机械合金化W-Ni-Fe纳米复合粉的制备及结构研究  

Study on Synthesis and Structure of Mechanically Alloyed W-Ni-Fe Nanocomposite Powders

作　　者：张中武[1] 周敬恩[1] 席生岐[1] 冉广[1] 李鹏亮[1] 张文兴[1] 

机构地区：[1]西安交通大学材料科学与工程学院,陕西西安710049

出　　处：《材料热处理学报》2004年第1期1-4,共4页Transactions of Materials and Heat Treatment

摘　　要：W、Ni、Fe粉末按照 91 16W 6 5 6Ni2 2 6Fe和 95W5Ni的成分配比进行了机械合金化 (MA) ,通过调整球磨转速、球磨时间等工艺参数研究了其对粉末结构的影响。并对机械合金化粉末的物相、合金化特性、晶粒尺寸、点阵畸变及粉末形貌和颗粒度作了测定和分析讨论。机械合金化使晶粒细化并产生孪晶和位错 ,有利于原子扩散形成过饱和固溶体和非晶 ;高的球磨能有利于形成非晶相、晶粒细化和点阵畸变 ,35 0r min球磨 2 0h后晶粒尺寸可达 2 5nm ;输入的球磨能不同 ,粉末粒度的变化路径不同 ,但都会经历长大 ,变小和稳定三个不同阶段。The W-Ni-Fe nanocomposite powders with the composition of 91.16W6.56Ni2.26Fe and 95W5Ni were produced by mechanical alloying. The mechanical alloying process parameters, such as milling speed and milling time, were varied in order to investigate their influence on the microstructural evolution of mechanically alloyed powders. The phases, alloying characteristics, grain size and lattice distortion of these powders were determined and discussed. The results show that mechanical alloying could produce an ultrafine composite powder in which large lattice distortion, supersaturated solid solution, amorphous phase occurred due to the fast diffusion induced by high density of defects, such as twins, dislocations and nanograin boundaries. Higher ball-mill energy is benefit for amorphization, ultrafine grain and lattice distortion, and the grain size could reach to 25 nm by ball milling for 20 h with 350 r/min. Changing routes of powder size and powder morphologies are different with the different inputted ball-mill energy.

关 键 词：W-NI-FE 机械合金化(MA) 纳米复合粉 物性 

分 类 号：TG146.4[一般工业技术—材料科学与工程]