MICROSTRUCTURES AND PROPERTIES OF MOLYBDENUM WIRES DOPED WITH La
来源期刊：中国有色金属学报(英文版)1994年第3期
论文作者：Zhou Meiling Li Jun Zuo Tieyong
文章页码：57 - 62
Key words：molytxlenum ;La ;microstructure ;recrystallization ;strengthening; toughening
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.
