【摘要】 在TZM钼合金的基础上掺杂稀土氧化镧,用粉末冶金法生产出掺镧TZM合金。采用SEM、EDS对不同配方稀土钼合金的微观结构进行了分析。结果表明,掺镧可显著降低合金的晶粒尺寸,合金晶粒尺寸随着掺镧量的增加而减小;合金内第二相弥散颗粒不仅存在于晶界,也存在于晶内,可同时强化晶界和晶粒;间隙元素C、O会在晶界的第二相上富集,Ti在合金中会形成粗大的Ti-Mo固溶体,而C会和Mo形成粗大的Mo2C。稀土氧化镧的掺杂能促进TZM合金弥散分布的细小第二相的析出。更多还原

【Abstract】 Based on TZM molybdenum alloy,TZM alloy doped with rare-earth oxide La2O3 was produced by powder metallurgy.Microstructure of the molybdenum alloys with different composition was analyzed by SEM and EDS.Results show that grain size of the La-doped alloys can be significantly fined and the grain size decreases with the increase of doped lanthanum.The second phase particles exist not only at the grain boundary but also in the grain,so they can strengthen both the boundary and the grain simultaneously.Interstitial elements C and O are enriched in the second phase on grain boundary.Ti,C and Mo can form coarse Ti-Mo solid solution and Mo2C,respectively.Rare earth oxide La2O3 doping can promote the precipitation of small dispersed second phase.更多还原