Atom-probe study of the initial stage of selective oxidation of Ni from the CuNi alloy system : K. Hono, T. Iwata, M. Nakamura, H.W. Pickering Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA I. Kamiya and T. Sakurai The Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan