Microstructure and Mechanical Properties of Nanocrystalline Tungsten Thin Films

Abstract

Abstract:

Tungsten (W) thin films were prepared by magnetron sputtering onto Si (100) substrates. Their microstructures were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The hardness and modulus were evaluated by nanoindentation. It is found that a 30 nm Cr sticking layer induces structure changes of deposited W film from β-W to α-W structure. In addition, remarkable hardness enhancement both for the deposited and annealed W films, were compared with that of bulk coarse-grained W, although their nanoindentation modulus is very close to that of corresponding bulk W. The intrinsic reasons that lead to structure changes and super hardness are discussed.

Key words: Tungsten film, Microstructure, Nanoindentation, Hardness, Modulus

H.L. Sun Z.X. Song D.G. Guo F. Ma K.W. Xu. Microstructure and Mechanical Properties of Nanocrystalline Tungsten Thin Films[J]. J Mater Sci Technol, 2010, 26(1): 87-92.

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