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Influence of yttrium and gadolinium additions on thermal and structural behavior of Cu-Zr bulk metallic glasses

I. V. STASI1,2,* , G. NEDELCU1, C. GHEORGHIEŞ1, N. MATTERN2, J. ECKERT2

Affiliation

  1. Faculty of Mechanic, Dunarea de Jos University, Galaţi, R-800008, Romania
  2. Leibnitz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, Dresden, D-01069, Germany

Abstract

Interest in finding binary alloys that can form bulk metallic glasses (BMGs) has stimulated recent work on the Cu-Zr system, which is know to show glass formation over a wide composition range. The thermal and structural behaviour of rapidly quenched Cu-Zr alloys were analyzed. The ribbons of Cu50Zr50-xMex (Me=Y,Gd; x=5,10,15,20,25) were produced by Melt Spinning method and investigated by using X-ray diffraction, differential scanning calorimetry, scanning electron microscopy and transmission electron microscopy techniques. The characterization of Cu-Zr alloys using DSC related that the reforming activity was strongly correlated with the endothermic heat during the glass state of alloys. Furthermore, the Y or Gd content in Cu-Zr alloys affected the endothermic heat. DSC analyses have confirmed the existence of glass transition, followed by supercooled liquid region in all the composition, in one or two steps. X-ray diffraction patterns of the ribbons before DSC showed that some are amorphous and other partial amorphous. X-ray diffraction patterns recorded for the ribbons heated up to 973 K in DSC using a rate of 20 K min-1 under a flow of purified argon showed that the samples crystallized. SEM and TEM demonstrated that the microstructural evolution depends on the amount of Y or Gd. The precipitating phases were determined by SEM, TEM and XRD. Finally, crystallization processes of the samples were summarized. In the future the study will be focus to interpret all obtained dates. Therefore, these types of BMGs are very promising for the further development of Cu-Zr-based alloys as engineering materials..

Keywords

Bulk metallic glasses, Cu-Zr alloys, Y,Gd addition, XRD, DSC, TEM, SEM.

Submitted at: Sept. 1, 2008
Accepted at: Nov. 11, 2008

Citation

I. V. STASI, G. NEDELCU, C. GHEORGHIEŞ, N. MATTERN, J. ECKERT, Influence of yttrium and gadolinium additions on thermal and structural behavior of Cu-Zr bulk metallic glasses, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 11, pp. 2963-2968 (2008)