Haque, N orcid.org/0000-0002-0271-9209, Cochrane, RF and Mullis, AM (2018) Order-disorder morphologies in rapidly solidified ε/ε′-Ni₅Ge₃ intermetallic. Journal of Alloys and Compounds, 739. pp. 160-163. ISSN 0925-8388
Abstract
Congruently melting, single-phase Ni₅Ge₃ (Tm = 1185 °C) has been rapidly solidified via drop-tube processing wherein powders, with diameters between 850 - 53 μm, are produced. At low cooling rates (850–150 μm diameter particles, 700–7800 K s¯¹) the dominant solidification morphology, revealed after etching, is that of isolated plate & lath microstructure in an otherwise featureless matrix. At higher cooling rates (150–53 μm diameter particles, 7800–42000 K s¯¹) the dominant solidification morphology is that of isolated faceted hexagonal crystallites, again imbedded within a featureless matrix. Selected area diffraction analysis in the TEM reveals the plate & lath, and isolated hexagonal crystallites, are a disordered variant of ε-Ni₅Ge₃, whilst the featureless matrix is the ordered variant of the same compound. Thermal analysis and in situ heating in the TEM indicate a reversible solid-state order-disorder transformation between 470 - 485 °C.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Elsevier B.V. This is an author produced version of a paper published in Journal of Alloys and Compounds. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Rapid solidification, Intermetallic compound, Plate & lath microstructure |
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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Jan 2018 10:15 |
Last Modified: | 26 Dec 2018 01:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jallcom.2017.12.253 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:126669 |