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Alloying effect on solidification behaviour and grain refinement in Ti45Al2Nb2Ta0.8B and Ti45Al2Nb2Hf0.8B / Jing Li, Spencer Jeffs, Mark Whittaker, Nigel Martin

Intermetallics, Volume: 127, Start page: 106984

Swansea University Authors: Jing Li, Spencer Jeffs, Mark Whittaker

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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 rando...

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Published in: Intermetallics
ISSN: 0966-9795
Published: Elsevier BV 2020
Online Access: Check full text

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.
Keywords: Titanium aluminide, TiAl, Solidification, Microstructure, Grain refinement, Boron
College: College of Engineering
Funders: UKRI, EP/H022309/1, EP/H500383/1
Start Page: 106984