Abstract:The structures and properties of the La-doped molybdenum(La-Mo) powder , compact , rods and wires annealed at different temperatures were investigated. The experimental results show that the to exists in the powders in the forms of lanthanum nitrate , lanthana and complex oxides of molylxlenum and lanthanum , whereas the bo exsists in the compacts, reds and annealed wiresin the form of lanthana. Upon annealing at 1600 ℃ , the elongated La₂O₃ in wires breaks up intorows of La₂O₃ particles. The recrystallization temperature of molybdenum wires has been in-creased , and its ductility and the creepresistunt properties have also been improved by addition of lower-content of La₂O₃. Morever , grain structure with large aspect ratio has been formed in theMo wires doped with lower content of La₂O₃. When the La₂O₃ reaches higher content , the La-Mowires show excellent thermionic electron properties and less recrystallised low-temperature embrittlement.

Key words: molytxlenum La microstructure recrystallization strengthening toughening