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High-strength bimodal ultrafine Ti-based alloys with enhanced ductility

TitleHigh-strength bimodal ultrafine Ti-based alloys with enhanced ductility
Publication TypeJournal Article
Year of Publication2014
AuthorsCao, GH, Zhou, YN, Liu, N, Li, X, Russell, AM, Gerthsen, D
JournalCrystal Research and Technology
Date Published05
Type of ArticleArticle
ISBN Number1521-4079
Accession NumberWOS:000335519000009
Keywordsbulk alloys, Electron microscopy, eutectic growth, hypereutectics, improve, lamellar, Mechanical properties, metals, Microstructure, nanocrystalline, nanostructure-dendrite composite, plasticity, sn, tensile ductility, Ti-based alloys

Bulk Ti65Fe35 and (Ti65Fe35)(96.15-x)Sn3.85Nbx (x = 0, 3, 5 and 7 at.%) alloys were prepared by cold crucible levitation melting, and tested in compression at room temperature. The Sn and Nb modified hypereutectic Ti-Fe alloys exhibited improved mechanical properties under compression. (Ti65Fe35)(93.15)Sn3.85Nb3 alloy displayed an ultimate compressive strength of 2.7 GPa and a compressive plastic strain of 15%. Electron microscope observations revealed Ti-Fe(Sn,Nb) alloys having a bimodal microstructure with micrometer-scale primary TiFe dendrites distributed in an ultrafine eutectic (-Ti+TiFe) matrix. The orientation relationship of -Ti with TiFe phases is TiFe (011)[100] vertical bar -Ti (011)[100]. The improved mechanical properties are attributed to the morphology of the phase constituents and the larger lattice mismatches between -Ti and TiFe phases due to the additions of Sn and Nb.

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