Load partition and microstructural evolution during in situ hot deformation of Ti-6Al-6V-2Sn alloys

David Canelo-Yubero, Guillermo Requena, Federico Sket, Maria Cecilia Poletti, Fernando Warchomicka, John Daniels, Norbert Schell, Andreas Stark

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Two Ti-6Al-6V-2Sn alloys, with globular and lamellar microstructures, are deformed at 750 °C during tensile and compression tests. The lamellar microstructure shows softening and higher peak stress values than the globular microstructure as a consequence of the Hall-Petch effect. In-situ high energy synchrotron diffraction experiments allow characterization of the load partition between α- and β-phases, plastic deformation mechanisms and texture evolution. The α-phase deforms mainly by rotation while the β-phase deforms by misorientation formation, acting merely as load transfer agent. The Taylor factor evolution of the α-phase and the annihilation of dislocations are analyzed qualitatively and quantitatively. The Taylor factor is connected to both the softening observed in the alloy with the lamellar microstructure and the texture development.

Original languageEnglish
Pages (from-to)244-258
Number of pages15
JournalMaterials science and engineering / A
Volume657
DOIs
Publication statusPublished - 7 Mar 2016

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Experimental
  • Basic - Fundamental (Grundlagenforschung)

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