Navegando por Autor "Jorge Jr., Alberto Moreira"

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Consolidation of the Cu46Zr42Al7 Y5 amorphous ribbons and powder alloy by hot extrusion
(FapUNIFESP (SciELO), 2012-08-09) Peres, Maurício Mirdhaui; Mellea, Ana Karla; Bolfarini, Claudemiro; Botta, Walter José; Jorge Jr., Alberto Moreira; Kiminami, Claudio Shyinti
The amorphous Cu46Zr42Al7Y5 alloy presents large supercooled liquid region (∆TX = 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 Tg and Tx, 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 ∆TX observed after deformation by milling and during extrusion

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