The effect of milling time on the microstructural characteristics and strengthening mechanisms of NiMo-SiC alloys prepared via powder metallurgy

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dc.contributor.authorYang, Cen_AU
dc.contributor.authorMuránsky, Oen_AU
dc.contributor.authorZhu, HLen_AU
dc.contributor.authorThorogood, GJen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorHuang, HFen_AU
dc.contributor.authorZhou, XTen_AU
dc.date.accessioned2021-06-28T20:38:57Zen_AU
dc.date.available2021-06-28T20:38:57Zen_AU
dc.date.issued2017-04-06en_AU
dc.date.statistics2021-06-16en_AU
dc.description.abstractA new generation of alloys, which rely on a combination of various strengthening mechanisms, has been developed for application in molten salt nuclear reactors. In the current study, a battery of dispersion and precipitation-strengthened (DPS) NiMo-based alloys containing varying amounts of SiC (0.5–2.5 wt %) were prepared from Ni-Mo-SiC powder mixture via a mechanical alloying (MA) route followed by spark plasma sintering (SPS) and rapid cooling. Neutron Powder Diffraction (NPD), Electron Back Scattering Diffraction (EBSD), and Transmission Electron Microscopy (TEM) were employed in the characterization of the microstructural properties of these in-house prepared NiMo-SiC DPS alloys. The study showed that uniformly-dispersed SiC particles provide dispersion strengthening, the precipitation of nano-scale Ni3Si particles provides precipitation strengthening, and the solid-solution of Mo in the Ni matrix provides solid-solution strengthening. It was further shown that the milling time has significant effects on the microstructural characteristics of these alloys. Increased milling time seems to limit the grain growth of the NiMo matrix by producing well-dispersed Mo2C particles during sintering. The amount of grain boundaries greatly increases the Hall–Petch strengthening, resulting in significantly higher strength in the case of 48-h-milled NiMo-SiC DPS alloys compared with the 8-h-milled alloys. However, it was also shown that the total elongation is considerably reduced in the 48-h-milled NiMo-SiC DPS alloy due to high porosity. The porosity is a result of cold welding of the powder mixture during the extended milling process. © This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).en_AU
dc.identifier.citationYang, C., Muránsky, O., Zhu, H., Thorogood, G. J., Avdeev, M., Huang, H., & Zhou, X. (2017). The effect of milling time on the microstructural characteristics and strengthening mechanisms of NiMo-SiC alloys prepared via powder metallurgy. Materials, 10(4), 389. doi:10.3390/ma10040389en_AU
dc.identifier.issn1996-1944en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleMaterialsen_AU
dc.identifier.pagination389en_AU
dc.identifier.urihttps://doi.org/10.3390/ma10040389en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10916en_AU
dc.identifier.volume10en_AU
dc.language.isoenen_AU
dc.publisherMultidisciplinary Digital Publishing Instituteen_AU
dc.subjectPowder metallurgyen_AU
dc.subjectTransmission electron microscopyen_AU
dc.subjectBackscatteringen_AU
dc.subjectMolten salt reactorsen_AU
dc.subjectAlloysen_AU
dc.subjectNeutron diffractionen_AU
dc.titleThe effect of milling time on the microstructural characteristics and strengthening mechanisms of NiMo-SiC alloys prepared via powder metallurgyen_AU
dc.typeJournal Articleen_AU
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