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Gleiter及其合作者首先用气体冷凝法合成了纳米晶材料.最近卢柯等人又发展了从非晶态合金制备纳米材料的晶化法.由于纳米晶材料中的高密度的界面组元具有既无长程序又无短程序的类气态结构,可以预期这种新材料会有不同于晶态或非晶态材料的许多优越性能.因而,近年来纳米晶材料的制备及其结构与性能的研究引起了人们的极大兴趣.本文报道制备纳米晶材料的一种新方法,即由非晶态合金经高密度脉冲电流处理使之晶化为纳米材料的方法.与上述的晶化法相比,这种方法不需高温退火处理,而是通过调整脉冲电流参数来控制晶体的成核与长大以形成纳米晶.且由脉冲电流的焦耳热所产生的试样温升远低于非晶合金的晶化温度.
Gleiter and his collaborators first synthesized nanocrystalline materials by gas condensation, and recently Luke et al. Have also developed a crystallization process for the preparation of nanomaterials from amorphous alloys.As the high density of interface components in nanocrystalline materials has It is expected that this novel material will have many superior properties that are different from crystalline or amorphous materials, and therefore, the preparation of nanocrystalline materials and their structure and properties in recent years Research has aroused great interest.This paper reports a new method for the preparation of nanocrystalline materials, that is, amorphous alloy by high-density pulse current processing to crystallize into nanomaterials method.Compared with the crystallization method , This method does not need high-temperature annealing treatment, but by adjusting the pulse current parameters to control the nucleation and growth of the crystal to form nanocrystals and Joule heat generated by pulse current sample temperature is much lower than the amorphous Alloy crystallization temperature.