High‐strength bimodal ultrafine Ti‐based alloys with enhanced ductility. Issue 5 (28th March 2014)

• Record Type: Journal Article
• Authors: Cao, G. H.; Zhou, Y. N.; Liu, N.; Li, X.; Russell, A. M.; Gerthsen, D.
• Is Part Of: Crystal research and technology. Volume 49:Issue 5(2014:May)
• Page Start: 338
• Page End: 344
• Publication Date: 2014-03-28
• Subjects: Crystallography -- Periodicals; 548
• DOI: 10.1002/crat.201400035
• Languages: English
• ISSNs: 0232-1300

Abstract

<abstract abstract-type="graphical" xml:lang="en" id="crat201400035-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Bulk Ti₆₅Fe₃₅ and (Ti₆₅Fe₃₅)_96.15‐xSn_3.85Nb_x (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)_93.15Sn_3.85Nb₃ 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 (β‐Ti+TiFe) matrix. The orientation relationship of β‐Ti with TiFe phases is TiFe (011)[100] ∥ β‐Ti (011)[100]. The improved mechanical properties are attributed to the morphology of the phase constituents and the larger lattice mismatches between β‐Ti and TiFe phases due to the additions of Sn and Nb. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgh59f4gc" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>