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

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:657

Article

Canelo-Yubero, David^1,2  Requena, Guillermo³  Sket, Federico⁴  Poletti, Cecilia¹  Warchomicka, Fernando¹  Daniels, John⁵  Schell, Norbert⁶  Stark, Andreas⁷ 

[1] Graz Univ Technol, Inst Mat Sci & Welding, Kopernikusgasse 24-1, A-8010 Graz, Austria

[2] Vienna Univ Technol, Inst Mat Sci & Technol, Karlspl 13-308, A-1040 Vienna, Austria

[3] German Aerosp Ctr, Inst Mat Res, D-51147 Cologne, Germany

[4] IMDEA Mat Inst, C Erik Kandel 2, Madrid 28906, Spain

[5] UNSW Australia, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[6] DESY, Helmholtz Zentrum Geesthacht Outstn, Struct Res New Mat, Notkestr 85, Hamburg, Germany

[7] Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany

关键词: Titanium alloys;    Synchrotron x-ray diffraction;    Hot deformation;    Load partition;    Plasticity;    Deformation mechanism;   

DOI  :  10.1016/j.msea.2016.01.059

来源: Elsevier

【 摘 要 】

Two Ti-6Al-6V-2Sn alloys, with globular and lamellar microstructures, are deformed at 750 degrees 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-Fetch effect. In-situ high energy synchrotron diffraction experiments allow characterization of the load partition between alpha- and beta-phases, plastic deformation mechanisms and texture evolution. The alpha-phase deforms mainly by rotation while the beta-phase deforms by misorientation formation, acting merely as load transfer agent. The Taylor factor evolution of the alpha-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. (C) 2016 Elsevier B.V. All rights reserved.

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