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International Journal of Metallurgical & Materials Engineering Volume 1 (2015), Article ID 1:IJMME-102, 6 pages
http://dx.doi.org/10.15344/2455-2372/2015/102
Research Article
Novel Synthesis of Nanocrystalline Nickel Dispersed with Nano-size WO3 Particles by Electrodeposition

Yushi Kato1, Hiroshi Fujiwara1, Hiroyuki Miyamoto1* and Takuya Goto2

1Department of Mechanical Engineering, Doshisha University, 1-3 Miyakodani, Tatara, Kyotanabe, Kyoto 610-0321, Japan
2Department of Environmental System Engineering, Doshisha University, 1-3 Miyakodani, Tatara, Kyotanabe, Kyoto 610-0321, Japan
Dr. Hiroyuki Miyamoto, Department of Mechanical Engineering, Doshisha University, 1-3 Miyakodani, Tatara, Kyotanabe, Kyoto 610-0321, Japan; E-mail: hmiyamot@mail.doshisha.ac.jp
17 February 2015; 04 April 2015; 06 April 2015
Kato Y, Fujiwara H, Miyamoto H, Goto T (2015) Novel Synthesis of Nanocrystalline Nickel Dispersed with Nano-size WO3 Particles by Electrodeposition. Int J Metall Mater Eng 1: 102. doi: http://dx.doi.org/10.15344/2455-2372/2015/102
This work is financially supported by Grant-in-Aid for Scientific Research on Innovative Areas “Bulk nano metals,” MEXT Japan.

Abstract

Bulk nanocrystalline nickel dispersed homogenously with nano-scale hard WO3 particles has been successfully synthesized by a novel synthesis using electrodeposition. In this synthesis, ionized WO42- molecules in an electrolyte were transformed into WO3 particles and embedded into a nanocrystalline nickel matrix during electrodeposition by controlling the pH and potential of the electrode. The effect of the presence of nano-size oxide dispersions on the strength and thermal stability of nanocrystalline structures was demonstrated. This is indeed a new class of bulk nanocrystalline metals in that nano-scale second-phase particles are not reactive precipitate from the solute-supersaturated matrix, but are stable oxide particles resistant to the so-called Ostwald ripening. In this regard, future optimization of this synthesis have potential to realize nanocrystalline metals with record-high strength and thermal stability, superior to their precipitates- or solutes-stabilized counterparts.