Amorphous bulk alloys from Al-Mm-Ni system

Maciej Kowalczyk ,  Tadeusz Kulik ,  Jerzy Latuch 

Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland

Abstract

Recent studies have shown that amorphous alloys from Al-based ternary systems, containing lanthanide metal and late transition metal can be fabricated. Such materials are characterized by good mechanical properties. The most common way of production those alloys is melt spinning, giving a ribbon as a final product. It is possible to replace lanthanide metal by mischmetal. The mischmetal used in this study contains: Ce-50,3 % at., La-43,5 % at, Pr-5,9 % at., Nd-0,3 % at. This is a way to reduce the costs of the raw materials because Mm is several times cheaper than pure lanthanide elements.
This study has two main objectives. First, to check the possibility to replace yttrium in the Al-Y-Ni system alloys by mischmetal, without losing the structure and mechanical properties. Second goal was to produce the bulk amorphous material.
Several alloys from Al-Mm-Ni system, were investigated. The as quenched ribbons were milled to powder and then semi-isostatically compacted at elevated temperature to bulk material. After every step of this investigation, the XRD and DSC measurements were undertaken to distinguish eventual changes occurring during the process (eg. producing the ribbon, milling, compacting). Mechanical properties were characterized by Vickers microhardness.
The results of the studies show the possibility to produce bulk amorphous materials from the above mentioned system in three-step production cycle. The microhardness values are good or even better compared to Al-RE-Ni alloys. Microhardness depends not only on the chemical composition of the alloy but also on the temperature of the compacting process.

 

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium G, by Maciej Kowalczyk
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-26 12:41
Revised:   2009-06-08 12:55