掺杂钼丝的组织和性能研究材料科学专业论文.docxVIP

重庆大学硕士学位论文 重庆大学硕士学位论文 英文摘要 ABSTRACT For a long time,the study on molybdenum wire doped谢廿l K A1，Si and molybdenum wire doped with rare earth oxide has drawn extensive attention．By now, the research has been mature on enhancing the reorystallization temperature and mechanics performance of molybdenum wire in order to prolong its life span and enlarge its employ boundary by doping method．Some of the doped molybdenum wire has been manufactured．However，molybdenum wire multi—doped耐m K Al，Si and rare earth oxide has not been studied yet．In order to如gther enhance the recrystallizafion temperature of toolybdenum wire and improve its microstructure and properties，molybdenum wire doped witll＆AI，Si；molyc『denum wire doped with rare earth oxide and toolybdenum wire multi—doped with K A1，Si and rare earth oxide are investigated．The mechanism ofdoped toolybdenum wire is analyzed and proved． m thjs article,molybdenum wire multi—doped with La203 and K A1，Si， molybdenum wire doped埘th K，A1，Si and toolybdenum wire doped with La203 or Y203 are analyzed by DSC，Hot-draw,SEM，Optical Microscope，Micro-hardness， X—Ray and TEM．It is found that multi—doped toolybdenum wire is better at elevating the recrystallization temperature and improving the micro--structure and mechanic properties after recrystallization than molybdenum wire doped with K，AI，Si．The grains ofmutti—doped moIybdenum wire are still long and narrow after heated at 1 873K， Moreover,the falling rate of its microhardness is minished．Molybdenum wire doped with La203 is better at enhancing mechanic properties and microstmcmre than molybdenum wire doped with Y203．Furthermore，La203 particles are easier to diffuse tO the grains boundary than Y203 particles under high temperature． The fruit of this research has been successfully employed in Zigong 764 manufactory．A series of doped tool【ybdenum wire has been manufactured．The rate of eligibl