Fracture of convoluted and lamellar α2 + γ TiAl alloys
Source abstract
Abstract
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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · MXene and MAX Phase Materials · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (45)
Show source-provided references
1. Impress integrated project–an overview paper10.1016/j.msea.2005.09.066 ↗
2. Intermetallics: why is it so difficult to introduce them in gas turbine engines?10.1016/j.intermet.2006.01.064 ↗
3. Centrifugal casting of TiAl exhaust valves10.1016/j.intermet.2007.08.007 ↗
4. Study on compression deformation, damage and fracture behavior of TiAl alloys: part I. Deformation and damage behavior10.1016/j.msea.2010.01.011 ↗
5. Effects of aluminium content and microstructure on fracture-toughness of binary TiAl alloys
6. Effects of dislocation dynamics and microstructure on crack growth mechanisms in two-phase titanium aluminide alloys10.1016/S0966-9795(98)80001-0 ↗
7. Fatigue and fracture behavior of a fine-grained lamellar TiAl alloy10.1007/s11661-997-0084-8 ↗
8. The microstructural dependence of mechanical-properties of Ti–48Al–2Cr–2Nb
9. Relationships of slip morphology, microcracking, and fracture-resistance in a lamellar TiAl-alloy10.1007/BF02652296 ↗
10. Microstructure and deformation of two-phase γ-titanium aluminides10.1016/S0927-796X(97)00018-1 ↗
11. Relationships of fracture toughness and dislocation mobility in intermetallics10.1007/s11661-003-0295-6 ↗
12. A high-toughness γ-titanium aluminide10.1016/0956-7151(92)90425-E ↗
13. The role of mechanical twinning on microcrack nucleation and crack propagation in a near-γ TiAl alloy10.1016/j.intermet.2004.03.015 ↗
14. The effect of grain boundary normal on predicting microcrack nucleation using fracture initiation parameters in duplex TiAl10.1016/j.msea.2006.06.046 ↗
15. Dislocation dynamics and fracture processes in two-phase titanium aluminide alloys10.1016/S0921-5093(97)00412-7 ↗
16. Fracture behavior and toughness of PST crystals of TiAl10.1016/1359-6454(95)00255-3 ↗
17. Fracture and fracture toughness of directionally solidified TiAl-based two-phase alloys
18. Intrinsic and extrinsic fracture resistance in lamellar TiAl alloys10.1016/j.actamat.2004.06.026 ↗
19. Colony boundary resistance to crack propagation in lamellar Ti–46Al10.1016/S1359-6454(02)00559-1 ↗
20. Effects of lamellae spacing and colony size on the fracture resistance of a fully-lamellar TiAl alloy10.1016/0956-7151(94)00278-P ↗
21. Toughening mechanisms in titanium aluminides10.1007/BF02656627 ↗
22. Micromechanics of shear ligament toughening10.1007/BF02669869 ↗
23. Effects of microstructure on the deformation and fracture of γ-TiAl alloys10.1016/0921-5093(94)03271-8 ↗
24. An overview of monolithic titanium aluminides based on Ti3Al and TiAl10.1016/S0254-0584(01)00328-5 ↗
25. Crack propagation behavior in TiAl-Nb single and Bi-PST crystals10.1016/j.intermet.2006.12.004 ↗
26. Mechanical properties of Si- and C-doped directionally solidified TiAl–Nb alloys10.1016/j.intermet.2004.01.004 ↗
27. Deformation and fracture behavior in TiAl alloys under monotonic and cyclic loading conditions
28. The relationship between fracture toughness and microstructure of fully lamellar TiAl alloy10.1007/s10853-006-1382-z ↗
29. Fracture resistance of a binary TiAl alloy10.1007/s11661-000-0054-x ↗
30. Crack growth across colony boundaries in binary lamellar TiAl10.1016/S0921-5093(01)01504-0 ↗
31. Microcrack nucleation and growth in elastic lamellar solids10.1023/A:1007649918661 ↗
32. Crack growth in lamellar titanium aluminide10.1023/A:1012217617235 ↗
33. Fracture in lamellar TiAl simulated with the cohesive model10.1016/j.engfracmech.2006.09.022 ↗
34. Grain refinement in γ-TiAl-based alloys by solid state phase transformations10.1016/j.intermet.2005.11.015 ↗
35. Grain refinement in cast Ti–46Al–8Nb and Ti–46Al–8Ta alloys via massive transformation10.1002/adem.200800159 ↗
36. Formation and stability of near convoluted structure obtained in the Ti–46Al–8Ta alloy via air quenching and ageing10.1002/adem.200900220 ↗
37. Microstructures and tensile properties of massively transformed and aged Ti46Al8Nb and Ti46Al8Ta alloys10.1016/j.intermet.2008.09.006 ↗
38. The formation of grain boundary gamma during cooling of Ti46Al8Nb10.1016/j.intermet.2008.09.012 ↗
39. Nucleation of massive gamma during air cooling of Ti46Al8Ta10.1016/j.intermet.2010.01.006 ↗
40. Microstructural refinement in cast TiAl alloys by solid state transformations10.1016/j.scriptamat.2004.12.021 ↗
41. Dynamic elastic moduli of the titanium aluminides10.1007/BF02661586 ↗
42. Measurement of the effective activation volume in 45XD titanium aluminides by repeated transient tests10.1016/j.msea.2007.10.029 ↗
43. Broek · 1986
44. Fracture toughness of TiAl alloys: a comparison of two gamma-alpha2 structures
45. Barbi · 2010