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The Effect of Heat Treatment on the Corrosion Behavior of Amorphous Mg–Ni–Nd Alloys

Published online by Cambridge University Press:  31 January 2011

C. H. Kam ,
Y. Li ,
S. C. Ng ,
A. Wee ,
J. S. Pan  and
H. Jones
C. H. Kam
Affiliation:
Department of Materials Science, National University of Singapore, Singapore 119260
Y. Li*
Affiliation:
Department of Materials Science, National University of Singapore, Singapore 119260
S. C. Ng
Affiliation:
Department of Physics, National University of Singapore, Singapore 119260
A. Wee
Affiliation:
Department of Physics, National University of Singapore, Singapore 119260
J. S. Pan
Affiliation:
Department of Physics, National University of Singapore, Singapore 119260
H. Jones
Affiliation:
Department of Engineering Materials, University of Sheffield, Sheffield, United Kingdom
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of heat treatment on the corrosion behavior of seven amorphous melt-spun Mg–Ni–Nd alloys containing 10–20 at.% Ni and 5–15 at.% Nd has been studied. Hydrogen evolution testing was used to determine the dissolution rate of the heat-treated specimens immersed in a 3% NaCl solution saturated with Mg(OH)2. The dissolution rates of the partially crystallized specimens were found to be lower than those of the untreated specimens, while the fully crystallized specimens exhibited marked deterioration of corrosion resistance. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies on the heat-treated specimens revealed precipitation of Mg3Nd, Mg12Nd, and Mg2Ni phases during the crystallization. TEM results show that the partially crystallized structure consists of uniform dispersion of either Mg3Nd or Mg2Ni in the amorphous matrix. In contrast, multiple phases precipitate in the fully crystallized specimen.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1638 - 1644
Copyright
Copyright © Materials Research Society 1999

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References

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