Influence of Fe and Ag addition on the amorphization and thermal stability of CuTiZrNi powders processed by mechanical alloying

Dariusz Oleszak 1Sylwia Dąbrowska Tadeusz Kulik 1

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

Abstract

Since 1988 it has been demonstrated that metallic glasses can be made in a bulk form by solidifying the melt at relatively low cooling rates. Over the past decade, BMGs have gained considerable attention due to their properties (high yield strength, hardness and elastic strain limit, relatively high fracture toughness, fatigue resistance and corrosion resistance) and potential as new structural materials. Also Cu-based alloys have been reported to show the enhanced glass forming ability, enabling the preparation of bulk alloys by conventional casting methods. Another possibility of fabrication of bulk amorphous alloys is consolidation of amorphous powders obtained by melt atomisation or by mechanical alloying technique.In the present work, the influence of chemical composition (Fe and Ag addition) on the amorphization possibility of CuTiZrNi alloys processed by mechanical alloying of a mixture of pure elemental powder was studied. The thermal stability and crystallization behaviour of the amorphous mechanically alloyed powders was determined. X-ray diffraction and differential scanning calorimetry were employed as the experimental techniques for samples characterization.

 

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Presentation: Oral at E-MRS Fall Meeting 2009, Symposium H, by Dariusz Oleszak
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-22 15:11
Revised:   2009-06-18 13:52