Influences of additional alloying elements (V, Ni, Cu, Sn, B) on structure and mechanical properties of high-strength hypereutectic Ti-Fe-Co bulk alloys

Larissa V. Louzguina-Luzgina, Dmitri V. Louzguine-Luzgin, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

High-strength nonequilibrium hypereutectic bulk alloys were obtained recently in the Ti-Fe and Ti-Fe-Co systems by arc-melting. Following these results, the influences of the additional alloying elements (V, Ni, Cu, Sn, B) on high strength hypereutectic Ti-Fe-Co bulk alloys are studied and analyzed in the present work. The structure of the hypereutectic quaternary Ti 67Fe14Co14Sn5, Ti 67Fe14Co14V5, Ti70Fe 17Co7Cu6, Ti70Fe17Co 7Ni6, and Ti69.4Fe14.8Co 14.8B1 alloys obtained in the form of arc-melted ingots of about 20-30 mm diameter and 10-15 mm height was studied by X-ray diffractometry and scanning electron microscopy. The mechanical properties were tested by an Instron-type machine. Ti67Fe14Co 14Sn5 alloy exhibits a high ultimate compressive strength of 1830 MPa and a large plastic strain of 24% which exceeds the ductility values obtained for Ti-Fe and Ti-Fe-Co alloys. The addition of Sn causes formation of a relatively rough eutectic structure which is preferable for the high strength hypereutectic alloys. Rough primary dendrites and eutectic rods of the cP2 intermetallic phase act as efficient barriers for shear strain and cracks propagation while fine eutectic rods of submicron size are quite effortlessly cut by deformation bands and cracks.

Original languageEnglish
Pages (from-to)255-259
Number of pages5
JournalIntermetallics
Volume14
Issue number3
DOIs
Publication statusPublished - 2006 Mar 1

Keywords

  • A. Intermetallics
  • B. Ductility
  • D. Microstructure
  • F. Electron microscopy, scanning
  • F. Mechanical testing

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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