Abstract
The influence of small additions (1 to 2 at.%) of some elements (chromium, copper, silicon, aluminium, iron, titanium, vanadium) on the solidification behaviour and crystallography of Ni(α)-Ni3B eutectic composition is examined by differential thermal analysis, X-ray and electron diffractions, scanning and transmission electron microscopy. With the exception of Fe-doped eutectic alloys, all the alloys whether doped or undoped exhibit a very large undercooling for the nucleation of Ni3B. We give an interpretation of the controversial hypothesis of this undercooling. We propose a crystallographic orientation relationship between the cubic phase Ni(α) and the orthorhombic phase Ni3B in the lamellar eutectic Ni-Ni3B. We also examine a complex transformation which occurs in Ni3B during slow cooling.
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Ajao, J., Hamar-Thibault, S. Influence of additions on the solidification behaviour of Ni-B alloys — crystallography of Ni-Ni3B eutectic. J Mater Sci 23, 1112–1125 (1988). https://doi.org/10.1007/BF01154022
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DOI: https://doi.org/10.1007/BF01154022