Abstract

MELLE, Ana Karla et al. Consolidation of the Cu₄₆Zr₄₂Al₇Y₅ amorphous ribbons and powder alloy by hot extrusion. Mat. Res. [online]. 2012, vol.15, n.5, pp. 728-738.  Epub Aug 09, 2012. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392012005000095.

The amorphous Cu₄₆Zr₄₂Al₇Y₅ alloy presents large supercooled liquid region (ΔT_X = 100 K), with a viscosity of about 10⁶ N.s/m² where the material can flow as a liquid, making it possible an easy deformation in this temperature region. The aim of this work was to analyze processing routes to produce bulks of metallic glasses. Two kinds of materials were used: amorphous powders and ribbons, both were consolidated by hot extrusion in temperatures inside the range between T_g and T_x, with a ram speed of 1 mm/min and extrusion ratio of 3 : 1. Analysis of X-Ray Diffratometry (XRD), Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM), revealed that the proposed consolidation routes were effective to produce large bulks of amorphous materials, even with the strong decreasing of ΔT_X observed after deformation by milling and during extrusion.

Keywords : amorphous copper alloys; hot extrusion; metallic glass.