Microstructure Evolution of Gas-Atomized β-Solidifying γ-TiAl Alloy Powder during Subsequent Heat Treatment
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Differences in Microstructures of As-Cast Alloys and Gas-Atomized Powder
3.2. Microstructural Evolution after Subsequent Heat Treatment
4. Conclusions
- The cast material with a relatively low solidification rate demonstrated α2/γ colonies surrounded by the β phase. In contrast, the powder consisted of a small amount of the β phase and predominant massive α2 phases with high chemical disequilibrium owing to the high cooling rate.
- The β phase and massive α2 phases have no specific crystallographic orientation relationship with each other.
- After subsequent heat treatment, there were no distinguishing differences in the cast materials; only the volume fraction of the γ phase was changed. However, ultrafine α2/γ lamellar microstructure emerged from the α2 phase, and β/γ cell microstructures were formed at α2/γ lamellar grain boundaries via cellular reaction.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
- Bewlay, B.P.; Nag, S.; Suzuki, A.; Weimer, M.J. TiAl alloys in commercial aircraft engines. Mater. High Temp. 2016, 33, 549–559. [Google Scholar] [CrossRef]
- Clemens, H.; Wallgram, W.; Kremmer, S.; Güther, V.; Otto, A.; Bartels, A. Design of novel β-solidifying TiAl alloys with adjustable β/B2-phase fraction and excellent hot-workability. Adv. Eng. Mater. 2008, 10, 707–713. [Google Scholar] [CrossRef]
- Kim, S.W.; Hong, J.K.; Na, Y.S.; Yeom, J.T.; Kim, S.E. Development of TiAl alloys with excellent mechanical properties and oxidation resistance. Mater. Des. 2014, 54, 814–819. [Google Scholar] [CrossRef]
- Kim, Y.-W.; Kim, S.-L. Advances in gammalloy materials–processes–application technology: Successes, dilemmas, and future. JOM 2018, 70, 553–560. [Google Scholar] [CrossRef]
- Duan, B.; Yang, Y.; He, S.; Feng, Q.; Mao, L.; Zhang, X.; Jiao, L.; Lu, X.; Chen, G.; Li, C. History and development of γ-TiAl alloys and the effect of alloying elements on their phase transformations. J. Alloys Compd. 2022, 909, 164811. [Google Scholar] [CrossRef]
- Todai, M.; Nakano, T.; Liu, T.; Yasuda, H.Y.; Hagihara, K.; Cho, K.; Ueda, M.; Takeyama, M. Effect of building direction on the microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy additively manufactured by electron beam melting. Addit. Manuf. 2017, 13, 61–70. [Google Scholar] [CrossRef]
- Cho, K.; Kawabata, H.; Hayashi, T.; Yasuda, H.Y.; Nakashima, H.; Takeyama, M.; Nakano, T. Peculiar microstructural evolution and tensile properties of β-containing γ-TiAl alloys fabricated by electron beam melting. Addit. Manuf. 2021, 46, 102091. [Google Scholar] [CrossRef]
- Gao, P.; Huang, W.; Yang, H.; Jing, G.; Liu, Q.; Wang, G.; Wang, Z.; Zeng, X. Cracking behavior and control of β-solidifying Ti-40Al-9V-0.5Y alloy produced by selective laser melting. J. Mater. Sci. Technol. 2020, 39, 144–154. [Google Scholar] [CrossRef]
- Kan, W.; Chen, B.; Jin, C.; Peng, H.; Lin, J. Microstructure and mechanical properties of a high Nb-TiAl alloy fabricated by electron beam melting. Mater. Des. 2018, 160, 611–623. [Google Scholar] [CrossRef]
- Zhang, X.; Mao, B.; Mushongera, L.; Kundin, J.; Liao, Y. Laser Powder bed fusion of titanium aluminides: An investigation on site-specific microstructure evolution mechanism. Mater. Des. 2021, 201, 109501. [Google Scholar] [CrossRef]
- Liu, S.; Zhu, H.; Peng, G.; Yin, J.; Zeng, X. Microstructure prediction of selective laser melting AlSi10Mg using finite element analysis. Mater. Des. 2018, 142, 319–328. [Google Scholar] [CrossRef]
- Wang, H.; Wang, L.; Cui, R.; Wang, B.; Luo, L.; Su, Y. Differences in microstructure and nano-hardness of selective laser melted Inconel 718 single tracks under various melting modes of molten pool. J. Mater. Res. Technol. 2020, 9, 10401–10410. [Google Scholar] [CrossRef]
- Schwaighofer, E.; Clemens, H.; Mayer, S.; Lindemann, J.; Klose, J.; Smarsly, W.; Güther, V. Microstructural design and mechanical properties of a cast and heat-treated Intermetallic multi-phase γ-TiAl based alloy. Intermetallics 2014, 44, 128–140. [Google Scholar] [CrossRef]
- Takeyama, M.; Kobayashi, S. Physical metallurgy for wrought gamma titanium aluminides: Microstructure control through phase transformations. Intermetallics 2005, 13, 993–999. [Google Scholar] [CrossRef]
- Hu, D.; Jiang, H. Martensite in a TiAl alloy quenched from beta phase field. Intermetallics 2015, 56, 87–95. [Google Scholar] [CrossRef]
- Mayer, S.; Petersmann, M.; Fischer, F.D.; Clemens, H.; Waitz, T.; Antretter, T. Experimental and theoretical evidence of displacive martensite in an intermetallic Mo-containing γ-TiAl based alloy. Acta. Mater. 2016, 115, 242–249. [Google Scholar] [CrossRef]
- Martín, A.; Cepeda-Jiménez, C.M.; Pérez-Prado, M.T. Gas atomization of γ-TiAl alloy powder for additive manufacturing. Adv. Eng. Mater. 2020, 22, 1900594. [Google Scholar] [CrossRef]
- Gerling, R.; Clemens, H.; Schimansky, F.P. Powder metallurgical processing of intermetallic gamma titanium aluminides. Adv. Eng. Mater. 2004, 6, 23–38. [Google Scholar] [CrossRef]
- Yang, D.Y.; Guo, S.; Peng, H.X.; Cao, F.Y.; Liu, N.; Sun, J.F. Size dependent phase transformation in atomized TiAl powders. Intermetallics 2015, 61, 72–79. [Google Scholar] [CrossRef]
- Kastenhuber, M.; Klein, T.; Rashkova, B.; Weißensteiner, I.; Clemens, H.; Mayer, S. Phase transformations in a β-solidifying γ-TiAl based alloy during rapid solidification. Intermetallics 2017, 91, 100–109. [Google Scholar] [CrossRef]
- Guyon, J.; Hazotte, A.; Bouzy, E. Evolution of metastable α phase during heating of Ti48Al2Cr2Nb intermetallic alloy. J. Alloys Compd. 2015, 656, 667–675. [Google Scholar] [CrossRef]
- Zhang, X.; Li, C.; Wu, M.; Ye, Z.; Wang, Q.; Gu, J. Atypical pathways for lamellar and twinning transformations in rapidly solidified TiAl alloy. Acta Mater. 2022, 227, 117718. [Google Scholar] [CrossRef]
- Guyon, J.; Hazotte, A.; Wagner, F.; Bouzy, E. Recrystallization of coherent nanolamellar structures in Ti48Al2Cr2Nb intermetallic alloy. Acta Mater. 2016, 103, 672–680. [Google Scholar] [CrossRef]
- Ding, X.; Zhang, L.; He, J.; Zhang, F.; Feng, X.; Nan, H.; Lin, J.; Kim, Y.W. As-cast microstructure characteristics dependent on solidification mode in TiAl-Nb alloys. J. Alloys Compd. 2019, 809, 151862. [Google Scholar] [CrossRef]
- Imayev, R.M.; Imayev, V.M.; Oehring, M.; Appel, F. Alloy design concepts for refined gamma titanium aluminide based alloys. Intermetallics 2007, 15, 451–460. [Google Scholar] [CrossRef]
- Yang, J.; Cao, B.; Wu, Y.; Gao, Z.; Hu, R. Continuous cooling transformation (CCT) behavior of a high Nb-containing TiAl alloy. Materialia 2019, 5, 100169. [Google Scholar] [CrossRef]
- Laipple, D.; Stark, A.; Schimansky, F.P.; Schwebke, B.; Pyczak, F.; Schreyer, A. Microstructure of Ti-45Al-5Nb and Ti-45Al-10Nb powders. Key Eng. Mater. 2016, 704, 214–222. [Google Scholar] [CrossRef]
- Massalski, T.B. Massive transformations revisited. Metall. Mater. Trans. A 2002, 33, 2277–2283. [Google Scholar] [CrossRef]
- Panov, D.O.; Sokolovsky, V.S.; Stepanov, N.D.; Zherebtsov, S.V.; Panin, P.V.; Volokitina, E.I.; Nochovnaya, N.A.; Salishchev, G.A. Effect of interlamellar spacing on strength-ductility combination of β-solidified γ-TiAl based alloy with fully lamellar structure. Mater. Sci. Eng. A 2023, 862, 144458. [Google Scholar] [CrossRef]
