摘要
采用机械球磨的方法制备W-1%La2O3(质量分数,下同)复合粉体,将粉体在1823K烧结1h制备出La2O3增强钨合金。对材料的显微组织结构和力学性能进行分析,结果表明:显微组织均匀,氧化镧主要以微小的颗粒分布在钨-钨界面上,钨晶粒尺寸约为10μm～15μm;La2O3增强钨合金的抗弯强度值475MPa,在相同密度条件下,相对纯钨烧结体提高了35%。抗弯断口形貌表明,加入氧化镧颗粒后,钨合金的断裂方式发生了变化,由钨晶粒断裂为主转变为穿晶断裂和沿晶断裂的混合,同时分析讨论了氧化镧颗粒对合金组织性能的影响。
La2O3/W composite powders were prepared with mechanical high energy ball milling, and pressed and sintered at 1823 K for 1 h to be a tungsten alloy strengthened with dispersed La2O3. The study results of their microstructure and mechanical properties show that the microstructure of sintered tungsten is very homogeneous with grain size of 10 μm-15 μm and distribution of La2O3 panicles on the tungsten grain bundaries. The flexural strength of the alloy reaches 475 MPa, 35% higher than the pure tungsten of the same density. The morphology of fracture surface shows that the fracture mode of W alloy changes from the W grain fracture to the intergranular and transgranular fracture after La2O3 panicles being added. The influences of La2O3 panicles on the microstructure and properties were discussed.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第5期822-824,共3页
Rare Metal Materials and Engineering
基金
合肥工业大学中青年创新群体基金资助项目(103-037016)
中科院合肥物质研究院合作项目(103-413361)
关键词
钨合金
氧化镧
机械球磨
组织性能
tungsten alloy
La2O3
mechanical milling
microstructure and property
