Improvement of microstructure, mechanical and corrosion properties of biomedical Ti-Mn alloys by Mo addition

Pedro Fernandes Santos, Mitsuo Niinomi, Huihong Liu, Ken Cho, Masaaki Nakai, Adhitya Trenggono, Sébastien Champagne, Hendra Hermawan, Takayuki Narushima

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

In previous studies, Ti-Mn alloys showed promising performance for biomedical applications, but their elongation required improvement. In this study, Mo was added to Ti-Mn alloys to promote mechanical twinning and improve their ductility. Four alloys for biomedical applications were designed and fabricated by cold crucible levitation melting: Ti-5Mn-3Mo (TMM-53), Ti-5Mn-4Mo (TMM-54), Ti-6Mn-3Mo (TMM-63), and Ti-6Mn-4Mo (TMM-64). The microstructure, mechanical properties, tensile deformation mechanisms, and electrochemical corrosion properties of the alloys were evaluated. Their hardness ranges from 336 to 373 HV. Their Young's modulus ranges from 89 to 100 GPa. Both hardness and Young's modulus tend to decrease with decreasing amount of athermal ω phase, which is caused by increasing alloying elements contents. Mo addition improves the elongation of TMM-53 and TMM-54 by promoting twinning. Conversely, it increases the tensile strength of TMM-63 and TMM-64. Particularly, TMM-54 shows an elongation of 34% with an ultimate tensile strength (UTS) of 935 MPa. TMM-63 shows an elongation of 14% and a UTS of 1220 MPa, associated to the formation of deformation-induced ω phase. Moreover, Mo addition decreases the corrosion rate of the Ti-Mn alloys to a level comparable to that of commercially-pure Ti.

Original languageEnglish
Pages (from-to)414-424
Number of pages11
JournalMaterials and Design
Volume110
DOIs
Publication statusPublished - 2016 Nov 15

Keywords

  • Deformation mechanisms
  • Electrochemical corrosion
  • Mechanical properties
  • Ti-Mn-Mo alloys
  • β phase

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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