ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Zinc–nickel alloys with 0 to 13 wt % of nickel were electrodeposited from a chloride bath. The structure and microstructure change of as-deposited alloys versus the nickel content in the deposits is shown here. From X-ray diffraction an electrodeposited phase diagram in which the substitution of Zn by Ni atoms in η or γ structure induces a lattice distortion has been defined. In contrast to the thermodynamic phase diagram, the δ phase does not appear in as-deposited coatings. Two composition ranges have been defined, the first of which corresponds to the formation of a solid solution sursaturated in nickel (ηd) for the alloys containing up to 7.4 wt % of nickel. The second, corresponds to the formation of a γ phase out of equilibrium unsaturated in nickel. For an increase in nickel, the added atoms are preferentially incorporated into this unsaturated γ phase, and the ηd phase gradually disappears up to 13 wt % of nickel. The δ phase is obtained in electrodeposited alloys only after heat treatment at 200 °C. The δ phase recrystallized from metastable phases ηd and γd.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004553803788
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