Structure and microstructure of leached Raney-type Al–Ni powders
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The structure and microstructure of some leached Raney-type Al–Ni alloys of different compositions have been investigated by neutron diffraction and by small-angle neutron scattering. It was found that all alloys contain a crystalline face-centred cubic (fcc) Ni phase as well as an Al3Ni2 phase, the amount of which is decreasing with increasing Al content of the initial alloy. Both the Ni and the Al3Ni2 phases are conjectured to be non-stoichiometric. There is no indication of any other crystalline phase. The size of the Ni crystallites in all leached alloys has been found to be of the order of 30 Å, whereas the size of the Al3Ni2 ones varies with initial alloy composition and is found to be in the range of 100–250 Å. The change in structure by doping the initial alloys with small amounts of Ti and Cr is after leaching marginal.
KeywordsNeutron Diffraction Al3Ni2 Heavy Water Bayerite Initial Alloy
This study is based on experiments performed at the Swiss spallation neutron source SINQ, Paul Scherrer Institute, Villigen, Switzerland, and has been supported by the European Commission under the 6th Framework Programme through the Key Action: Strengthening the European Research Area, Research Infrastructures, Contract no.: RII3-CT-2003-505925. During the HRPT experiments as well as for the data analysis the authors were very much profiting from the assistance of Denis Sheptyakov and during the measurements on SANS-II the attention of Thomas Geue was very much appreciated. This research is furthermore supported by the IMPRESS Integrated Project (Contract NMP3-CT-2004-500635) that is co-funded by the European Commission in the 6th Framework Programme, the European Space Agency and the Swiss Government.
- 24.https://doi.org/sinq.web.psi.ch/sinq. Accessed 26 Mar 2009
- 28.https://doi.org/www.ill.eu/dif/software. Accessed 26 Mar 2009
- 30.Porod G (1982) In: Glatter O, Kratky O (eds) General theory in small-angle x-ray and neutron scattering. Academic Press, London, pp 17–51Google Scholar