Tensile behavior and cold workability of Ti-Mo alloys

Yoshito Takemoto, Ichiro Shimizu, Akira Sakakibara, Moritaka Hida, Yoshikazu Mantani

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Three kinds of titanium-molybdenum alloy, Ti-8Mo, Ti-14Mo and Ti-20Mo (mass%), quenched from 1223 K were investigated to clarify the tensile behavior and the cold workability using tensile test and conical cup test. In the quenched state Ti-14Mo showed the superior workability. Ti-20Mo has poor ductility in tensile test, but has relatively good formability in conical cup test. Both Ti-8Mo and Ti-14Mo became brittle through a cold rolling of 50% reduction in thickness; however Ti-20Mo did not change in workability by the cold rolling at all. Hardness remarkably increased with rolling reduction in Ti-8Mo and Ti-14Mo, but was almost constant in Ti-20Mo, especially with Ti-20Mo containing high oxygen. Microstructure of Ti-8Mo and Ti-14Mo rolled until seventy-odd percentage exhibited very fine structure and changed to α' + β and β structure, respectively. On the other hand Ti-20Mo hardly changed in microstructure by a cold rolling besides the formation of some band-like products. The product was composed of single variant of commensurate ω-phase, whereas the matrix contained four variants of incommensurate ω-phase. It was suggested that the peculiar deformation mechanism of Ti-20Mo was concerned with stress induced transformation of the ω-phase.

Original languageEnglish
Pages (from-to)1571-1576
Number of pages6
JournalMaterials Transactions
Issue number5
Publication statusPublished - May 2004


  • Cold rolling
  • Conical cup test
  • Omega phase
  • Stress induced martensite
  • Titanium-molybdenum alloy
  • Variant
  • Work hardening
  • Young 's modulus

ASJC Scopus subject areas

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


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