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.


Published in:
Intermetallics, 22, 176-188
Year:
2012
Publisher:
Elsevier
ISSN:
0966-9795
Keywords:
Laboratories:




 Record created 2012-01-03, last modified 2018-03-17


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