Abstract
The results of database based on the efficiency packed model for metallic glasses. The database contains the atomic radii information as well as elastic properties of the most commonly used alloying elements, permitting composition, packing efficiency and elastic property predictions to be made for binary, ternary and quaternary bulk metallic glasses. Twenty different alloys per system (binary, ternary and quaternary) experimentally reported in the literature were compared with those estimated by the database. Comparison charts and diagrams showed good agreement between the composition predictions and those reported from the experimentally processed metallic glasses. The elastic properties predictions could be used to elaborate Blackman diagrams in order to know, in advance, the intrinsic toughness that the investigated alloys might present. The database is intended for designing bulk metallic glasses. Finally, some quaternary alloys were experimentally produced based on the prediction obtained with the database, showing a glassy phase. The microhardness values obtained experimentally of the Zr57.52Ag10.62Al10.62Co21.24, Zr57.19Al10.7Ni10.7Cu21.41 and Hf60.22Al9.95Cu9.95Ni19.89alloys, are 3.8, 4.0 and 3.6 GPa, respectively. The Young´s modulus calculated using microhardness values (E/Hv = 20) are closed to the values obtained by the mixing rules.
Highlights
Despite new metallic glass systems being continuously investigated and reported, and a broadening of the number of engineering applications for this kind of material, the discovery, development and manufacture of bulk metallic glass (BMG) systems is still a complex and long process
The work presented in this manuscript is based on several theoretical models for metallic glasses in terms of glass formation and elastic properties, and is intended to offer an alternative route to design and obtain BMG by estimating the system with glass forming ability (GFA) from a structural perspective and predict its theoretical elemental elastic properties, from which some indication of plasticity can be obtained
In addition to the above, quaternary alloys were experimentally produced in order to get bulk metallic glasses
Summary
Despite new metallic glass systems being continuously investigated and reported, and a broadening of the number of engineering applications for this kind of material, the discovery, development and manufacture of bulk metallic glass (BMG) systems is still a complex and long process. The dense packing accomplished by structural and chemical atomic ordering below the glass transition temperature brings the BMG-forming liquids energetically and entropically closer to the corresponding crystalline state. These factors lead to slow crystallisation kinetics and consequentially to high glass forming ability (GFA)[12]. The work presented in this manuscript is based on several theoretical models for metallic glasses in terms of glass formation and elastic properties, and is intended to offer an alternative route to design and obtain BMG by estimating the system with GFA from a structural perspective (densest atomic packing) and predict its theoretical elemental elastic properties, from which some indication of plasticity can be obtained. In addition to the above, quaternary alloys were experimentally produced in order to get bulk metallic glasses
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
