Farquhar, L., Livera, E., Snell, R. et al. (5 more authors) (2025) Carbonitride Ssrengthening of Mo5Nb35Ti30V30 refractory high-entropy alloy manufactured by laser powder bed fusion. Metallurgical and Materials Transactions A. ISSN 1073-5623
Abstract
Previous research into refractory high-entropy alloys (RHEAs) often focused on optimizing alloys with solid solution phases by adjusting elemental compositions and refining microstructure. To be suitable for critical structural applications, formation of secondary phases, such as those seen in the microstructures of many superalloys, is an area which is still in the early stages of exploration for RHEAs. In this work, a new Mo5Nb35Ti30V30 RHEA is manufactured via laser powder bed fusion and subsequently heat treated, inducing the formation of a TiCN phase, initially on cell and grain boundaries (GBs) after 1 hour. After prolonged 24-hour heat treatment the TiCN on the GBs coarsens and the cellular substructure is removed. Samples are then compression tested, all showing ductile failure. Due to the strengthening caused by interstitial elements in the body-centered cubic (BCC) matrix phase, recovery of the cellular substructures and micron-scale TiCN on GBs, the 24-hour heat-treated samples showed increased compressive strength and ductility compared to the as-built samples. TiCN largely grows at a 45 deg misorientation angle about the [100] axis in the BCC matrix phase, hence Kernel average misorientation (KAM) maps show dislocation pile up at the phase boundaries and at the high angle grain boundaries in the recovered microstructure. Susceptibility of RHEAs to atmospheric interstitial infiltration is a concern in the RHEA field; however, this work shows that, if controlled, exposure to these elements can result in beneficial dual-phase microstructures, interstitial strengthening and improved material properties as a result.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © The Author(s) 2025. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
Keywords: | Engineering; Materials Engineering |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > School of Mechanical, Aerospace and Civil Engineering The University of Sheffield > Faculty of Engineering (Sheffield) > School of Chemical, Materials and Biological Engineering |
Funding Information: | Funder Grant number Engineering and Physical Sciences Research Council EP/P02470X/1 Engineering and Physical Sciences Research Council EP/P025285/1 Engineering and Physical Sciences Research Council EP/P006566/1 Engineering and Physical Sciences Research Council EP/S019367/1 Engineering and Physical Sciences Research Council EP/R00661X/1 Engineering and Physical Sciences Research Council EP/S022635/1 BOEING DEFENCE UK LIMITED UNSPECIFIED |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 26 Mar 2025 16:33 |
Last Modified: | 26 Mar 2025 16:33 |
Status: | Published online |
Publisher: | Springer Science and Business Media LLC |
Refereed: | Yes |
Identification Number: | 10.1007/s11661-025-07731-6 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:224899 |