摘要
采用ｘ衍射、ＢＥＴ氮吸附法和ＤＴＡ差热分析方法对球磨后的９０Ｗ－７Ｎｉ－３Ｆｅ（质量百分数）纳米复合粉的组织结构变化、表面特性和热稳定性进行了系统的研究。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、中孔表面和孔径降低。
Systematic investigations were carried out on the structural change, surfacial characteristic and thermal stability of the 90w-7Ni-3Fe(mass%) 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 experimental results show that ball-milling could produce an ultrafine composite powders in which large lattice distortion, supersolidus solution, amorphous phase and solubility extension of W in γ phase were occurred due to the fast diffusion induced by high density of lattice defects and nanograin boundaries. BET results provide a further evidence that milling led the specific surface area of powders, surface of meso pore, pore size to decrease and micro pores to produce.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2001年第3期208-211,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金资助项目(59634120)
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
nanostructural composite
tungsten heavy alloy
