Refinement of lamellar structures in Ti-Al alloy
Source abstract
Abstract
Abstract The hot deformation behavior and refinement of Al-supersaturated α2-Ti3Al grains of Ti-40 at.% Al alloy were investigated by compression tests in a single α-hcp phase region at a strain rate of 1 s−1. Grains were significantly refined and homogenized by hot compression that produced more than a 50% reduction in the height of cylindrical samples. The grains were refined from 660 μm to 3.56 μm by 70% compression at 1473 K, and high densities of dislocations were introduced. In addition, the lamellar structures formed after subsequent aging of the compressed samples were significantly refined, owing to the refinement of Al-supersaturated α2-Ti3Al grains and the introduction of a high density of dislocations by hot compression. Moreover, the lamellar morphologies were affected by the distribution and density of dislocations in the α2-Ti3Al matrix. Ultra-fine lamellar structures with an average lamellar colony size of 4.1 μm and an average lamellar spacing of 25 nm were formed in the 70% compressed sample after aging at 1073 K for 10 ks In addition, a large number of ultra-fine γ grains were formed along the lamellar colony boundaries.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · MXene and MAX Phase Materials · Energetic Materials and Combustion
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (56)
Show source-provided references
1. Gamma titanium aluminide alloys—an assessment within the competition of aerospace structural materials10.1016/S0921-5093(98)01158-7 ↗
2. Effect of microstructure on fatigue and tensile properties of the gamma TiAl alloy Ti-46.5A1-3.0Nb-2.1Cr-0.2W10.1016/0921-5093(94)03263-7 ↗
3. Blackburn · 1970 · 633
4. Phase equilibria and solidification in Ti-Al alloys10.1016/0001-6160(89)90162-4 ↗
5. The deformation behavior of intermetallic superlattice compounds10.1016/0079-6425(90)90002-Q ↗
6. Microstructural evolution and mechanical properties of a forged gamma titanium aluminide alloy10.1016/0956-7151(92)90411-7 ↗
7. Phase equilibria and transformations in intermediate Titanium-Aluminum alloys10.1016/0956-7151(93)90069-5 ↗
8. Saturation of yield stress and embrittlement in fine lamellar TiAl alloy10.1016/S0921-5093(01)01565-9 ↗
9. Phase transformation mechanisms involved in two-phase TiAl-based alloys—I. lamellar structure formation10.1016/1359-6454(95)00167-4 ↗
10. High-resolution electron microscopy study of lamellar boundaries in Ti-rich TiAl polysynthetically twinned crystals10.1016/0304-3991(91)90206-L ↗
11. Xu · 1995 · 189
12. Structural transformations activated during the formation of the lamellar microstructure of TiAl alloys10.1016/j.intermet.2004.12.009 ↗
13. Phase transformations in TiAl based alloys10.1016/j.actamat.2005.02.025 ↗
14. Nucleation of the lamellar decomposition in a Ti–44Al–4Nb–4Zr alloy10.1016/j.actamat.2003.09.005 ↗
15. Ledge mechanism of primary α2/γ lamellae growing in the supersaturated α2 matrix for γ-TiAl-based (γ+α2) alloy10.1016/S1359-6462(98)00153-5 ↗
16. Evolution of antiphase domain (APD)/lamella mixed microstructure in Ti–39 at%Al single crystals10.1016/j.msea.2007.06.026 ↗
17. Effects of plastic deformation on lamellar structure formation in Ti–39 at.% Al single crystals10.1016/j.actamat.2009.10.027 ↗
18. Nanoplastic deformation on Ti–39 at.% Al single crystals for manipulation of every single γ lamella10.1016/j.actamat.2014.05.031 ↗
19. Control of γ lamella precipitation in Ti–39 at.% Al single crystals by nanogroove-induced dislocation bands10.1016/j.actamat.2015.05.016 ↗
20. Development of ultrafine lamellar structures in two-phase γ-TiAl alloys10.1007/s11661-998-0163-5 ↗
21. Microstructural control and mechanical properties of dual-phase TiAl alloys10.1016/S0966-9795(98)00062-4 ↗
22. The role of grain size and selected microstructural parameters in strengthening fully lamellar TiAl alloys10.1007/s11661-998-0157-3 ↗
