Fracture of convoluted and lamellar α2 + γ TiAl alloys
Fracture toughness tests are conducted at room temperature and 923 K (650 degrees C) on SENB (Single Edge Notched Bend) specimens of three different (alpha(2) + gamma ) TiAl-based alloys. One alloy is a conventional near fully lamellar Ti-45Al-2Mn-2Nb + 0.8%vol TiB2 XD alloy. The second and third have a composition of Ti -46Al-8Ta, with a novel "convoluted" cast microstructure developed for turbine applications and a coarse near fully lamellar microstructure, respectively. The novel alloy displays fracture toughness values of 13 +/- 2 MPa root m at room temperature and 19 MPa root m at 923 K (650 degrees C); these values approach data for lamellar microstructures, known to be optimal for this class of alloy. In particular, shear ligament toughening is observed with a role of retained lamellar colonies in toughening the convoluted microstructure. (C) 2011 Elsevier Ltd. All rights reserved.
Keywords: Titanium aluminides ; based on TiAl ; Fracture toughness ; Microstructure ; Aero-engine components ; Titanium Aluminide Alloys ; Tial-Alloy ; Microcrack Nucleation ; Crack-Propagation ; Dislocation Dynamics ; Grain-Refinement ; Pst Crystals ; Resistance ; Microstructure ; Toughness
Record created on 2012-01-03, modified on 2016-08-09