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