Materials Transactions Online

Materials Transactions, Vol.48 No.05 (2007) pp.996-1000
© 2007 The Japan Institute of Metals

Ni-W Amorphous/Nanocrystalline Duplex Composite Produced by Electrodeposition

Yoshihisa Kimoto1, Akihito Giga1, Tadakatsu Ohkubo2, Yorinobu Takigawa1, K. Hono2 and Kenji Higashi1

1Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan
2National Institute for Materials Science, Tsukuba 305-0047, Japan

Detailed characterizations are performed to identify the nanostructures of electrodeposited Ni-W alloys with grain size of 5 and 8 nm. Three-dimensional atom probe (3DAP) analyses have clarified that, in both alloys, experimentally measured W-concentration distributions fit well to the bimodal binomial distribution compared to the single binomial distribution. This result indicates the coexistence of W-depleted and W-enriched phases in the alloys. Nano-beam diffraction (NBD) patterns and energy dispersive x-ray spectroscopy (EDS) analyses revealed that the W-enriched phase is amorphous and that the W-depleted phase is nanocrystalline. The W-concentration visualizations on the cross section of 3DAP analysis volume identify them as amorphous/nanocrystalline duplex composites.

(Received 2006/11/24; Accepted 2007/3/2; Published 2007/4/25)

Keywords: nanocrystalline materials, three-dimensional atom probe, duplex composite, nickel alloys

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