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Microstructure and mechanical properties of an ultrafine Ti-Si-Nb alloy

TitleMicrostructure and mechanical properties of an ultrafine Ti-Si-Nb alloy
Publication TypeJournal Article
Year of Publication2015
AuthorsCao, GH, Jian, GY, Liu, N, Zhang, WH, Russell, AM, Gerthsen, D
JournalMaterials Chemistry and Physics
Date Published08
Type of ArticleArticle
ISBN Number0254-0584
Accession NumberWOS:000365361500061
Keywordsalloys, behavior, copper, ductility, Electron microscopy, enhanced plasticity, high-strength, improve, Intermetallics, Mechanical testing, metals, Microstructure, nanocrystalline, tensile ductility, ti5si3

Nb-modified ultrafine Ti-Si eutectic alloy was made by cold crucible levitation melting, tested in compression at room temperature, and characterized by electron microscopy. Compression tests of (Ti86.5Si3.5)(97)Nb-3 specimens measured an ultimate compressive strength of 1180 MPa and a compressive plastic strain of 12%, both of which are higher than in eutectic Ti86.5Si13.5 alloy. Electron microscopy showed that the Ti Si Nb alloy had a bimodal microstructure with micrometer-scale primary alpha-Ti dendrites distributed in an ultrafine eutectic (alpha-Ti Ti5Si3) matrix. The enhanced ductility is attributed to the morphology of the phase constituents and to the larger lattice mismatches between alpha-Ti and Ti5Si3 phases caused by the NU addition. The crystallographic orientation relationship of Ti5Si3 with alpha-Ti is (1 (1) over bar 00)[(1) over bar(1) over bar 26] Ti5Si3(1) over bar1 (01T1)[5143] alpha-Ti. (C) 2015 Elsevier B.V. All rights reserved.

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