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Study of as-cast Nb-Ru samples

Published online by Cambridge University Press:  20 March 2018

S. Samal  and
L.A. Cornish
S. Samal
Affiliation:
DST-NRF Centre of Excellence in Strong Materials and School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, South Africa. Institute of Physics, Czech Academy of Sciences, Na Slovance 1999/2, 182 21Prague 8, Czech Republic, Czech Republic.
L.A. Cornish*
Affiliation:
DST-NRF Centre of Excellence in Strong Materials and School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, South Africa.
*
*Corresponding Author: [email protected]
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Abstract

The Nb-Ru system is of interest because the ∼NbRu phase has potential for high temperature shape memory alloys. Previous workers have identified the phase transformation variously as involving twinning, of cubic-to-tetragonal and tetragonal–to-orthorhombic (or monoclinic) transformations. As well as the terminal (Nb) and (Ru) solid solutions, two intermetallic phases have been identified: ∼NbRu and ∼NbRu3 / ∼Nb3Ru5 / ∼NbRu2, but the boundaries between the different phases are still not fully established. This investigation looked at six as-cast alloys of different compositions across the Nb-Ru system, which were made from 99.95 % purity Nb and Ru. The samples were made by arc-melting under an argon atmosphere, using titanium as an oxygen-getter. These samples were sectioned and prepared metallographically for optical microscopy, SEM and XRD analyses, the latter using an X’pert database. The phases found were (Nb), (Ru), ∼NbRu and “∼NbRu3”, as expected. Although the samples were mainly homogeneous, there was porosity in the (Ru) phase between the “∼NbRu3” dendrites in the Nb28.5:Ru71.5 at.% sample. The Nb14.2:Ru85.8 at.% sample was mainly single-phase (Ru).

Keywords

phase equilibriaNbscanning electron microscopy (SEM)x-ray diffraction (XRD)
Type
Articles
Information
MRS Advances , Volume 3 , Issue 34-35: African Materials Research Society 2017 , 2018 , pp. 1949 - 1953
Copyright
Copyright © Materials Research Society 2018 

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References

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