Structural, mechanical and oxidation characteristics of siliconized Ti–Al–X (X=Nb, Ta) alloys
Source abstract
Abstract
Abstract In this work, Ti–46.6Al, Ti–45.2Al–7.2Nb and Ti–44.8Al–6.6Ta alloys were siliconized by being buried in Si powder followed by heating (900, 1000 and 1100 °C for 2–12 h). Observation of the silicide formation kinetics showed that at 900 °C, the layers grow linearly with time. Meanwhile, at 1000 and 1100 °C, the growth is suppressed after the first two hours of siliconizing. Structure and composition observations revealed that, regardless of the composition of the substrate, the silicide layers formed at 900 and 1000 °C are composed of sublayers of TiSi 2 and TiSi, elongated-shape TiSi crystals and a titanium-depleted sublayer at the silicide/metal interface. The layer formed at 1100 °C is Ti 5 Si 3 with an external layer of Al 2 O 3 . The obtained silicide layers possessed very high hardness and improved oxidation resistance. This effect was significantly more pronounced in the case of the ternary alloys.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · MXene and MAX Phase Materials · Semiconductor materials and interfaces
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
Show source-provided references
1. Titanium, titanium alloys, and titanium compounds
2. IMPRESS integrated project – an overview paper10.1016/j.msea.2005.09.066 ↗
3. The influence of tantalum on the high temperature characteristics of lamellar gamma+alpha 2 titanium aluminide10.1016/j.msea.2011.07.070 ↗
4. Comparison of Nb- and Ta-effectiveness for improvement of the cyclic oxidation resistance of TiAl-based intermetallics10.1016/j.intermet.2010.11.025 ↗
5. Microstructural refinement in cast TiAl alloys by solid state transformations10.1016/j.scriptamat.2004.12.021 ↗
6. Characterization of pack-borided last-generation TiAl intermetallics10.1016/j.surfcoat.2012.08.034 ↗
7. Influence of siliconizing on the oxidation behavior of a γ-TiAl based alloy10.1016/S0966-9795(02)00193-0 ↗
8. Improving the oxidation resistance of TiAl-based alloy by siliconizing10.1016/S1359-6462(01)00675-3 ↗
9. The deposition of aluminide and silicide coatings on γ-TiAl using the halide-activated pack cementation method10.1007/BF02595625 ↗
10. Oxidation kinetics of the pack siliconized TiAl-based alloy and microstructure evolution of the coating10.1016/j.intermet.2005.11.038 ↗
11. Codeposition of Al and Si to form oxidation-resistant coatings on γ-TiAl by the pack cementation process10.1016/S0254-0584(02)00551-5 ↗
12. Surface protection of titanium by Ti5Si3 silicide layer prepared by combination of vapour phase siliconizing and heat treatment10.1016/j.jallcom.2007.10.020 ↗
13. Liquid-phase aluminizing and siliconizing at the surface of a Ti60 alloy and improvement in oxidation resistance10.1016/j.msea.2006.06.059 ↗
14. Intermetallic protective coatings on titanium10.1016/j.intermet.2005.11.035 ↗
15. A method of heat-treatment of near γ-TiAl to enhance oxidation resistance by the formation of a Ti5Si3 layer10.1016/S0921-5093(04)00868-8 ↗
16. Improvement of high-temperature oxidation resistance of TiAl-based alloy by sol–gel method10.1016/j.jallcom.2007.10.017 ↗
17. Si-modified aluminide coatings deposited on Ti46Al7Nb alloy by slurry method10.1016/j.intermet.2009.04.006 ↗
18. Grain Refinement in Cast Ti–46Al–8Nb AND Ti–46Al–8Ta alloys via massive transformation10.1002/adem.200800159 ↗
19. Microstructures and tensile properties of massively transformed and aged Ti46Al8Nb and Ti46Al8Ta alloys10.1016/j.intermet.2008.09.006 ↗
20. Barin · 1993
21. Improvement of high-temperature oxidation resistance of titanium by silicon
22. Cyclic-oxidation resistance of protective silicide layers on titanium10.1007/s11085-005-4385-2 ↗
23. Review of the effect of alloy composition on the growth rates of scales formed during oxidation of gamma titanium aluminide alloys10.1016/S0921-5093(02)00064-3 ↗
24. Mechanism of isothermal oxidation of the intel-metallic TiAl and of TiAl alloys10.1007/BF00665663 ↗
25. Formation of alumina on Ti–Al alloys10.1016/0036-9748(87)90291-2 ↗