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Structural transitions during aluminum leaching of NiAl3 phase in a Raney Ni–Al alloy

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Abstract

Structural transitions during aluminum leaching of the NiAl3 phase in a Raney nickel–aluminum alloy have been investigated by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and X-ray energy dispersive spectroscopy. We observed that NiAl3 grains cracked into crystalline nano-fragments at the initial stage of leaching. A possible mechanism for the grain fragmentation was proposed based on the crystal structure of NiAl3. We discovered that fcc nickel, the known active phase, coexisted with another active nickel phase with an orthorhombic structure in the Raney-Ni catalyst. The orthorhombic nickel phase was generated directly from its source phase, NiAl3, and further transformed to the fcc nickel phase during aluminum leaching

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Acknowledgements

This study is supported partially by funding from the Chinese Institute of Petroleum Processing Research. We thank Dr. Baoning Zong for providing experimental materials for this study and Professors Enze Min, Wanzhen Lu and Drs. Baoning Zong, Xuhong Mu for fruitful and enlightening discussions.

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Authors and Affiliations

  1. Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Rong Wang, Houwen Chen, Zhilong Lu, Shaohong Qiu & Tsun Ko

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  1. Rong Wang
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  2. Houwen Chen
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Correspondence to Rong Wang.

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Wang, R., Chen, H., Lu, Z. et al. Structural transitions during aluminum leaching of NiAl3 phase in a Raney Ni–Al alloy. J Mater Sci 43, 5712–5719 (2008). https://doi.org/10.1007/s10853-008-2901-x

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  • DOI: https://doi.org/10.1007/s10853-008-2901-x

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