In-situ synthesis of titanium aluminides by direct metal deposition

Gasper, A.N.D.; Catchpole-Smith, S.; Clare, Adam T.

Abstract

This study explores the capabilities of methods for in-situ synthesis of titanium aluminides using the Direct Metal Deposition process. This allows for the functional grading of components which will be required for next generation aerospace components. The feasibility of three techniques are explored here; firstly, a new process of powder preparation for Additive Manufacturing, satelliting, in which a larger parent powder is coated with a smaller powder fraction. Here, Al parent particles are satellited with fine TiO2 to produce an intermetallic matrix composite with Al2O3 particulates. The satelliting procedure is shown to increase capability and mixing of in situ synthesis. Secondly, combined wire and single powder feeding is explored through the use of Ti wire and Al powder to create Ti-50Al (at%). Finally, a combination of wire and loose mixed powders is explored to produce the commercially deployed Ti-48Al-2Cr-2Nb (at%) alloy. The simultaneous wire and powder delivery is designed to overcome issues encountered when processing with single powder or wire feedstocks, whilst allowing for on-the-fly changes in elemental composition required for functional grading. Characterisation of the deposits produced, through OM, SEM, and EDX, reveal the influence of key processing parameters and provides a meaningful basis for comparison between the techniques. Results show that it is possible to produce ?2+? twophase microstructures consistent with previous studies which have relied upon more expensive and harder to obtain pre-alloyed feedstocks. This represents a move forward in manufacturability for an emergent process type.

Citation

Gasper, A., Catchpole-Smith, S., & Clare, A. T. (2017). In-situ synthesis of titanium aluminides by direct metal deposition. Journal of Materials Processing Technology, 239, 230-239. https://doi.org/10.1016/j.jmatprotec.2016.08.031

• Journal Article Type: Article
• Acceptance Date: Aug 26, 2016
• Online Publication Date: Aug 28, 2016
• Publication Date: Jan 1, 2017
• Deposit Date: Sep 1, 2016
• Publicly Available Date: Sep 1, 2016
• Journal: Journal of Materials Processing Technology
• Print ISSN: 0924-0136
• Electronic ISSN: 0924-0136
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 239
• Pages: 230-239
• DOI: https://doi.org/10.1016/j.jmatprotec.2016.08.031
• Keywords: titanium aluminides; laser; deposition; functional grading; additive manufacturing; AM
• Public URL: https://nottingham-repository.worktribe.com/output/830670
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0924013616303077
• Additional Information: This article is maintained by: Elsevier; Article Title: In-situ synthesis of titanium aluminides by direct metal deposition; Journal Title: Journal of Materials Processing Technology; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jmatprotec.2016.08.031; Content Type: article; Copyright: © 2016 The Authors. Published by Elsevier B.V.