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Microstructures of electroless Ni–P alloy deposits and their transformation sequences during post-deposition annealing

Published online by Cambridge University Press:  31 January 2011

Y. Gao ,
Z.J. Zheng ,
M.Q. Zeng ,
C.P. Luo  and
M. Zhu
Y. Gao
Affiliation:
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, People’s Republic of China
Z.J. Zheng
Affiliation:
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, People’s Republic of China
M.Q. Zeng
Affiliation:
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, People’s Republic of China
C.P. Luo
Affiliation:
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, People’s Republic of China
M. Zhu*
Affiliation:
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Ni–P deposits of amorphous, nanocrystalline, and mixed structures were prepared by electroless deposition. The three deposits were hypoeutectic Ni–P alloys with different P concentrations. The overall transformation sequences of the deposits during post-deposition annealing were investigated using differential scanning calorimetry, x-ray diffraction, and transmission electron microscopy. It was found that there existed three heat-release peaks in a mixed-structure deposit during annealing. The first peak came from the precipitation of Ni nanocrystallites from an amorphous matrix, the second peak resulted from the decomposition of the retained amorphous matrix into Ni + Ni3P having a composition close to the eutectic point, and the third peak, newly found in hypoeutectic Ni–P alloys, was assumed to be caused by both grain growth and the precipitation of Ni3P from as-deposited supersaturated Ni(P) nanocrystals interspersed within the amorphous matrix. By comparing the transformation sequences of the amorphous deposit with that of the nanocrystalline deposits, it was concluded that the transformation sequence of the mixed-structure deposit was a superimposition of those of both the amorphous and nanocrystalline deposits.

Keywords

AmorphousAnnealingNi
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 5 , May 2008 , pp. 1343 - 1349
Copyright
Copyright © Materials Research Society 2008

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