Abstract
Dissimilar joining of magnesium and aluminum using a compound casting process was investigated in the present work. For the first time, a Ni interlayer prepared by plasma spraying was inserted between the two base metals to improve the interfacial characteristics. Examination of the interfacial regions using scanning electron microscopy, energy-dispersive X-ray spectroscopy, electron probe microanalysis, and X-ray diffraction revealed the formation of a three-layered interface between Mg and Al without the interlayer. The thickness of the interface was approximately 600 μm when the casting was performed at 700 °C and increased with increasing casting temperature. However, with the addition of the Ni interlayer, the Al-Mg reaction was successfully prevented, and metallurgical bonding between the Ni interlayer and two base metals was achieved at a casting temperature of 700 °C. Upon increasing this temperature, Mg-Ni and Al-Ni intermetallics were generated at the separate interfaces. The shear strength of the Mg/Al bimetallic castings with the Ni interlayer was substantially improved compared with that of the direct Mg/Al joint, with a maximum value of 25.4 MPa achieved at 700 °C. Fracture occurred mainly along the Mg/Ni interface for the Mg/Ni/Al multilayer structure castings.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (NSFC) under Grant No. 51505122, and the Natural Science Foundation of Hebei Province under Grant No. E2016202088.
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Manuscript submitted January 2, 2017.
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Liu, N., Liu, C., Liang, C. et al. Influence of Ni Interlayer on Microstructure and Mechanical Properties of Mg/Al Bimetallic Castings. Metall Mater Trans A 49, 3556–3564 (2018). https://doi.org/10.1007/s11661-018-4688-y
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DOI: https://doi.org/10.1007/s11661-018-4688-y