Crystallographic variant selection in Ti–6Al–4V

Transformation textures in the two-phase alloy Ti–6Al–4V have been studied. Samples were heated into the fully β phase condition and then slow cooled to allow diffusional transformation to α. This produced a microstructure of grain boundary α encircling colonies of Widmanstätten α. Electron backscat...

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Bibliographic Details
Published in:Acta materialia 2004-10, Vol.52 (17), p.5215-5224
Main Authors: Stanford, N., Bate, P.S.
Format: Article
Language:English
Subjects:
ALUMINIUM ALLOYS
BACKSCATTERING
Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
Cross-disciplinary physics: materials science
rheology
CRYSTALLOGRAPHY
EBSD
ELECTRON DIFFRACTION
Exact sciences and technology
GRAIN BOUNDARIES
MATERIALS SCIENCE
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase transformation
PHASE TRANSFORMATIONS
Physics
TEXTURE
Titanium
TITANIUM ALLOYS
VANADIUM ALLOYS
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Summary:Transformation textures in the two-phase alloy Ti–6Al–4V have been studied. Samples were heated into the fully β phase condition and then slow cooled to allow diffusional transformation to α. This produced a microstructure of grain boundary α encircling colonies of Widmanstätten α. Electron backscattered diffraction (EBSD) texture measurements showed that the α texture was markedly sharper than that calculated on a basis of equal variant probability, indicating that significant variant selection was occurring during diffusional transformation. Investigation of the α variants produced across prior β grain boundaries has shown that the selection of variants during transformation is highly dependant on the crystallography of those boundaries. The effect of this crystallographic variant selection on the transformation texture has been modelled.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2004.07.034