Ultra-fast boriding of nickel aluminide

O. Kahvecioglu*, V. Sista, O. L. Eryilmaz, A. Erdemir, S. Timur

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

In this study, we explored the possibility of ultra-fast electrochemical boriding of nickel aluminide (Ni3Al) in a molten borax electrolyte. Electrochemical boriding was performed at 950 °C for 15 min and at current densities ranging from 0.1 to 0.5 A/cm2. The boride layers formed on the test samples were 50 to 260 μm thick depending on the current density. The mechanical, structural, and chemical characterization of the boride layers was carried out using a Vickers micro-hardness test machine, optical and scanning electron microscopes, and a thin film X-ray diffractometer. The hardness of boride layer was in the range from 800 to 1200 ± 50 HV depending on the load and the region from which the hardness measurements were taken. X-ray diffraction studies confirmed that the boride layers were primarily composed of Ni3B, Ni4B3 and Ni 20AlB14 phases. Structurally, the boride layer was very homogenous and uniformly thick across the borided surface area.

Original languageEnglish
Pages (from-to)1575-1581
Number of pages7
JournalThin Solid Films
Volume520
Issue number5
DOIs
Publication statusPublished - 30 Dec 2011

Funding

The authors would like to thank the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, ITP , under contract number DE-AC02-06CH11357 with the U.S. Department of Energy for supporting this work. The electron microscopy study was accomplished at the Electron Microscopy Center for Materials Research at Argonne National Laboratory, a U.S. Department of Energy Office of Science Laboratory operated under contract no. DE-AC02-06CH11357 by UChicago Argonne, LLC. They would also like to thank for performing the X-ray diffraction study, which was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois. The authors would like to thank Gerald Jeka for doing the microscopy imaging and helping in sample preparation.

FundersFunder number
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
Argonne National Laboratory
Instituto de Tecnologia e Pesquisa, Universidade TiradentesDE-AC02-06CH11357

    Keywords

    • Boriding
    • Molten salt electrolysis
    • NiAlB
    • NiAl
    • NiB
    • NiB

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