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Title: On development of NiMo-SiC alloys via powder metallurgy for the use in molten salt environment
Authors: Yang, C
Muránsky, O
Zhu, HL
Avdeev, M
Huang, HF
Huai, P
Zhou, XT
Keywords: Alloys
Metallurgical effects
Powder metallurgy
Molten salts
Neutron diffraction
Molten salt reactors
Issue Date: 27-Nov-2017
Publisher: Engineers Australia
Citation: Yang, C., Muránsky, O., Zhu, H., Avdeev, A., Huang, H., Huai, P., & Zhou, X. (2017). On development of NiMo-SiC alloys via powder metallurgy for the use in molten salt environment. In Prusty, G. & Paradowska, A. (eds) 9th Australasian Congress on Applied Mechanics (ACAM9), University of NSW, Sydney, 27-29 November 2017. (pp. 508-515). Retrieved from:
Abstract: A new generation of alloys, which rely on a combination of various strengthening mechanisms, has been developed for application in molten salt environment, namely in future molten salt reactors (MSR), and concentrating solar power (CSP) plants. In the current study, a battery of NiMo-based alloys containing varying amounts of SiC (0.5-2.5 wt%) were prepared by mechanical alloying from Ni-Mo-SiC powder mixture, The mechanical alloying was followed by spark plasma sintering 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 alloys. The present study shows that uniformly-dispersed SiC particles provide dispersion strengthening, the precipitation of nano-scale Ni3Si nano-precipitates provides precipitation strengthening, and the solid-solution of Mo in the Ni matrix provides solid-solution strengthening. In addition, formed Mo2C particles limit the grain growth of NiMo matrix thus further increasing the strength of these NiMo-SiC via Hall-Petch strengthening. As a result, these newly developed NiMo-SiC alloys possess superior strength in comparison to conventional forged NiMo alloys. However, it is shown that the cold welding of powders during the mechanical alloying leads to porosity, which might then lead to reduced ductility.© 2017 Engineers Australia
ISBN: 9781925627022
Appears in Collections:Conference Publications

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