Investigation of High Temperature Ductility Losses in Alpha-Beta Titanium Alloys
COLORADO SCHOOL OF MINES GOLDEN CENTER FOR WELDING RESEARCH
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Under certain conditions, alpha-beta titanium alloys can show severely reduced high-temperature ductility. These conditions consist of loading in tension during cooling from a thermal excursion to above the beta transus. A model for this behavior, which relates the ductility loss to the volumetric incompatibility between the beta and alpha lattices during the beta to alpha transformation, has been previously proposed. This model was developed and investigated as part of an overall investigation of the ductility loss with respect to several metallurgical variables. It was found that the high- temperature ductility loss is ubiquitous in alpha-beta titanium alloys, but could not be directly related to lattice incompatibility. It was instead found that the ductility loss resulted from gross localized deformation within a particular microstructural component, lamellar Widmanstatten colonies.
- Properties of Metals and Alloys