机械球磨法制备纳米晶Fe73.5Cu1Nb3Si13.5B9的结构研究

AN INVESTIGATION OF NANOCRYSTALLINE Fe73.5Cu1Nb3Si13.5B9 PREPARED BY MECHANICAL GRANDING

    摘要
  • 摘要: 对Fe73.5Cu1Nb3Si13.5B9成分的母合金进行了机械球磨,并对不同时间的球磨样品进行了X射线衍射(XRD)和Mössbauer谱(MS)的测量,结果表明样品难以完全非晶化,形成了无序的αFe-Si固溶体纳米晶,晶粒尺寸在5nm左右,同时共有一部分富集Nb,B元素的界面非晶相。在各种球磨条件下对αFe-Si固溶体中的Si含量进行了计算。
    纳米晶Fe73.5Cu1Nb3Si13.5B9软磁合金近年来受到了广泛的重视1。这种材料通常是由熔融金属急冷制成非晶薄带,然后在晶化温度以上退火制成,晶化以后在非晶基体上均匀析出10-20nm尺寸的αFe-Si固溶体。机械球磨或机械合金化是近些年来发展起来的一种制备亚稳态材料如非晶,纳米晶,准晶等的有效手段,有一定优越性。本文利用机械球磨探讨一种制备纳米晶Fe73.5Cu1Nb3Si13.5B9合金粉末的新途径。

     

    Abstract: Precusor of alloy with normal composition of Fe73.5Cu1Nb3Si13.5B9 has been ball-milled. The unmilled and milled samples for various times have been submitted to the X-ray diffraction and Mössbauer measurement. The results show that the crystalline sample is hard to be amorphizied completely, as a result, a co-existence state with both the nanocrystallites of αFe-Si solid solution, with a grain size of about 5nm, and a interfacial amorphous phase enriched with Nb, B elements has been formed. The Si concentration in the αFe-Si have been calculated.

     

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