Composition design procedures of Ti-based bulk metallic glasses using the cluster-plus-glue-atom model
Source abstract
Abstract
Abstract It is known that bulk metallic glasses are interpreted by simple composition formulas [cluster](glue atom) 1 or 3 , with the valence electron number per unit formula ( e / u ) being universally 24. In the present work, this cluster-plus-glue-atom approach was explored in great details for the objective of establishing the standard procedures towards designing bulk metallic glasses, via example of Ti-Cu-based alloys. The cluster selection from devitrification phases and the e / u calculation methods were first clarified. Then, step-by-step procedures toward developing alloys with high glass forming abilities were proposed. The cluster formula [Ti-Cu 6 Ti 8 ]Cu 3 , with e / u ≈ 23.6, was taken as the basic composition formula. Upon properly alloying with Zr and Sn, large glass forming abilities up to 5 mm in diameter were experimentally reached at Ti 40 Zr 10 Cu 56.94 Sn 3.06 via copper mold suction casting. Another alloy Ti 45.71 Zr 11.43 Cu 39.29 Sn 3.57 showed a slightly inferior glass forming ability of 4 mm but contained the highest Ti(Zr) content of all the Ti-based BMGs, Ni-, Pd- and Be-free. The thus-obtained bulk metallic glasses generally exhibited high compressive strengths of about 1.8 GPa and nearly zero ductilities, except a Co-alloyed one, [Ti-Cu 5.3 Sn 0.5 Co 0.2 Ti 6.2 Zr 1.8 ]Cu 3 , whose compressive ductility exceeded 6%.
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Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys · Phase-change materials and chalcogenides · Quasicrystal Structures and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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