Mechanical properties of cerium and a cerium-5 wt% lanthanum alloy by nanoindentation and ultrasonic velocity measurements
Mechanical properties of cerium and a cerium-5 wt% lanthanum alloy by nanoindentation and ultrasonic velocity measurements
This paper describes a study of the mechanical properties of cerium (Ce) and a cerium-5 wt% lanthanum (Ce-5 wt% La) alloy using nanoindentation and ultrasonic velocity measurements. The materials were also characterised using optical microscopy, energy dispersive spectroscopy, Raman spectroscopy and X-ray diffraction. Despite their propensity to oxidise rapidly in air, both unalloyed Ce and the Ce-5 wt% La alloy have been studied safely in an open laboratory. The hardness and elastic modulus values of the Ce-5 wt% La alloy were slightly higher than those of unalloyed Ce. However, the hardness values of both materials were significantly higher than other values reported in the literature; this was attributed to the presence of cerium oxide inclusions in the microstructure. Reasonable agreement was found between the elastic moduli obtained by nanoindentation and ultrasonic velocity measurements. The mean elastic modulus measured by nanoindentation was, on average, 14% higher than that obtained from the ultrasonic velocity measurements. This work has demonstrated that, with care, Ce can be handled in an open laboratory and meaningful mechanical property data obtained that appear to be free of the influence of the surface oxide layer.
cerium, nanoindentation, oxidation, rare earth alloys, X-ray diffraction
294-302
Wheeler, D.W.
d276c145-56e0-48d0-ae37-a84dda92a947
Zekonyte, J.
4a1b52a8-fa37-45d8-88d8-593df2efe662
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
20 August 2013
Wheeler, D.W.
d276c145-56e0-48d0-ae37-a84dda92a947
Zekonyte, J.
4a1b52a8-fa37-45d8-88d8-593df2efe662
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Wheeler, D.W., Zekonyte, J. and Wood, R.J.K.
(2013)
Mechanical properties of cerium and a cerium-5 wt% lanthanum alloy by nanoindentation and ultrasonic velocity measurements.
Materials Science and Engineering: A, 578, .
(doi:10.1016/j.msea.2013.04.083).
Abstract
This paper describes a study of the mechanical properties of cerium (Ce) and a cerium-5 wt% lanthanum (Ce-5 wt% La) alloy using nanoindentation and ultrasonic velocity measurements. The materials were also characterised using optical microscopy, energy dispersive spectroscopy, Raman spectroscopy and X-ray diffraction. Despite their propensity to oxidise rapidly in air, both unalloyed Ce and the Ce-5 wt% La alloy have been studied safely in an open laboratory. The hardness and elastic modulus values of the Ce-5 wt% La alloy were slightly higher than those of unalloyed Ce. However, the hardness values of both materials were significantly higher than other values reported in the literature; this was attributed to the presence of cerium oxide inclusions in the microstructure. Reasonable agreement was found between the elastic moduli obtained by nanoindentation and ultrasonic velocity measurements. The mean elastic modulus measured by nanoindentation was, on average, 14% higher than that obtained from the ultrasonic velocity measurements. This work has demonstrated that, with care, Ce can be handled in an open laboratory and meaningful mechanical property data obtained that appear to be free of the influence of the surface oxide layer.
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Published date: 20 August 2013
Keywords:
cerium, nanoindentation, oxidation, rare earth alloys, X-ray diffraction
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nCATS Group
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Local EPrints ID: 357310
URI: http://eprints.soton.ac.uk/id/eprint/357310
ISSN: 0921-5093
PURE UUID: ca5bca38-63b9-4f38-8108-5256426b4b6d
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Date deposited: 07 Oct 2013 12:33
Last modified: 15 Mar 2024 02:47
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Author:
D.W. Wheeler
Author:
J. Zekonyte
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