Deformation induced structural change of quenched ω phase in Ti-20 mass%Mo alloy

Yoshikazu Mantani, Yoshito Takemoto, Moritaka Hida, Akira Sakakibara, Kazuyoshi Takayama, Hidehiro Yasuda

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Tensile testing the Ti-20 mass%Mo alloy quenched from 1223 K was performed at 293 K, 623 K and 723 K to investigate the effects quenched ω phase on the mechanical properties. Nominal stress-strain curves after yielding became horizontal with increasing deformation temperature. When deformed at 293 K the dislocation structure observed by TEM had a feature of planner slip concentrated in a banded area. When deformed at elevated temperatures, on the other hand, wavy dislocations were observed to form a cell structure. The specimen deformed after thinning for TEM foil showed the formation of a band product which consisted a single ω-c$/ variant in the vicinity of the crack tip. In situ tensile test in TEM revealed that ω-IC$/ changed into ω-c$/ as deformation progressed. It is considered from these results that deformation behavior at elevated temperatures approached to that of bcc metals because of the stabilization of the β phase, and that the deformation behavior at room temperature was affected by the band product which consists of a single ω-c$/ variant transformed from ω-IC$/. It is further suggested that ω-c$/ can play an obstructing role to the ductility.

Original languageEnglish
Pages (from-to)934-939
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume64
Issue number10
Publication statusPublished - 2000

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Transmission electron microscopy
transmission electron microscopy
Temperature
crack tips
Tensile testing
Stress-strain curves
products
tensile tests
ductility
Crack tips
Metal foil
temperature
Ductility
foils
slip
Stabilization
stabilization
Metals
mechanical properties
Mechanical properties

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Deformation induced structural change of quenched ω phase in Ti-20 mass%Mo alloy. / Mantani, Yoshikazu; Takemoto, Yoshito; Hida, Moritaka; Sakakibara, Akira; Takayama, Kazuyoshi; Yasuda, Hidehiro.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 64, No. 10, 2000, p. 934-939.

Research output: Contribution to journalArticle

Mantani, Yoshikazu ; Takemoto, Yoshito ; Hida, Moritaka ; Sakakibara, Akira ; Takayama, Kazuyoshi ; Yasuda, Hidehiro. / Deformation induced structural change of quenched ω phase in Ti-20 mass%Mo alloy. In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 2000 ; Vol. 64, No. 10. pp. 934-939.
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