Enhanced work hardening by redistribution of oxygen in (α+β)-type Ti-4Cr-0.2O alloys

Duck Soo Kang, Norimitsu Koga, Masayuki Sakata, Nobuo Nakada, Toshihiro Tsuchiyama, Setsuo Takaki

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Tensile deformation behavior of an (α+β) dual-phase Ti-4%Cr alloy containing 0.2% oxygen was compared to that of a low-oxygen Ti-4%Cr alloy. The effect of oxygen content on work hardening behavior is discussed herein in terms of inhomogeneous deformation, which relates to the strength ratio of the α and β phases. In the low-oxygen Ti-4%Cr alloy, plastic deformation preferentially occurred in the α phase because the hardness of the β phase is significantly higher. On the other hand, in the Ti-4%Cr-0.2%O alloy, not only the α phase but also the β phase deformed plastically during tensile deformation owing to their similar hardness, where oxygen concentrated into the α phase and increased the hardness by solid solution strengthening. As a result of plastic deformation of the β phase, {332}<113>β deformation twins were formed within the β grains and caused a significant work hardening due to twinning-induced plasticity (TWIP). This leads to good ductility of the Ti-4%Cr-0.2%O alloy in spite of its higher strength compared to the Ti-4%Cr alloy.

Original languageEnglish
Pages (from-to)101-107
Number of pages7
JournalMaterials Science and Engineering A
Volume606
DOIs
Publication statusPublished - Jun 12 2014

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work hardening
Strain hardening
Oxygen
oxygen
tensile deformation
hardness
Hardness
plastic deformation
Plastic deformation
Twinning
twinning
high strength
ductility
plastic properties
Plasticity
Ductility
Solid solutions
solid solutions

All Science Journal Classification (ASJC) codes

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

Cite this

Enhanced work hardening by redistribution of oxygen in (α+β)-type Ti-4Cr-0.2O alloys. / Kang, Duck Soo; Koga, Norimitsu; Sakata, Masayuki; Nakada, Nobuo; Tsuchiyama, Toshihiro; Takaki, Setsuo.

In: Materials Science and Engineering A, Vol. 606, 12.06.2014, p. 101-107.

Research output: Contribution to journalArticle

Kang, Duck Soo ; Koga, Norimitsu ; Sakata, Masayuki ; Nakada, Nobuo ; Tsuchiyama, Toshihiro ; Takaki, Setsuo. / Enhanced work hardening by redistribution of oxygen in (α+β)-type Ti-4Cr-0.2O alloys. In: Materials Science and Engineering A. 2014 ; Vol. 606. pp. 101-107.
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abstract = "Tensile deformation behavior of an (α+β) dual-phase Ti-4{\%}Cr alloy containing 0.2{\%} oxygen was compared to that of a low-oxygen Ti-4{\%}Cr alloy. The effect of oxygen content on work hardening behavior is discussed herein in terms of inhomogeneous deformation, which relates to the strength ratio of the α and β phases. In the low-oxygen Ti-4{\%}Cr alloy, plastic deformation preferentially occurred in the α phase because the hardness of the β phase is significantly higher. On the other hand, in the Ti-4{\%}Cr-0.2{\%}O alloy, not only the α phase but also the β phase deformed plastically during tensile deformation owing to their similar hardness, where oxygen concentrated into the α phase and increased the hardness by solid solution strengthening. As a result of plastic deformation of the β phase, {332}<113>β deformation twins were formed within the β grains and caused a significant work hardening due to twinning-induced plasticity (TWIP). This leads to good ductility of the Ti-4{\%}Cr-0.2{\%}O alloy in spite of its higher strength compared to the Ti-4{\%}Cr alloy.",
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AU - Nakada, Nobuo

AU - Tsuchiyama, Toshihiro

AU - Takaki, Setsuo

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N2 - Tensile deformation behavior of an (α+β) dual-phase Ti-4%Cr alloy containing 0.2% oxygen was compared to that of a low-oxygen Ti-4%Cr alloy. The effect of oxygen content on work hardening behavior is discussed herein in terms of inhomogeneous deformation, which relates to the strength ratio of the α and β phases. In the low-oxygen Ti-4%Cr alloy, plastic deformation preferentially occurred in the α phase because the hardness of the β phase is significantly higher. On the other hand, in the Ti-4%Cr-0.2%O alloy, not only the α phase but also the β phase deformed plastically during tensile deformation owing to their similar hardness, where oxygen concentrated into the α phase and increased the hardness by solid solution strengthening. As a result of plastic deformation of the β phase, {332}<113>β deformation twins were formed within the β grains and caused a significant work hardening due to twinning-induced plasticity (TWIP). This leads to good ductility of the Ti-4%Cr-0.2%O alloy in spite of its higher strength compared to the Ti-4%Cr alloy.

AB - Tensile deformation behavior of an (α+β) dual-phase Ti-4%Cr alloy containing 0.2% oxygen was compared to that of a low-oxygen Ti-4%Cr alloy. The effect of oxygen content on work hardening behavior is discussed herein in terms of inhomogeneous deformation, which relates to the strength ratio of the α and β phases. In the low-oxygen Ti-4%Cr alloy, plastic deformation preferentially occurred in the α phase because the hardness of the β phase is significantly higher. On the other hand, in the Ti-4%Cr-0.2%O alloy, not only the α phase but also the β phase deformed plastically during tensile deformation owing to their similar hardness, where oxygen concentrated into the α phase and increased the hardness by solid solution strengthening. As a result of plastic deformation of the β phase, {332}<113>β deformation twins were formed within the β grains and caused a significant work hardening due to twinning-induced plasticity (TWIP). This leads to good ductility of the Ti-4%Cr-0.2%O alloy in spite of its higher strength compared to the Ti-4%Cr alloy.

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