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http://bura.brunel.ac.uk/handle/2438/27149| Title: | Solidification behavior and microstructural features of the cast and HIPed N-bearing Ti–48Al–2Cr–2Nb intermetallic alloys |
| Authors: | Ghorbani, HR Kermanpur, A Rezaeian, A Sadeghi, F Siahboumi, AA |
| Keywords: | titanium aluminide;Ti–48Al–2Cr–2Nb;nitrogen;Ti2AlN precipitates;solidification;hot isostatic pressing |
| Issue Date: | 20-Apr-2023 |
| Publisher: | Elsevier |
| Citation: | Ghorbani, H.R. et al. (2023) 'Solidification behavior and microstructural features of the cast and HIPed N-bearing Ti–48Al–2Cr–2Nb intermetallic alloys', Journal of Materials Research and Technology, 24, pp. 5215 - 5234. doi: 10.1016/j.jmrt.2023.04.138. |
| Abstract: | Copyright © 2023 The Author(s). Effect of N addition (0.5, 1, and 2 at. %) on solidification behavior and microstructural features of the cast and hot isostatically pressed (HIPed) Ti–48Al–2Cr–2Nb (4822) intermetallic alloy was investigated. Alloys were fabricated using vacuum arc re-melting followed by HIPing. The results showed that N addition changes the primary β phase dendrites to α phase. The morphological uniformity of the as-cast microstructures was notably increased by N addition. In addition, N addition beyond its solubility limit led to the formation of primary Ti2AlN precipitates located within lamellar colonies. A possible mechanism for nucleation of the Ti2AlN precipitates is proposed. Furthermore, N addition caused much more microstructure stability during HIPing. Although a duplex structure was formed after HIPing in the 4822 alloy, N addition decreased the formation of this structure. Moreover, highly extended network of secondary Ti2AlN precipitates were formed in almost all of (α2+γ) lamellas interfaces in the N-bearing alloys. |
| URI: | https://bura.brunel.ac.uk/handle/2438/27149 |
| DOI: | https://doi.org/10.1016/j.jmrt.2023.04.138 |
| ISSN: | 2238-7854 |
| Other Identifiers: | ORCID iDs: Ahmad Kermanpur https://orcid.org/0000-0001-9339-0180; Fazlollah Sadeghi https://orcid.org/0000-0002-8662-4054 |
| Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
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|---|---|---|---|---|
| FullText.pdf | Copyright © 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/). | 8.93 MB | Adobe PDF | View/Open |
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