Effects of Fe on microstructures and mechanical properties of Ti15Nb25Zr(0,2,4,8)Fe alloys prepared by spark plasma sintering

Qiang Li, Xufeng Yuan, Junjie Li, Pan Wang, Masaaki Nakai, Mitsuo Niinomi, Takayoshi Nakano, Akihiko Chiba, Xuyan Liu, Deng Pan

Research output: Contribution to journalArticle

Abstract

Biomedical Ti15Nb25Zr(0, 2, 4, 8)Fe (mol%) alloys are prepared by mixing pure element powders and spark plasma sintering (SPS). Specimens with diameters of 20 mm and thicknesses of 3 mm are obtained by sintering at 1000°C for 10 min followed by cooling in the furnace. Some of the specimens are then heat-treated at 900°C for 1 h followed by water quenching. Zr and Fe are dissolved in Ti; however, segregation of Nb is observed in all of the alloys. The ¢ and ¡AA phases are observed in the as-sintered and heat-treated specimens owing to the insufficient diffusion of the alloying elements. Fe stabilizes the ¢ phase and provides a solution-strengthening effect. With the increase in the Fe content in the as-sintered specimen, the compressive strength and micro-Vickers hardness are improved in the Ti15Nb25Zr(0, 2, 4)Fe alloys and slightly decreased in Ti15Nb25Zr8Fe. The as-sintered Ti15Nb25Zr4Fe alloy exhibits the maximum compressive strength of 1740 MPa. Although the plasticity is decreased by the Fe addition, a fracture strain of approximately 17% is obtained for Ti15Nb25Zr4Fe, indicating a good plasticity. The heat treatment cannot eliminate the segregation of Nb, but can improve the plasticity and slightly increase the strengths of Ti15Nb25Zr(0, 2, 4)Fe. Moreover, the heat-treated Ti15Nb25Zr8Fe exhibits a high strength of approximately 1780 MPa and fracture strain of approximately 19%. Therefore, good comprehensive mechanical properties, including high strengths, high hardnesses, and good plasticities, can be obtained in Fe-added ¢-Ti alloys prepared by SPS and subsequent optional short heat treatment.

Original languageEnglish
Pages (from-to)1763-1768
Number of pages6
JournalMaterials Transactions
Volume60
Issue number9
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Compression
  • Fe
  • Spark plasma sintering
  • Ti alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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