掺杂方式对Mo-La_2O_3合金断裂韧性及掺杂粒子显微结构的影响  

INFLUENCE OF DOPING WAYS ON FRACTURE TOUGHNESS OF Mo-La_2O_3 ALLOYS AND DOPED PARTICLES' MICROSTRUCTURE

作　　者：罗建海[1] 王林[1] 孙院军[1] 

机构地区：[1]金堆城钼业股份有限公司技术中心,陕西西安710077

出　　处：《中国钼业》2015年第5期54-56,60,共4页China Molybdenum Industry

基　　金：国家"十二五"科技支撑计划项目:钨;钼的增值化利用产业技术开发(项目编号:2012BAE06B02)

摘　　要：分别采用液-固和液-液掺杂方式向钼粉中加入氧化镧,用粉末冶金方法烧结出Mo合金。通过透射电镜和扫描电镜研究了不同掺杂方式制备的Mo-La2O3材料中第二相颗粒的粒度分布、形貌,以及钼合金的断口形貌。试验结果表明,液-液掺杂方法有利于细化、分散La2O3;液液掺杂试样的断裂韧性优于液固掺杂试样。并通过位错塞积理论讨论了La2O3的粒度分布对钼合金性能的影响。Lanthanum oxide was introduced to molybdenum powder by liquid-liquid doping and liquid-solid doping respectively .Mo alloys were prepared by powder metallurgy technology .The size distribution and feature of dopant particles and the fractographs of Mo alloys were investigated by TEM and SEM respectively .The results indicated that liquid-liquid doping method is favorable for refining and dispersing La 2 O3 particles uniformly in matrix .Frac-ture toughness of Mo alloys prepared by liquid-liquid doping showed better results than that of liquid-solid doping . Furthermore, the influence of the size distribution of La 2 O3 on properties of Mo alloys was discussed by dislocation pile-up theory .

关 键 词：掺杂 断裂韧性 显微结构 掺杂粒子 Mo-La2O3合金 

分 类 号：TG146.412[一般工业技术—材料科学与工程]