Abstract
Electrodeposition method was employed to produce freestanding Ni-W alloy foils. The foils consist of nanograins. The structure of the foil, e.g. texture, grain morphology, size distribution, and the nature of grain boundaries, were characterized using X-ray diffraction and high-resolution electron microscopy. The deposited foils exhibit an equiaxed nanocrystalline structure having a grain size value of about 6 nm. Two types of grain boundary structure were observed. One type of grain boundary is essentially one atomic layer thin and another type consists of a structureless layer of about 0.5–1 nm in thickness. Angular dark field (Z-contrast) image of the deposited foils showed an inhomogeneous distribution of W solutes. In some local regions, the W content actually exceeds the equilibrium solid solution limit. Many grain boundaries with a structureless layer of about 0.5–1 nm are probably a result of local supersaturation of W.
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Iwasaki, H., Higashi, K. & Nieh, T.G. Effect of Solid-Solution W Addition on the Nanostructure of Electrodeposited Ni. MRS Online Proceedings Library 740, 328 (2002). https://doi.org/10.1557/PROC-740-I3.28
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DOI: https://doi.org/10.1557/PROC-740-I3.28