Hardness Characteristics of as-cast Ni-Ru-Zr Alloys
J. Min. Metall. Sect. B-Metall., 57 (2) (2021) 261-270 DOI:10.2298/JMMB200307022C
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Available online 25 February 2021
(Received 07 March 2020; Accepted 25 February 2021)
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Abstract
The Vickers hardness of 21 as-cast Ni-Ru-Zr alloys of different compositions were studied, and nanohardness indentations were done on the individual phases. The results were used to explain the brittleness by assessing the proportions of the phases, and their morphologies. The compound hardness varied between 704 – 1289 HV, with ~ZrRu2 being the hardest phase, and ~Zr2Ni7 being the least hard phase. The sample hardness was 300 – 1015 HV. Most of the samples were brittle, although there were regions of toughness around Ni36:Ru13:Zr51 and Ni20:Ru5:Zr75 (at.%). No alloy was identified to have potential good mechanical properties.
Keywords: Hardness; Ni-Ru-Zr; Alloys; Ternary; As-cast
Correspondence Address:
L. Chipise,
a University of the Witwatersrand, School of Chemical and Metallurgical Engineering
and the DST-NRF Centre of Excellence in Strong Materials, Johannesburg, South Africa;
d University of Botswana, Mechanical Engineering Department, Gaborone, Botswana;,
email: chipisel@gmail.com
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