Si和La元素对Mo丝显微组织与力学性能的影响  

Effect of Si and La additions on the microstructure and mechanical properties of molybdenum wire

作　　者：冯鹏发[1,2] 刘仁智[1] 赵虎[1] 杨秦莉[1] 付静波[1] 孙军[2] 

机构地区：[1]金堆城钼业股份有限公司,西安710077 [2]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《粉末冶金技术》2011年第5期328-333,共6页Powder Metallurgy Technology

基　　金：国家高技术发展计划项目(2008AA031002)

摘　　要：系统研究了La、Si单元掺杂和复合掺杂对钼丝的显微组织和力学性能的影响及其作用机制,优化出具有优异力学性能的Mo-Si-La合金丝的成分为Mo-0.15Si-(0.5～0.8)La。MoSi2与Mo原位反应生成Mo5 Si3和Mo3 Si硬质相,起到良好的晶粒细化作用和弥散强化作用。La2 O3颗粒通过延迟微裂纹的形成和扩散,起到韧化作用。在Mo-Si-La合金中,硅化物颗粒的存在有助于La2O3颗粒的弥散均匀化,促进其韧化效果。The effect and mechanism of the addition of La,Si on the microstructure and mechanical properties of molybdenum wire were explored through the systematic experiments,and the composition of Mo-Si-La alloy wire with excellent mechanical properties was optimized,i.e.,Mo-0.15Si-（0.5~0.8）La.Mo3Si and Mo5Si3 particles,which are produced through the in-situ reaction of MoSi2 and Mo,play excellent effects of grain refinement and dispersion strengthening.La2O3 particles make the formation and spread of micro-cracks delayed.In the Mo-Si-La alloy,the presence of molybdenum silicide particles contributes to the more dispersion uniformity of La2O3 particles,so the latter＇s toughening effects are more significant.

关 键 词：强韧化 LA2O3 MOSI2 钼丝 

分 类 号：TG148[一般工业技术—材料科学与工程]