Influence of lower current densities on the residual stress and structure of thick nickel electrodeposits |
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Authors: | Siddhartha Pathak Marion Guinard Zhao Wang Johann Michler Laetitia Philippe |
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Affiliation: | Empa, Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland |
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Abstract: | Thick Ni electrodeposits, with thicknesses ranging from 18 to 90 μm, have been produced from sulfamate baths using very low current densities (1.5-5 mA cm−2). Increasing grain sizes, with a corresponding decrease in the hardness values, and more columnar grain morphologies were observed with increasing current densities in the deposits. The anisotropy in the mechanical properties of the deposits were found to correlate strongly with the deposit texture, where the change from a < 101> dominated orientation at 1.5 mA cm−2 to a < 001> orientation at the higher (5 mA cm−2) current density led to a corresponding decrease in the indentation modulus values for the respective Ni films. The residual stress values measured in the deposits (75-136 MPa) were found to be comparable to literature values of deposits plated at higher current densities, which rules out any potential advantage from the use of such low current densities for producing lower residual stresses. |
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Keywords: | Nickel Electrodeposition Sulfamate bath Texture Anisotropy Back-scattered electron diffraction (EBSD) Indentation |
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