Mullis, AM, Bigg, TD and Adkins, NJ (2015) Structure and phase-composition of Ti-doped gas atomized Raney-type Ni catalyst precursor alloys. Intermetallics, 67. 63 - 68. ISSN 0966-9795
Abstract
Raney-type Ni precursor alloys containing 75 at.% Al and doped with 0, 0.75, 1.5 and 3.0 at.% Ti have been produced by a gas atomization process. The resulting powders have been classified by size fraction with subsequent investigation by powder XRD, SEM and EDX analysis. The undoped powders contain, as expected, the phases Ni2Al3, NiAl3 and an Al-eutectic. The Ti-doped powders contain an additional phase with the TiAl3 DO22 crystal structure. However, quantitative analysis of the XRD results indicate a far greater fraction of the TiAl3 phase is present than could be accounted for by a simple mass balance on Ti. This appears to be a (TixNi1-x)Al3 phase in which higher cooling rates favour small x (low Ti-site occupancy by Ti atoms). SEM and EDX analysis reveal that virtually all the available Ti is contained within the TiAl3 phase, with negligible Ti dissolved in either the Ni2Al3 or NiAl3 phases.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 Elsevier Ltd. All rights reserved. This is an author produced version of a paper published in Intermetallics. Uploaded in accordance with the publisher's self-archiving policy |
Keywords: | Intermetallics (aluminides, silicides); Rapid solidification; Catalysis |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Materials Research (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 Sep 2015 10:15 |
Last Modified: | 25 Oct 2016 17:19 |
Published Version: | http://dx.doi.org/10.1016/j.intermet.2015.07.016 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.intermet.2015.07.016 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:89912 |