Improvement in mechanical strength of low-cost β-type Ti-Mn alloys fabricated by metal injection molding through cold rolling

Ken Cho, Mitsuo Niinomi, Masaaki Nakai, Huihong Liu, Pedro F. Santos, Yoshinori Itoh, Masahiko Ikeda, Mohamed Abdel Hady Gepreel, Takayuki Narushima

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

In order to develop new low-cost and high-strength β-type titanium alloys, a Ti-13Mn was fabricated by metal injection molding. For improving its tensile strength, Ti-13Mn was subjected to cold-rolling at reduction ratios of 60% and 90%, respectively. The solutionized Ti-13Mn has pores and titanium carbide (Ti carbide) precipitates and consists of a β phase and an athermal ω phase. The porosity of the alloy decreases from 6.1% to 0.01% after cold-rolling at a reduction ratio of 90%. Moreover, during cold-rolling, the Ti carbides are fragmented and a deformation-induced ω phase is formed. The ultimate tensile strength, 0.2% proof stress, Vickers hardness, and Young's modulus of Ti-13Mn increase from 888 MPa to 1852 MPa, from 827 MPa to 1823 MPa, from 279 Hv to 461 Hv, and from 96 GPa to 108 GPa, respectively, after cold-rolling at a reduction ratio of 90%. On the other hand, the elongations of both the solutionized and cold rolled Ti-13Mn are less than 2%. Although the elongation of Ti-13Mn is less than 2%, the tensile strength of the cold rolled Ti-13Mn is extremely high compared with that of existing titanium alloys. This large-improvement in the tensile strength of the cold rolled Ti-13Mn is attributed to the increase in the dislocation density, decrease in grain size, decrease in porosity, and formation of a deformation-induced ω phase.

Original languageEnglish
Pages (from-to)272-283
Number of pages12
JournalJournal of Alloys and Compounds
Volume664
DOIs
Publication statusPublished - 2016 Apr 15

Keywords

  • Cold rolling
  • Mechanical properties
  • Metal injection molding
  • β-type titanium alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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