The role of β-titanium ligaments in the deformation of dual phase titanium alloys

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

卷:746

Article

Jun, Tea-Sung^1,2  Maeder, Xavier³  Bhowmik, Ayan^1,5  Guillonneau, Gaylord^3,4  Michler, Johann³  Giuliani, Finn¹  Ben Britton, T.¹ 

[1] Imperial Coll London, Royal Sch Mines, Dept Mat, London SW7 2AZ, England

[2] Incheon Natl Univ, Dept Mech Engn, Incheon 22012, South Korea

[3] EMPA, Swiss Fed Labs Mat Sci & Technol, Lab Mech Mat & Nanostruct, Feuerwerkerstr 39, CH-3602 Thun, Switzerland

[4] Univ Lyon, Ecole Cent Lyon, LTDS UMR CNRS 5513, 36 Ave Guy Collongue, F-69134 Ecully, France

[5] Nanyang Technol Univ, Rolls Royce NTU Corp Lab, Singapore, Singapore

关键词: Micropillar compression;    Micromechanics;    Electron backscatter diffraction (EBSD);    TEM;    Titanium alloys;   

DOI  :  10.1016/j.msea.2019.01.032

来源: Elsevier

【 摘 要 】

Multiphase titanium alloys are critical materials in high value engineering components, for instance in aero engines. Microstructural complexity is exploited through interface engineering during mechanical processing to realise significant improvements in fatigue and fracture resistance and strength. In this work, we explore the role of select interfaces using in-situ micromechanical testing with concurrent observations from high angular resolution electron backscatter diffraction (HR-EBSD). Our results are supported with post mortem transmission electron microscopy (TEM). Using micro-pillar compression, we performed in-depth analysis of the role of select beta-titanium (body centred cubic) ligaments which separate neighbouring alpha-titanium (hexagonal close packed) regions and inhibit the dislocation motion and impact strength during mechanical deformation. These results shed light on the strengthening mechanisms and those that can lead to strain localisation during fatigue and failure.

【 授权许可】

Free