Amorphous Ni59Zr20Ti16M5 (M = Cu, Ag) alloys obtained by melt spinning and mechanical alloying

Dariusz Oleszak ,  Elżbieta Zbrzeźniak ,  Tadeusz Kulik 

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

Abstract

Nowadays Ni-based bulk metallic glasses (BMG) are considered as potential engineering materials due to their good mechanical properties (high strength, relatively low Young’s modulus and large elastic limit). Several Ni-based alloys have been reported to show the enhanced glass forming ability (GFA), enabling the preparation of BMG by Cu-mould injection casting. Another possibility of fabrication of amorphous powders is mechanical alloying (MA) method.

The main purpose of this work was to produce amorphous Ni59Zr20Ti16M5 (M = Cu, Ag) alloys by mechanical alloying of a mixture of the powders of pure crystalline elements. The studied alloys exhibit high GFA, however, the compositional ranges of amorphisation for MA and rapid quenching are usually different. Then, the thermal stability of all investigated amorphous alloys were studied and compared.

X-ray diffraction (XRD) and differential scanning calorimetry (DSC) were employed as the experimental techniques for samples characterization, both melt spun ribbons and MA powders at different stages of processing.

 

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Presentation: Poster 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 14:58
Revised:   2009-06-08 12:21