Non-equilibrium arc-melted binary Ti-Fe bulk alloys with ultra-high strength and enhanced ductility

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Abstract

In the present work we report on the formation of the high-strength and ductile hypo-, hyper- and eutectic Ti-Fe arc-melted alloy ingots with the dimensions of about 25-30 mm in diameter and 10-15 mm in height. The structure of the samples studied by X-ray diffractometry and scanning electron microscopy is found to consist of cubic Pm̄3m TiFe and BCC Im̄3m β-Ti supersaturated solid solution phase. The arc-melted Ti65Fe 35 alloy has a dispersed hypereutectic structure consisting of the primary TiFe phase and submicron-size eutectic structure. The arc-melted Ti 65Fe35 alloy ingot sample exhibits excellent mechanical properties: a Young's modulus of 149 GPa, a high mechanical fracture strength of 2.2 GPa, a 0.2 % yield strength of 1.8 GPa and 6.7 % ductility. The hard round-shaped intermetallic TiFe phase and the supersaturated p-Ti solid solution result in a high strength of the Ti65Fe35 alloy which in addition has much higher ductility compared to that of the nanostructured or glassy alloys. The ductile β-Ti solid solution phase enables plastic deformation of the sample. The reasons for the high ductility of the hypereutectic alloy are discussed.

Original languageEnglish
Pages (from-to)49-52
Number of pages4
JournalJournal of Metastable and Nanocrystalline Materials
Volume24-25
DOIs
Publication statusPublished - 2005

Keywords

  • Ductility
  • High strength
  • Intermetallic compound
  • Mechanical properties
  • Ti-based alloys

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Materials Science(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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