【作者】 张秋；

【导师】 杨渭；

【作者基本信息】 中国石油大学 ， 材料物理与化学， 2007， 硕士

【摘要】 机械合金化技术是新型的固态反应技术,由于可以制备非晶、纳米晶、过饱和固溶体等多种亚稳态材料,近年来受到材料研究者的普遍关注。本文采用机械合金化法制备了Fe基纳米晶及非晶磁性材料,并对材料的微观组织进行了分析。同时,对机械合金化法制备的磁性材料的磁性能进行了研究。本文选用Fe元素为基体,以Ni、Si、C为添加元素,采用机械合金化制备新材料的工艺,对制备Fe基纳米晶及非晶磁性材料进行了尝试,并初步研究了球磨时间、球磨气氛等因素对不同成分合金的晶粒尺寸、磁性能的影响,同时,在关于球磨机理方面,也进行了初步的探讨,通过一系列的实验研究,得到以下结论:(1)在一定的球磨条件下,机械合金化可以制得Fe-Ni-Si-C纳米晶及非晶合金材料,球磨机制主要为冷焊破断机制;(2)所制得的合金的组织结构、晶粒尺寸与合金的成分、球磨时间以及球磨气氛有关,氧化是抑制形成单一非晶相的一个重要因素;(3)所制得的合金具备一定的磁性能,其矫顽力高低与合金成分、球磨时间以及球磨气氛有关;(4)材料的矫顽力高低与晶粒尺寸有关。综上所述,机械合金化作为一种新的工艺手段,将会推动新材料领域及相关学科的巨大进步。如果能够克服机械合金化过程中所带来的杂质和应力的影响,可以预见将会有许许多多具有特异功能的新材料问世。更多还原

【Abstract】 Mechanical alloying(MA),which is a new technology of solid state reaction, has attracted much attention of materials researchers recently, because it can synthesize metastable materials such as amorphous phase, nanocrystallines, super-saturated solid solution, etc.Fe based nanocrystalline and amorphous materials had been produced by mechanical alloying in this thesis. The microstructure of the composites had been studied. And the magnetic properties of the composites had also been studied and analyzed.Fe-Ni-Si-C nanocrystalline and amorphous powders were produced by RS in tradition way. In such way, we can only get silky or bandy products. It is very important that we can get amorphous powder of Fe-Ni-Si-C alloy in large range. Fe-Ni-Si-C powders are both important soft magnetic materials. It is found that with the change of time, the grain size of the Fe-Ni-Si-C alloy keeps declining and the magnetic properties of them keep invariability. Under different atmosphere the changes are different. We can get some information about them.(1) Under some ball milling conditions, we can get Fe based nanocrystalline and amorphous materials.(2) The structure and the grain size of the alloys have been changed with the milling time and the atmosphere of the milling system. Oxygenation can prevent the atmosphere structure from producing.(3) The alloys produced by ball milling have obvious magnetic properties and which have changed with the milling time and milling atmosphere.(4)The coercive forces of the alloys have increased with the declining of the grain sizes.更多还原