Influence of La on the crystallisation behaviour of amorphous Al_94−xNi₆La_x (x=4 –7) alloys

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• 作者：M. Wollgarten ; K.L. Sahoo ; J. Haug ; J. Banhart
• 关键词：Amorphous Al-alloys ; Crystallisation ; Scattering methods
• 刊名：Materials Science and Engineering ; A
• 出版年：2007
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：25 March 2007
• 卷：449-451
• 期：Complete
• 页码：1049-1051
• 文件大小：605 K

摘要

Melt spun and subsequently annealed Al-alloys with 6 at.%Ni and 4–7 at.%La were investigated by differential scanning calorimetry, X-ray diffractometry (XRD). XRD reveals that the ribbons are fully amorphous in the as melt spun state. DSC shows that crystallisation proceeds in two stages which are sensitively influenced by the La content. The first stage compromises the formation of either fcc-Al (at low La content) or a bcc phase (at high La concentration) of yet unknown composition. Micro hardness changes significantly during annealing and can be correlated to the different stages of microstructural transformation as observed by XRD.