TY - JOUR U1 - Wissenschaftlicher Artikel 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 -