Wang, S. orcid.org/0000-0003-2645-2075, Wang, Y., Zhang, Y. et al. (5 more authors) (2024) Segregation of Mg at TiB2/Al interface mitigating the Zr-poisoning effect. Scripta Materialia, 253. 116310. ISSN 1359-6462
Abstract
Interfacial segregation can modify a substrate's heterogeneous-nucleation potency. In Al alloys inoculated with TiB2, for instance, Zr segregation degrades TiB2’s nucleation potency and causes the loss of grain refinement, a phenomenon termed the Zr-poisoning effect. Here we use grain-refining tests to demonstrate that the addition of Mg can revive grain refinement from the Zr-poisoning effect. Using advanced transmission electron microscopy, we identify the segregation of Mg at the TiB2/Al interface, which causes the disappearance of the poisoning Ti2Zr two-dimensional compound (2DC). In its place, atomic layers of a nature close to the Al solid, which we term “Al-like layers”, develop, rendering the TiB2 potent again to catalyse the nucleation of α-Al. Thereby, Mg-segregation-modified TiB2 particles are reactivated for heterogeneous nucleation of Al grains. Apart from a mitigation of the Zr-poisoning effect, this work may shed further light on the manipulation of heterogeneous nucleation by atomic engineering of the nucleating substrate.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | Crown Copyright © 2024 Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Heterogeneous nucleation, Grain refinement, Zr-poisoning, Elemental segregation, TiB2/Al interface, Electron microscopy |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/W021080/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 07 Aug 2024 10:20 |
Last Modified: | 29 Aug 2024 10:42 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.scriptamat.2024.116310 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:215813 |