TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Khazi, Isman M.
A1  - Mescheder, Ulrich
A1  - Wilde, Jürgen
T1  - Influence of bath hydrodynamics on the micromechanical properties of electrodeposited nickel-cobalt alloys
JF  - Materials
N2  - The influence of bath hydrodynamics on the resultant micromechanical properties of electrodeposited nickel-cobalt alloy system is investigated. The bath hydrodynamics realized by magnetic stirring is simulated using COMSOL Multiphysics and a region of minimum variation in velocity within the electrolytic cell is determined and validated experimentally. Nickel-cobalt alloy and nickel coating samples are deposited galvanostatically (50 mA/cm2) with varying bath velocity (0 to 42 cm/s). The surface morphology of samples gradually changed from granular (fractal dimension 2.97) to more planar (fractal dimension 2.15) growth type, and the according average roughness decreased from 207.5 nm to 11 nm on increasing the electrolyte velocity from 0 to 42 cm/s for nickel-cobalt alloys; a similar trend was also found in the case of nickel coatings. The calculated grain size from the X-ray diffractograms decreased from 31 nm to 12 nm and from 69 nm to 26 nm as function of increasing velocity (up to 42 cm/s) for nickel-cobalt and nickel coatings, respectively. Consecutively, the measured Vickers microhardness values increased by 43% (i.e., from 393 HV0.01 to 692 HV0.01) and by 33% (i.e., from 255 HV0.01 to 381 HV0.01) for nickel-cobalt and nickel coatings, respectively, which fits well with the Hall–Petch relation.
KW  - Nanocrystalline nickel-cobalt alloys
KW  - Electrochemical deposition
KW  - Bath hydrodynamics
KW  - Diffusion layer thickness
KW  - Anomalous co-deposition
Y1  - 2021
SN  - 1996-1944
SS  - 1996-1944
U6  - https://doi.org/10.3390/ma14143898
DO  - https://doi.org/10.3390/ma14143898
VL  - 14.2021
IS  - 14
SP  - 28
S1  - 28
ER  -