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Martensitic microstructures and mechanical properties of as-quenched metastable beta-type Ti-Mo alloys

TitleMartensitic microstructures and mechanical properties of as-quenched metastable beta-type Ti-Mo alloys
Publication TypeJournal Article
Year of Publication2016
AuthorsWang, CH, Yang, CD, Liu, M, Li, X, Hu, PF, Russell, AM, Cao, GH
JournalJournal of Materials Science
Date Published07
Type of ArticleArticle
ISBN Number0022-2461
Accession NumberWOS:000375317100029
Keywordselastic-deformation-behavior, fe, Materials Science, modes, nb-zr-ta, nucleation, omega phase-transformation, stability, strengthening mechanisms, tensile properties, titanium-alloys

Microstructures and tensile properties were investigated in metastable beta-type Ti-10Mo, Ti-15Mo, and Ti-20Mo alloys after solution treatment. In addition to beta phase, different martensitic structures with various sizes and morphologies were found in these alloys. In the Ti-10Mo alloy, acicular alpha aEuro(3) plates were uniformly distributed in the beta matrix. Transmission electron microscopy (TEM) revealed {111} alpha aEuro(3)-type twins had formed in alpha aEuro(3) plates, and the orientation relationship between the beta and alpha aEuro(3) is close to (110) beta//(001) alpha aEuro(3), () beta//(110) alpha aEuro(3), and [] beta//[] alpha aEuro(3). In the Ti-15Mo alloy, nanoparticles of athermal omega phase containing {112} beta-type twins were observed in the beta matrix. Smaller omega particles were found in the Ti-20Mo alloy than in the Ti-15Mo alloy. When tensile tested, the Ti-10Mo and Ti-15Mo alloys exhibited large plastic strains of 24 and 29 %, respectively, with ultimate tensile stresses of 756 and 739 MPa. The Ti-20Mo alloy displayed a higher ultimate tensile stress of 792 MPa but much smaller plastic strain (2 %). Although beta phase dominates in all the metastable beta-type Ti-Mo alloys, the nanostructured martensites also play an important role in the mechanical properties of the alloys.

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Alternate JournalJ. Mater. Sci.