Fabrication of Homogeneous Bulk Nanocrystalline Ni-W Alloys by an Electroforming Process


Article Preview

Many studies have been conducted on mechanical properties in nanocrystalline Ni-W alloys. However, since these results are obtained in the specimens whose thickness is less than 100 μm and whose homogeneity is not strictly controlled, an inherent potential of the nanocrystalline Ni-W alloy may be hidden. Therefore, it is necessary to fabricate the bulk Ni-W alloy with sufficient thickness and homogeneity. In the present study, we develop novel electroforming process and fabricate the homogeneous nanocrystalline Ni-W alloys. The homogeneities of W-concentration in micrometer scale are confirmed by the W-concentration profiles obtained by the linear analyses of the energy dispersed spectroscopy (EDS). The single-phase nanocrystalline bulk Ni-W alloy with the thickness above 2 mm and minimized W-concentration gradient and fluctuation is featured for the first time.



Advanced Materials Research (Volumes 26-28)

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee




A. Fujii et al., "Fabrication of Homogeneous Bulk Nanocrystalline Ni-W Alloys by an Electroforming Process", Advanced Materials Research, Vols. 26-28, pp. 691-694, 2007

Online since:

October 2007




[1] J. Karch, R. Birringer and H. Gleiter: Nature, Vol. 330 (1987) p.556.

[2] C.C. Koch and T.R. Malow: Materials Science Forum, Vol. 312 (1999) p.565.

[3] C.C. Koch, D.G. Morris, K. Lu and A. Inoue: Mater. Res. Soc. Bull., Vol. 24 (1999) p.54.

[4] W. Ehrfeld, V. Hessel, H. Loewe, Ch. Schlz and L. Weber : Proc. of 2nd Int. Conf. of Micro Materials'97, Berlin, (1997) p.112.

[5] K. Suzuki, F. Itoh, T. Fukunaga and T. Honda: Proc. of 3rd Int. Conf. of Rapidly Quenched Metals, Brighton, Vol. 2 (1978) p.410.

[6] D.G. Morris: Mechanical Behavior of Nanostructured Materials, Trans Tech Publications, Switzerland (1998).

[7] A. Giga, Y. Kimoto, Y. Takigawa, K. Higashi: Scripta Mater., Vol. 46 (2002) p.43.

[8] T. Morikawa, M. Yokoi, T. Nakade, Y. Sato, K. Ishida, S. Yuya: JP Patent 2001158998 (2001).

[9] Y. Kimoto, S. Wakayama, A. Fujii, Y. Takigawa and K. Higashi: Mater. Trans., Vol. 48 (2007) p.1483.

[10] T. Watanabe: J. JPN. Inst. Met. Vol. 66 (2002) p.339.

[11] Y. Kimoto, A. Giga, T. Ohkubo, Y. Takigawa, K. Hono and K. Higashi: Mater. Trans., Vol. 48 (2007) p.996.

DOI: https://doi.org/10.2320/matertrans.48.996

[12] Y. Kimoto: Ph. D. thesis, Osaka Prefecture University (2007).