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Jpn. J. Appl. Phys. 50 (2011) 01BE06 (7 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Effect of Mechanical Alloying Parameters on the Formation of Ni–Cu Solid Solution Coating on the Ni Balls

Iman Farahbakhsh, Alireza Zakeri, Palavesamuthu Manikandan1, Shigeru Tanaka2, and Kazuyuki Hokamoto2

School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, I. R. Iran
1Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
2Shock Wave and Condensed Matter Research Center, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan

(Received July 12, 2010; revised September 5, 2010; accepted September 22, 2010; published online January 20, 2011)

Mechanical alloying is a viable technique to produce coatings of limited thickness on a solid substrate. Elemental copper powder was mechanically alloyed with nickel balls in a planetary ball mill under various milling times and rotation speeds. The mutual diffusion of the elements during milling which led to the formation of a Ni–Cu solid solution and the creation of Ni–Cu coating on the surface of Ni balls was studied. The maximum hardness of the coating increased to threefold (HV0.01594) that of the substrate. Micro-structural characterization of the coating surface using optical microscope, scanning electron microscope (SEM), and electron probe micro-analyzer (EPMA) indicates that, by using appropriate processing conditions, a thick, fully-dense coating can be metallurgically bonded to the nickel balls. X-ray diffraction (XRD) results revealed the formation of nanocrystalline solid solutions.

URL: http://jjap.jsap.jp/link?JJAP/50/01BE06/
DOI: 10.1143/JJAP.50.01BE06
PACS: 81.20.Wk, 81.20.Ev, 81.15.-z, 81.40.Cd


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