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Alloying effect on solidification behaviour and grain refinement in Ti45Al2Nb2Ta0.8B and Ti45Al2Nb2Hf0.8B
,
Mark Whittaker ,
Nigel Martin
Intermetallics, Volume: 127, Start page: 106984
Swansea University Authors:
Jing Li, Spencer Jeffs , Mark Whittaker
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DOI (Published version): 10.1016/j.intermet.2020.106984
Abstract
The solidification process of Ti45Al2Nb2Ta0.8B (B4522Ta) and Ti45Al2Nb2Hf0.8B (B4522Hf) Bridgman samples were studied through directional solidification. Boron addition at 0.8 at. % was found to have changed the orientation relationship of peritectic α with β dendrites. The peritectic alpha is rando...
| Published in: | Intermetallics |
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| ISSN: | 0966-9795 |
| Published: |
Elsevier BV
2020
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa55375 |
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| Abstract: |
The solidification process of Ti45Al2Nb2Ta0.8B (B4522Ta) and Ti45Al2Nb2Hf0.8B (B4522Hf) Bridgman samples were studied through directional solidification. Boron addition at 0.8 at. % was found to have changed the orientation relationship of peritectic α with β dendrites. The peritectic alpha is randomly oriented in both B4522Ta and B4522Hf, it was likely to be inoculated by boride precipitates at the β/liquid interfaces during peritectic transformation. The alloying effect of Ta and Hf on the peritectic reaction was similar. Borides precipitated earlier in Ta-containing alloy than that in Hf-containing alloy during solidification. |
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| Keywords: |
Titanium aluminide, TiAl, Solidification, Microstructure, Grain refinement, Boron |
| College: |
Faculty of Science and Engineering |
| Funders: |
UKRI, EP/H022309/1, EP/H500383/1 |
| Start Page: |
106984 |