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Title: On the origin of strengthening mechanisms in Ni-Mo alloys prepared via powder metallurgy
Authors: Yang, C
Muránsky, O
Zhu, HL
Thorogood, GJ
Huang, HF
Zhou, XT
Keywords: Powder metallurgy
Transmission electron microscopy
Electron diffraction
Molten salt reactors
Nickel alloys
Molybdenum alloys
Issue Date: 5-Jan-2017
Publisher: Elsevier
Citation: Yang, C., Muránsky, O., Zhu, H., Thorogood, G. J., Huang, H., & Zhou, X. (2017). On the origin of strengthening mechanisms in Ni-Mo alloys prepared via powder metallurgy. Materials & Design, 113, 223-231. doi:10.1016/j.matdes.2016.10.024
Abstract: A new class of materials, which rely on the dispersion strengthening of SiC particles in addition to precipitation strengthening by nano-precipitates is being developed for the application in molten salt nuclear reactors. A battery of dispersion and precipitation strengthened (DPS) NiMo-based alloys containing varying amount of SiC (0.5–2.5 wt.%) was prepared via a mechanical alloying (MA) route followed by spark plasma sintering (SPS), rapid cooling, high-temperature annealing and water quenching. Lab X-ray Diffraction (XRD), Electron Back Scattering Diffraction (EBSD), and Transmission Electron Microscopy (TEM) were employed in the microstructural characterization of this new type of alloys. It is shown that the NiMo matrix of these alloys is effectively reinforced by dispersion of SiC from the initial powder mixture and nano-Ni3Si precipitates, which precipitated during the sintering/annealing process. Furthermore, the matrix is strengthened by solid-solution of Mo in Ni. As a result, these newly developed NiMo alloys take advantage of dispersion, precipitation and solid solution strengthening, which leads to their superior mechanical properties. © 2016 Elsevier Ltd
ISSN: 0264-1275/
Appears in Collections:Journal Articles

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