23. Effects of lamellar spacing on mechanical properties of fully lamellar Ti–39.4mol%Al alloy10.1016/S0921-5093(01)00926-1 ↗
24. Microstructure and deformation of two-phase γ-titanium aluminides10.1016/S0927-796X(97)00018-1 ↗
25. Diffusion in the Ti-Al system10.1016/S1359-6454(99)00400-0 ↗
26. The significance of acoustic emission during stressing of TiAl-based alloys. Part I: detection of cracking during loading up in tension10.1016/S1359-6454(01)00091-X ↗
27. The significance of acoustic emission during stressing of TiAl-based alloys. Part II: influence of cracks induced by pre-stressing on the fatigue life10.1016/S1359-6454(01)00092-1 ↗
28. Pre-yielding and pre-yield cracking in TiAl-based alloys10.1016/j.intermet.2005.04.016 ↗
29. Corrosion behavior of binary titanium aluminide intermetallics10.5006/1.3292153 ↗
30. Morphology of α2 phase in γ-TiAl-base alloy ingots10.1016/0921-5093(91)90784-K ↗
31. A new experimental technique to investigate the α2/γ interface of lamellar TiAl alloy three dimensionally10.1016/S0966-9795(01)00120-0 ↗
32. Selective dissolution of nanolamellar Ti–41 at.% Al alloy single crystals10.1016/j.actamat.2010.01.016 ↗
33. Submicron lamellar porous structure formed by selective dissolution of Ti-Al alloy10.1016/j.matdes.2016.02.096 ↗
34. Nano-lamellar/nano-tubular hierarchical porous structure produced by selective dissolution and anodization of lamellar Ti-40at.% Al alloy10.1016/j.matlet.2014.11.059 ↗
35. Discontinuous yielding and microstructural evolution of Ti-40 at.% Al alloy compressed in single α-hcp phase region10.1016/j.jallcom.2016.10.080 ↗
36. High temperature dynamic yielding in metastable Ti-6.8 Mo-4.5F-1.5 Al10.1016/S0921-5093(97)00800-9 ↗
37. Deformation twinning in metals and ordered intermetallics-Ti and Ti-aluminides
38. Phase transformation mechanisms involved in two-phase TiAl-based alloys—II. Discontinuous coarsening and massive-type transformation10.1016/1359-6454(95)00168-6 ↗
39. Nucleation kinetics of the α→ γM massive transformation in a Ti-47.5 at.% Al alloy10.1016/S1359-6454(02)00572-4 ↗
40. Variant selection during nucleation and growth of γ-massive phase in TiAl-based intermetallic alloys10.1016/j.actamat.2008.11.012 ↗
41. Porter · 2009 · 263
42. Plastic deformation of single crystals of Ti3Al with D019 structure10.1080/01418619108213939 ↗
43. Marcinkoski · 1963
44. Fourfold dissociation of superlattice dislocations in Ti3Al10.1080/09500839008215052 ↗
45. Denquin · 1995 · 141
46. A quantitative TEM analysis of the lamellar microstructure in TiAl based alloys10.1016/S1359-6454(96)00398-9 ↗
47. Interfacial dislocation mechanism for diffusional phase transformations exhibiting martensitic crystallography: formation of TiAl+Ti3Al lamellae10.1016/S1359-6454(99)00416-4 ↗
48. A numerical model for the description of the lamellar and massive phase transformations in TiAl alloys10.1016/j.intermet.2008.07.008 ↗
49. The influence of temperature and alloying additions on the mechanisms of plastic deformation of Ti3Al10.1080/01418619008235561 ↗
50. Plastic deformation of single crystals of a D019 compound with an off-stoichiometric composition (Ti-36.5 at.% Al) at room temperature10.1080/01418619308225357 ↗
51. Low-temperature deformation of single crystals of a D019 compound with an off-stoichiometric composition (Ti-36.5 at.% Al)10.1080/01418619408242246 ↗
52. Prismatic and basal slip in Ti3Al I. Frictional forces on dislocations10.1080/01418619608242968 ↗
53. Prismatic and basal slip in Ti3Al II. Dislocation interactions and cross-slip processes10.1080/01418619608242969 ↗
54. On the dissociation of prism plane superdislocations in Ti3Al10.1080/09500839508242479 ↗
55. A structural aspect of α(α2)→ lamellar α2 + γ transformation in γ-TiAl10.1081/09500830410001726987 ↗
56. Metastable phase formation during α2(D019) to γ (L10) transformation in as-atomized γ-TiAl alloy powders10.1063/1.1825065 ↗