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Neutralization of Impurity Elements of Cu and Ni in Mg-Zn Alloy by Dissolution into MgZn2 Phase

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Abstract:

Cu and Ni impurities in Mg alloys are deleterious contaminants that reduce the corrosion resistance of the alloy. Mg2Cu and Mg2Ni precipitates can cause significant anodic dissolution of the Mg matrix, owing to their potential difference. Suppression of these phases can prevent the deterioration of corrosion resistance. The neutralization of these impurities through the formation of MgZn2 intermetallic phases has been studied, because the atomic radii of Cu and Ni are similar to that of Zn. As a result, the MgZn2 phase may precipitate during the rapid cooling that occurs during the solidification of the Mg-6 mass% Zn alloy, and introduce substitutional impurity atoms in the crystal lattice. Mg (Zn, Cu, Ni)2 phase can be formed instead of Mg2Cu and Mg2Ni, in the presence of both of Zn and these impurities. In this study, the solubility of Cu and Ni into MgZn2 phase when they contain simultaneously was investigated by preparing the intermetallic compounds and the crystal structure evaluation. The lattice parameter of the MgZn2 phase containing both Cu and Ni impurity decreased to about 5.14 Å with increasing impurity concentration. Cu and Ni impurities are concentrated in the MgZn2 phase while maintaining the crystal structure, when the impurity concentrations are within the composition range of Cu + 2Ni ≦ 20 at.%. When the concentrations of Cu and Ni exceeded this range, the crystal structure of the MgZn2 phase transformed from hexagonal (hP12) to cubic (cF24).

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Periodical:

Solid State Phenomena (Volume 384)

Pages:

45-50

DOI:

https://doi.org/10.4028/p-6dT2xA

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Online since:

January 2026

Authors:

Kaito Uruchida*, Naoki Kadota, Taiki Morishige

Keywords:

Corrosion, Impurity Elements, Mg Alloy, Mg-Zn Alloy, MgZn2

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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