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Effects of microalloying with 3d transition metals on glass formation in A1YFe alloys

机译:3d过渡金属微合金化对A1YFe合金玻璃形成的影响

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The effects of microalloying on glass formation and stability were systematically investigated by substituting 0.5 at.% of all 3d transition metals for Al in Al88Y7Fe5 alloys. X-ray diffraction and isothermal differential scanning calorimetry studies indicate that samples containing microadditions of Ti, V, Cr, Mn, Fe and Co were amorphous, while those alloyed with Ni and Cu were not. The onset temperatures for crystallization (devitrification) of the amorphous alloys were increased with microalloying and some showed a supercooled liquid region (Delta T-x = T-x - T-g) of up to 40 degrees C. In addition, microalloying changes the glass structure and the devitrification sequence, as determined by differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM), differential thermal analysis (DTA) and high energy X-ray diffraction. The results presented here suggest that the order induced in the alloy by the transition metal microaddition decreases the atomic mobility in the glass and raises the barrier for the nucleation of alpha-Al, the primary devitrifying phase in most cases. New intermetallic phases also appear with microalloying and vary for different transition metal additions. (c) 2007 Elsevier B.V. All rights reserved.
机译:通过用所有3d过渡金属的0.5 at。%替代Al88Y7Fe5合金中的Al,系统地研究了微合金化对玻璃形成和稳定性的影响。 X射线衍射和等温差示扫描量热法研究表明,含有微量添加的Ti,V,Cr,Mn,Fe和Co的样品是非晶态的,而与Ni和Cu合金化的样品则是非晶态的。微合金化可提高非晶态合金结晶(失透)的起始温度,有些合金的过冷液体区域(Delta Tx = Tx-Tg)最高可达40摄氏度。此外,微合金化可改变玻璃结构和失透顺序由差示扫描量热法(DSC),X射线衍射(XRD),透射电子显微镜(TEM),差热分析(​​DTA)和高能X射线衍射确定。此处给出的结果表明,过渡金属微添加在合金中诱导的顺序降低了玻璃中的原子迁移率,并增加了在大多数情况下主要的失透相α-Al的成核壁垒。新的金属间相也与微合金一起出现,并因添加不同的过渡金属而异。 (c)2007 Elsevier B.V.保留所有权利。

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