Abstract
This study first reports details of a successful arc-melting furnace in the production of bulk metallic glasses (BMGs). Also, the study presents the results of a statistical experiment evaluating critical processing parameters that can increase oxygen concentration and its effects on the glass forming ability (GFA) of two Zr-based BMGs. The experiments on Zr48Cu46.5Al4Nb1.5 BMG composite found that using low arc-current (200 A), short melting time (11 s), positive pressure of argon inert gas trapped in the synthesis chamber, and the absence of prior melting of a Ti-getter results in a lower oxygen contamination in the produced alloy. The second experiment using the Vitreloy 105 BMG alloy proved the previous findings.
Highlights
Most work related to the synthesis of bulk metallic glasses (BMGs) focuses on variables aiming to improve the glass forming ability (GFA) of those alloys, i.e., the base composition[1], the influence of microalloying[2] and the deleterious effect of contaminations as oxygen on Zrbased BMGs3
The set-ups used in BMGs production commonly are the following[8]: fast and powerful heat source, evacuation and back filling the chamber with inert gas, use of melting oxygen Ti-getters inside the chamber, and remelting and flipping of the ingot to ensure homogeneity
The oxygen analyzer in this range of oxygen concentration has an uncertainty around 10 wppm; the remaining uncertainty is due to sample variation
Summary
Most work related to the synthesis of BMGs focuses on variables aiming to improve the GFA of those alloys, i.e., the base composition[1], the influence of microalloying[2] and the deleterious effect of contaminations as oxygen on Zrbased BMGs3 Though necessary, these variables are not enough to achieve the amorphous structure on BMGs, and process variables have a great influence on the structure formation as well. The set-ups used in BMGs production commonly are the following[8]: fast and powerful heat source, evacuation and back filling the chamber with inert gas, use of melting oxygen Ti-getters inside the chamber, and remelting and flipping of the ingot to ensure homogeneity These set-ups successfully produce BMGs, the literature lacks in a consistent investigation of the production variables in the final product
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