In situ observations of lattice expansion and transformation rates of α and β phases in Ti-6Al-4V

J. W. Elmer, Todd Palmer, S. S. Babu, E. D. Specht

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

In situ X-ray diffraction experiments using synchrotron radiation were performed on Ti-6Al-4V samples to directly observe the α → β phase transformation during heating. These experiments were conducted at the Advanced Photon Source (APS) using a 30 keV synchrotron X-ray beam to monitor changes in the α and β phases as a function of heating time under different heating rates. The results were compared to computational thermodynamic predictions of the phase fractions versus temperature, providing information about the kinetics of the α → β transformation in Ti-6Al-4V. The measured transformation rates were shown to be consistent with a diffusion-controlled growth mechanism, whereby diffusion of V in the β-Ti phase controls the rate. Based on the X-ray diffraction data, real time measurements of the α and β phase lattice parameters were made. Dramatic differences were observed in the changes of the lattice parameters of the two phases during the transformation. These changes are believed to be due to the partitioning of V and its strong effect on the lattice parameter of the β phase. An unexpected contraction of the lattice parameter of the β phase was further observed during heating in the temperature range between 500 and 600 °C. The origin of this contraction is most likely related to the annealing of residual stresses created by the different thermal expansion behaviors of the two phases.

Original languageEnglish (US)
Pages (from-to)104-113
Number of pages10
JournalMaterials Science and Engineering A
Volume391
Issue number1-2
DOIs
StatePublished - Jan 25 2005

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Lattice constants
lattice parameters
heating
expansion
Heating
contraction
X ray diffraction
Phase control
phase control
x rays
Synchrotron radiation
Time measurement
Heating rate
Synchrotrons
diffraction
residual stress
Thermal expansion
phase transformations
thermal expansion
Residual stresses

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

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abstract = "In situ X-ray diffraction experiments using synchrotron radiation were performed on Ti-6Al-4V samples to directly observe the α → β phase transformation during heating. These experiments were conducted at the Advanced Photon Source (APS) using a 30 keV synchrotron X-ray beam to monitor changes in the α and β phases as a function of heating time under different heating rates. The results were compared to computational thermodynamic predictions of the phase fractions versus temperature, providing information about the kinetics of the α → β transformation in Ti-6Al-4V. The measured transformation rates were shown to be consistent with a diffusion-controlled growth mechanism, whereby diffusion of V in the β-Ti phase controls the rate. Based on the X-ray diffraction data, real time measurements of the α and β phase lattice parameters were made. Dramatic differences were observed in the changes of the lattice parameters of the two phases during the transformation. These changes are believed to be due to the partitioning of V and its strong effect on the lattice parameter of the β phase. An unexpected contraction of the lattice parameter of the β phase was further observed during heating in the temperature range between 500 and 600 °C. The origin of this contraction is most likely related to the annealing of residual stresses created by the different thermal expansion behaviors of the two phases.",
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In situ observations of lattice expansion and transformation rates of α and β phases in Ti-6Al-4V. / Elmer, J. W.; Palmer, Todd; Babu, S. S.; Specht, E. D.

In: Materials Science and Engineering A, Vol. 391, No. 1-2, 25.01.2005, p. 104-113.

Research output: Contribution to journalArticle

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