into row of fine particle during the drawing process.
