【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。更多还原

【Abstract】 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.更多还原