Abstract
The thermal stability up to 800 °C of a nanocrystalline (NC) Ni (mean grain size ~25 nm) with ~4 wt% Al dispersed in the form of ~160-nm-sized particles, which was fabricated by co-electrodeposition from a nickel sulfate bath, has been investigated using differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results showed that microstructural evolution of the composite is temperature dependent, i.e., normal grain growth of the NC Ni, ~0.6 wt% Al solution into the Ni matrix and direct reaction between Al and Ni to form Ni3Al precipitates occurred at ~290, ~325 and ~575 °C, respectively. The distribution of Al in Ni matrix with temperature is fully discussed.
Graphical Abstract
A DSC scanning up to 800 °C of a nanocrystalline Ni matrix dispersing ~4 wt% Al particles (mean size: 160 nm) shows the particles did not significantly affect the normal grain growth of NC Ni and they have been converted into Ni3Al and Al solute atoms.
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The work is supported by National Basic Research Program (No. 2010CB934604) of China, Ministry of Science and Technology China.
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Zheng, L., Peng, X. & Wang, F. Thermal stability up to 800 °C of a Ni–4 wt% Al nanocomposite. J Mater Sci 47, 7759–7763 (2012). https://doi.org/10.1007/s10853-012-6501-4
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DOI: https://doi.org/10.1007/s10853-012-6501-4