Abstract

Iron-carbon-boron (Fe-C-B) alloy films have been prepared by cathodic deposition from an aqueous solution containing iron(II) chloride hydrate, malic acid, and dimethylamineborane (DMAB). Effects of DMAB concentration on the structural and mechanical characteristics were investigated with an analysis of evolved gas, X-ray diffraction, X-ray photoelectron spectroscopy, and measurements of Vickers hardness number, fracture toughness, and wear volume. The Fe-C-B alloy films had a martensitic structure with body-centered tetragonal lattice with interstitial carbon and boron atoms, and showed high Vickers hardness number of around 700 by solid solution hardening, irrespective of DMAB concentration. The Fe-0.96 mol % C-0.64 mol % B alloy film showed excellent fracture toughness and decreased wear volume, compared with those for Fe-C alloy films. The improvement in fracture toughness and wear resistance was achieved by decreasing the content of oxygen impurity in the films. © 2002 The Electrochemical Society. All rights reserved.

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