摘要
采用X射线衍射分析,BET氮吸附法和DTA差热分析对球磨后的90W-7Ni-3Fe(质量分数)纳米复合粉的组织结构变化,表面特性和热稳定性系统地进行了研究,XRD和DTA的分析结果表明球磨可以生成纳米复合粉,晶粒内部产生很大的晶格畸变,同时球磨产生的密度和缺陷使原子扩散加快,形成超饱和固溶体、非晶和扩大W在粘结相中的溶解度,BET氮吸附结果证明了球磨使粉末产生微孔,比表面中孔和孔径降低。
Systematic investigations were carried out on the structure change, surface characteristic and thermal stability of the 90W-7Ni-3Fe(wt%) high energy milled powders using a combination of X-ray powder diffraction, Brunauer-Emmett-Teller(BET) nitrogen adsorption technique and differential thermal analysis assited by DTA. The results showed that ball milling could produce an ultrafine composite material in which large lattice distortion, supersolidus solution, amorphous phase and extension of solubility W in Υ phase were occurred due to the fast diffusion induced by high density of lattice defects and nanograin boundaries. BET results provided a further evidence that milling led to the specific surface area, pores, radius decrease and micro pores. induce, a composite powder formation.
出处
《粉末冶金材料科学与工程》
EI
1999年第4期256-261,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金
国家"863"高新技术计划资助
关键词
高能球磨
机械合金化
纳米复合材料
高密度钨合金
high energy ball milling
mechanical alloying
nanostructure composite
tungsten heavy alloy