- Denquint, A.; Naka, S. Phase transformation mechanisms involved in two-phase TiAl-based alloys-I. lambellar structure formation. Acta Mater. 1996, 44, 343–352. [Google Scholar] [CrossRef]
- Sun, Y.Q. Nanometer-scale, fully lamellar microstructure in anaged TiAl-based alloy. Metall. Mater. Trans. A 1998, 29, 2679–2685. [Google Scholar] [CrossRef]
- Kastenhuber, M.; Rashkova, B.; Clemens, H.; Mayer, S. Effect of microstructural instability on the creep resistance of an advanced intermetallic γ-TiAl based alloy. Intermetallics 2017, 80, 1–9. [Google Scholar] [CrossRef]
- Mitaof, S.; Bendersky, L.A. Morphology and growth kinetics of discontinuous coarsening in fully lamellar Ti-44 Al (at.%) alloy. Acta Mater. 1997, 45, 4475–4489. [Google Scholar] [CrossRef]
- Zheng, G.; Tang, B.; Zhao, S.; Wang, W.Y.; Chen, X.; Zhu, L.; Li, J. Evading the strength-ductility trade-off at room temperature and achieving ultrahigh plasticity at 800 °C in a TiAl alloy. Acta Mater. 2022, 225, 117585. [Google Scholar] [CrossRef]
- Cha, L.; Scheu, C.; Clemens, H.; Chladil, H.F.; Dehm, G.; Gerling, R.; Bartels, A. Nanometer-scaled lamellar microstructures in Ti-45Al-7.5Nb-(0; 0.5)C alloys and their influence on hardness. Intermetallics 2008, 16, 868–875. [Google Scholar] [CrossRef]
- Gokcekaya, O.; Ishimoto, T.; Hibino, S.; Yasutomi, J.; Narushima, T.; Nakano, T. Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy. Acta Mater. 2021, 212, 116876. [Google Scholar] [CrossRef]
- Gokcekaya, O.; Ishimoto, T.; Nishikawa, Y.; Kim, Y.S.; Matsugaki, A.; Ozasa, R.; Weinmann, M.; Schnitter, C.; Stenzel, M.; Kim, H.S.; et al. Novel single crystalline-like non-equiatomic TiZrHfNbTaMo Bio-high entropy alloy (BioHEA) developed by laser powder bed fusion. Mater. Res. Lett. 2023, 11, 274–280. [Google Scholar] [CrossRef]
- Zhang, X.; Li, C.; Zheng, M.; Ye, Z.; Yang, X.; Gu, J. Anisotropic tensile behavior of Ti-47Al-2Cr-2Nb alloy fabricated by direct laser deposition. Addit. Manuf. 2020, 32, 101087. [Google Scholar] [CrossRef]
Constituent | Composition (at.%) | |||
---|---|---|---|---|
Ti | Al | Nb | Cr | |
β | 52.37 ± 0.57 | 37.83 ± 0.73 | 6.87 ± 0.15 | 2.93 ± 0.27 |
α2/γ lamellae | 50.26 ± 0.29 | 43.02 ± 0.29 | 5.52 ± 0.04 | 1.20 ± 0.10 |
γ | 49.68 ± 0.24 | 43.68 ± 0.23 | 5.53 ± 0.08 | 1.11 ± 0.04 |
Constituent | Composition (at.%) | |||
---|---|---|---|---|
Ti | Al | Nb | Cr | |
Dendrite | 50.57 ± 0.57 | 41.93 ± 0.63 | 6.38 ± 0.16 | 1.12 ± 0.10 |
Interdendrite | 48.65 ± 0.20 | 44.86 ± 0.40 | 4.93 ± 0.32 | 1.56 ± 0.15 |
Constituent | Composition (at.%) | |||
---|---|---|---|---|
Ti | Al | Nb | Cr | |
β | 51.75 ± 0.28 | 39.93 ± 0.42 | 6.80 ± 0.21 | 1.52 ± 0.09 |
α2/γ lamellae | 50.77 ± 0.37 | 41.95 ± 0.37 | 6.08 ± 0.08 | 1.20 ± 0.07 |
γ | 50.31 ± 0.21 | 42.78 ± 0.20 | 5.76 ± 0.09 | 1.15 ± 0.10 |
Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content. |
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Share and Cite
Park, S.-H.; Gokcekaya, O.; Ozasa, R.; Cho, K.; Yasuda, H.Y.; Oh, M.-H.; Nakano, T. Microstructure Evolution of Gas-Atomized β-Solidifying γ-TiAl Alloy Powder during Subsequent Heat Treatment. Crystals 2023, 13, 1629. https://doi.org/10.3390/cryst13121629
Park S-H, Gokcekaya O, Ozasa R, Cho K, Yasuda HY, Oh M-H, Nakano T. Microstructure Evolution of Gas-Atomized β-Solidifying γ-TiAl Alloy Powder during Subsequent Heat Treatment. Crystals. 2023; 13(12):1629. https://doi.org/10.3390/cryst13121629
Chicago/Turabian StylePark, Sung-Hyun, Ozkan Gokcekaya, Ryosuke Ozasa, Ken Cho, Hiroyuki Y. Yasuda, Myung-Hoon Oh, and Takayoshi Nakano. 2023. "Microstructure Evolution of Gas-Atomized β-Solidifying γ-TiAl Alloy Powder during Subsequent Heat Treatment" Crystals 13, no. 12: 1629. https://doi.org/10.3390/cryst13121629