Effect of omega phase on deformation behavior of Ti-7.5Mo-xFe alloys

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Abstract

In an earlier study, it was found that Ti-7.5Mo-1Fe and Ti-7.5Mo-2Fe alloys exhibited markedly different mechanical properties. While Ti-7.5Mo-2Fe alloy exhibited excellent mechanical properties, Ti-7.5Mo-1Fe alloy showed an extremely brittle behavior. The present study is a continual research on these two particular alloys with a focus on the effect of ω phase on the deformation behavior of the alloys. The results indicate that 2Fe alloy exhibited a ductile type fracture surface covered with normal deformation dimples. The fracture surface of 1Fe alloy exhibited a terrace-like morphology with numerous sub-micron-sized dimples. Throughout the entire plastically deformed region of 1Fe alloy, {1 1 2}〈1 1 1〉 type twins were observed, but few twins formed in 2Fe alloy. It is suggested that the numerous, larger-sized ω particles in 1Fe alloy have effectively restricted the slip of dislocations that largely limited plastic deformation capability of the alloy. The less and smaller ω particles could not do the same to 2Fe that led to the observed ductile behavior.

Original languageEnglish
Pages (from-to)191-197
Number of pages7
JournalMaterials Chemistry and Physics
Volume76
Issue number2
DOIs
Publication statusPublished - 2002 Aug 15

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mechanical properties
Mechanical properties
plastic deformation
Plastic deformation
slip

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Effect of omega phase on deformation behavior of Ti-7.5Mo-xFe alloys",
abstract = "In an earlier study, it was found that Ti-7.5Mo-1Fe and Ti-7.5Mo-2Fe alloys exhibited markedly different mechanical properties. While Ti-7.5Mo-2Fe alloy exhibited excellent mechanical properties, Ti-7.5Mo-1Fe alloy showed an extremely brittle behavior. The present study is a continual research on these two particular alloys with a focus on the effect of ω phase on the deformation behavior of the alloys. The results indicate that 2Fe alloy exhibited a ductile type fracture surface covered with normal deformation dimples. The fracture surface of 1Fe alloy exhibited a terrace-like morphology with numerous sub-micron-sized dimples. Throughout the entire plastically deformed region of 1Fe alloy, {1 1 2}〈1 1 1〉 type twins were observed, but few twins formed in 2Fe alloy. It is suggested that the numerous, larger-sized ω particles in 1Fe alloy have effectively restricted the slip of dislocations that largely limited plastic deformation capability of the alloy. The less and smaller ω particles could not do the same to 2Fe that led to the observed ductile behavior.",
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Effect of omega phase on deformation behavior of Ti-7.5Mo-xFe alloys. / Lin, D. J.; Chern, Jiin-Huey; Ju, Chien-Ping.

In: Materials Chemistry and Physics, Vol. 76, No. 2, 15.08.2002, p. 191-197.

Research output: Contribution to journalArticle

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AB - In an earlier study, it was found that Ti-7.5Mo-1Fe and Ti-7.5Mo-2Fe alloys exhibited markedly different mechanical properties. While Ti-7.5Mo-2Fe alloy exhibited excellent mechanical properties, Ti-7.5Mo-1Fe alloy showed an extremely brittle behavior. The present study is a continual research on these two particular alloys with a focus on the effect of ω phase on the deformation behavior of the alloys. The results indicate that 2Fe alloy exhibited a ductile type fracture surface covered with normal deformation dimples. The fracture surface of 1Fe alloy exhibited a terrace-like morphology with numerous sub-micron-sized dimples. Throughout the entire plastically deformed region of 1Fe alloy, {1 1 2}〈1 1 1〉 type twins were observed, but few twins formed in 2Fe alloy. It is suggested that the numerous, larger-sized ω particles in 1Fe alloy have effectively restricted the slip of dislocations that largely limited plastic deformation capability of the alloy. The less and smaller ω particles could not do the same to 2Fe that led to the observed ductile behavior.

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