Martensitic {332}〈113〉 twin in β type Ti-Mo alloy

Yoshito Takemoto, Moritaka Hida, Akira Sakakibara

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The formation mechanism of {332}〈113〉 twin, one of the deformation modes in metastable β type titanium alloys, was examined by high resolution transmission electron microscopy (HR-TEM) and simulation. The interface structure of twin resembled to α″ martensite. Peculiar movement of atoms to form {332}〈113〉 twin was explained by the β→α″ process followed by the α″→β twin inverse transformation process. The former process brought about convenient conditions to form {332}〈113〉 twin; the atom displacement direction was parallel to 〈113〉, habit plane agreed with {332}, shear strain was 0.2907 and volume change was 0.4% expansion. The parameters of α″ obtained by calculation were a=0.3050 nm, b=0.4913 nm and c=0.4596 nm. Subsequently α″→β twin inverse transformation generated by a shear strain of 0.0628 results in {332}〈113〉 twin having a shear strain of 0.3535. It was suggested that atom displacement and compressive stress field with the martensitic transformation would yield a single ω variant or many defects in the twin band.

Original languageEnglish
Pages (from-to)1072-1078
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume60
Issue number11
Publication statusPublished - 1996

Fingerprint

shear strain
Shear strain
Atoms
atoms
habits
Martensitic transformations
martensitic transformation
titanium alloys
High resolution transmission electron microscopy
martensite
Compressive stress
Titanium alloys
Martensite
stress distribution
Defects
transmission electron microscopy
expansion
high resolution
defects
simulation

Keywords

  • Coincidence lattice
  • Interface
  • Lattice instability
  • Martensite
  • Phase transformation
  • Simulation
  • Titanium alloy
  • Twin

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Martensitic {332}〈113〉 twin in β type Ti-Mo alloy. / Takemoto, Yoshito; Hida, Moritaka; Sakakibara, Akira.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 60, No. 11, 1996, p. 1072-1078.

Research output: Contribution to journalArticle

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N2 - The formation mechanism of {332}〈113〉 twin, one of the deformation modes in metastable β type titanium alloys, was examined by high resolution transmission electron microscopy (HR-TEM) and simulation. The interface structure of twin resembled to α″ martensite. Peculiar movement of atoms to form {332}〈113〉 twin was explained by the β→α″ process followed by the α″→β twin inverse transformation process. The former process brought about convenient conditions to form {332}〈113〉 twin; the atom displacement direction was parallel to 〈113〉, habit plane agreed with {332}, shear strain was 0.2907 and volume change was 0.4% expansion. The parameters of α″ obtained by calculation were a=0.3050 nm, b=0.4913 nm and c=0.4596 nm. Subsequently α″→β twin inverse transformation generated by a shear strain of 0.0628 results in {332}〈113〉 twin having a shear strain of 0.3535. It was suggested that atom displacement and compressive stress field with the martensitic transformation would yield a single ω variant or many defects in the twin band.

AB - The formation mechanism of {332}〈113〉 twin, one of the deformation modes in metastable β type titanium alloys, was examined by high resolution transmission electron microscopy (HR-TEM) and simulation. The interface structure of twin resembled to α″ martensite. Peculiar movement of atoms to form {332}〈113〉 twin was explained by the β→α″ process followed by the α″→β twin inverse transformation process. The former process brought about convenient conditions to form {332}〈113〉 twin; the atom displacement direction was parallel to 〈113〉, habit plane agreed with {332}, shear strain was 0.2907 and volume change was 0.4% expansion. The parameters of α″ obtained by calculation were a=0.3050 nm, b=0.4913 nm and c=0.4596 nm. Subsequently α″→β twin inverse transformation generated by a shear strain of 0.0628 results in {332}〈113〉 twin having a shear strain of 0.3535. It was suggested that atom displacement and compressive stress field with the martensitic transformation would yield a single ω variant or many defects in the twin band.

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