Tensile behavior and cold workability of Ti-Mo alloys

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

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

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
Volume45
Issue number5
DOIs
Publication statusPublished - May 2004

Fingerprint

cold rolling
Cold rolling
tensile tests
molybdenum alloys
Molybdenum alloys
microstructure
Microstructure
titanium alloys
Formability
products
ductility
Titanium alloys
Ductility
hardness
Hardness
fine structure
Oxygen
oxygen
matrices

Keywords

  • 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)
  • Metals and Alloys

Cite this

Tensile behavior and cold workability of Ti-Mo alloys. / Takemoto, Yoshito; Shimizu, Ichiro; Sakakibara, Akira; Hida, Moritaka; Mantani, Yoshikazu.

In: Materials Transactions, Vol. 45, No. 5, 05.2004, p. 1571-1576.

Research output: Contribution to journalArticle

Takemoto, Y, Shimizu, I, Sakakibara, A, Hida, M & Mantani, Y 2004, 'Tensile behavior and cold workability of Ti-Mo alloys', Materials Transactions, vol. 45, no. 5, pp. 1571-1576. https://doi.org/10.2320/matertrans.45.1571
Takemoto, Yoshito ; Shimizu, Ichiro ; Sakakibara, Akira ; Hida, Moritaka ; Mantani, Yoshikazu. / Tensile behavior and cold workability of Ti-Mo alloys. In: Materials Transactions. 2004 ; Vol. 45, No. 5. pp. 1571-1576.
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abstract = "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.",
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AB - 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.

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