Bulk nanostructured Al-Mm-Ni-(Fe,Co) alloys produced by high-pressure hot compaction of amorphous powders

Hristo Dimitrov 1Jerzy Latuch 1Tadeusz Kulik 1Petr Kubecka 2Peter Svec 2

1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
2. Slovak Academy of Sciences, Institute of Physics, Dúbravská cesta 9, Bratislava 84511, Slovakia (Slovak Rep.)

Abstract

Amorphous and nanocrystalline ribbons can be obtained in quaternary Al-RE-TM1-TM2 systems (RE - rare earth metal, TM1 and TM2 are transition metals). Replacement of RE by Mischmetal (Mm) reduces the cost of the material, as Mm is cheaper than pure rare earth elements. Bulk nanostructured Al-Mm-Ni-(Fe,Co) alloys were produced by ball-milling of amorphous ribbons followed by high-pressure (7.7 GPa) compaction at elevated temperatures. Amorphous ribbons of Al87Mm5Ni5(Fe,Co)3 alloys were produced by melt-spinning technique. Nanocrystallization took place not during additional annealing, but during short-time heating at temperatures close to the onset crystallisation temperature during pressing. X-ray diffractometry and differential scanning calorimetry were used for characterisation of the crystallization process and its products.
Mechanical properties of nanostructured compacted samples, represented by their microhardness, were higher than those of amorphous ribbons.

 

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

Submitted: 2003-05-27 16:32
Revised:   2009-06-08 12:55