Effect of the initial grain size and orientation on the formation of deformation twins in Ti-15Mo alloy

Y. D. Im, Young-Kook Lee, H. K. Park, K. H. Song

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This study was conducted to evaluate the effect of the grain size and orientation on the formation of deformation twins in Ti-15Mo alloy. For this material, cold rolling was carried out to achieve a 90% thickness reduction on the samples. In order to recrystallize the severely deformed alloy and to obtain two types of grain sizes, the alloys were then annealed at 900 °C for 1 and 30 min, respectively. After this work, electron backscattered diffraction was introduced to analyze grain boundary character distributions. As a result, the coarsened grains (average size ~154 μm) formed denser deformation twins relative to that of the finer grains (average size ~25 μm), which was attributed to the grain boundary constraint and orientation. These effects led to an enhancement of the strain-hardening constant of the alloy, which in turn resulted in a notable increase in the elongation without any significant decrease in the tensile strength. In this study, we systematically discussed the formation of twins in terms of grain size and Schmid factor.

Original languageEnglish
Pages (from-to)11668-11674
Number of pages7
JournalJournal of Materials Science
Volume52
Issue number19
DOIs
Publication statusPublished - 2017 Oct 1

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Grain boundaries
Cold rolling
Strain hardening
Electron diffraction
Crystal orientation
Elongation
Tensile strength
titanium molybdenum alloy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "This study was conducted to evaluate the effect of the grain size and orientation on the formation of deformation twins in Ti-15Mo alloy. For this material, cold rolling was carried out to achieve a 90{\%} thickness reduction on the samples. In order to recrystallize the severely deformed alloy and to obtain two types of grain sizes, the alloys were then annealed at 900 °C for 1 and 30 min, respectively. After this work, electron backscattered diffraction was introduced to analyze grain boundary character distributions. As a result, the coarsened grains (average size ~154 μm) formed denser deformation twins relative to that of the finer grains (average size ~25 μm), which was attributed to the grain boundary constraint and orientation. These effects led to an enhancement of the strain-hardening constant of the alloy, which in turn resulted in a notable increase in the elongation without any significant decrease in the tensile strength. In this study, we systematically discussed the formation of twins in terms of grain size and Schmid factor.",
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Effect of the initial grain size and orientation on the formation of deformation twins in Ti-15Mo alloy. / Im, Y. D.; Lee, Young-Kook; Park, H. K.; Song, K. H.

In: Journal of Materials Science, Vol. 52, No. 19, 01.10.2017, p. 11668-11674.

Research output: Contribution to journalArticle

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