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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: memzhu@scut.edu.cn
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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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References

REFERENCES

1Beer, C.F., Longfield, P.D.Sadeghi, M.: The effect of heat treatment on the corrosion resistance of electroless nickel-phosphorus deposits. Corros. Prev. Control 6, 5 1983Google Scholar
2Lu, K.: Nanocrystalline metals crystallized from amorphous solids: Nanocrystallization, structure and properties. Mater. Sci. Eng., R 16, 161 1996CrossRefGoogle Scholar
3Bai, A., Chuang, P.Y.Hu, C.C.: The corrosion behavior of Ni–P deposits with high phosphorous contents in brine media. Mater. Chem. Phys. 82, 93 2003CrossRefGoogle Scholar
4Daly, B.P.Barry, F.J.: Electrochemical nickel-phosphorus alloy formation. Int. Mater. Rev. 48, 3269 2003CrossRefGoogle Scholar
5Erb, U., EI-Sherik, A.M., Palumbo, G.Aust, K.T.: Synthesis, structure and properties of electrodeposited nanocrystalline materials. Nanostruct. Mater. 2, 383 1993CrossRefGoogle Scholar
6Apachitei, I.Duszczyk, J.: Autocatalytic nickel coatings on aluminum with improved abrasive wear resistance. Surf. Coat. Technol. 132, 89 2000CrossRefGoogle Scholar
7Lu, K., Wang, J.T.Wei, W.D.: A new method for synthesizing nanocrystalline alloys. J. Appl. Phys. 69, 522 1991CrossRefGoogle Scholar
8Habazaki, H., Lu, Y.P., Kawashima, A., Asami, K.Hashimoto, K.: The effect of structural relaxation and crystallization on the corrosion behavior of electrodeposited amorphous Ni–P alloys. Corros. Sci. 32, 1227 1991CrossRefGoogle Scholar
9Bonino, J.P., Bruet-Hotellaz, S.Bories, C.: Thermal stability of electrodeposited Ni–P alloys. J. Appl. Electrochem. 27, 1193 1997CrossRefGoogle Scholar
10Hentschel, T.H., Isheim, D., Kirchheim, R., Muller, F.Kerye, H.: Nanocrystaline Ni-3.6at.%P and its transformation sequence studied by atom-probe field-ion microscopy. Acta Mater. 48, 933 2000CrossRefGoogle Scholar
11Boylan, K., Ostrander, D., Erb, U., Palumbo, G.Aust, K.T.: An in-situ TEM study of the thermal stability of nanocrystalline Ni–P. Scripta Metall. Mater. 25, 2711 1991CrossRefGoogle Scholar
12Ding, W., Wang, M.H., Hsiao, C.M., Xu, Y.Tian, Z.Z.: Crystallization, hydrogen permeation and hydrogen embrittlement of amophous NiP alloy. Scripta Metall. 21, 1685 1987CrossRefGoogle Scholar
13Gao, Y., Zheng, Z.J., Zhu, M.Luo, C.P.: Corrosion resistance of electrolessly deposited Ni–P and Ni-W-P alloys with various structures. Mater. Sci. Eng., A 381, 98 2004CrossRefGoogle Scholar
14International Center for Diffraction Data: Powder Diffraction Files: PCPDFWIN, Version 2.02 JCPDS-International Center for Diffraction Data Newton Square, PA 1999Google Scholar
15Fluck, E.Heumann, K.G.: Periodic Table of the Elements VCH Germany 1993Google Scholar
16Farber, B., Cadel, E., Menand, A., Schmitz, G.Kirchheim, R.: Phosphorus segregation in nanocrystaline Ni-3.6at.%P alloy investigated with tomographic atom probe. Acta Mater. 48, 789 2000CrossRefGoogle Scholar