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A comparative study of microstructure and mechanical behavior of CO2 and diode laser deposited Cu–38Ni alloy

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Abstract

Cu–38Ni alloy was deposited on C71500 (Cu–30Ni) substrates by a laser-aided direct metal deposition technique using CO2 and diode lasers. Structure–property relationships of deposited specimens were investigated by optical microscopy, electron microscopy, X-ray diffraction techniques, and microhardness and tensile measurements. Laser-deposited specimens’ microstructures were primarily dendritic, forming columnar grains growing epitaxially from the substrate and subsequent layers along the preferred crystallographic growth. The grain growth pattern and grain size distribution was significantly different in both specimens. The lattice parameter of the solid solution phase was relatively larger in diode laser-formed specimen; CO2 laser-formed specimens showed relatively higher but non-uniform hardness distribution whereas a very uniform hardness distribution was observed in diode laser formed specimens. Diode laser formed specimens showed higher tensile properties compared to CO2 laser formed specimens which were comparable to C71500 substrates. Microstructure and mechanical behavior were explained based on laser processing parameters.

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Acknowledgements

The current investigation was financially supported by the Office of Naval Research. Authors would like to thank the colleagues at the Electron Microscope Analysis Laboratory (EMAL) in University of Michigan and Focus: HOPE for their help in this work.

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Author notes

  1. Sudip Bhattacharya

    Present address: Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA, 15213, USA

  2. Guru P. Dinda

    Present address: Wayne State University, 5050 Anthony Wayne Dr., Detroit, MI, 48202, USA

Authors and Affiliations

  1. Center for Laser-Aided Intelligent Manufacturing, University of Michigan, 2350 Hayward Street, 2040 G.G. Brown Laboratories, Ann Arbor, MI, 48109, USA

    Sudip Bhattacharya & Jyotirmoy Mazumder

  2. Center for Advanced Technologies, Focus: HOPE, 1200 Oakman Blvd, Detroit, MI, 48238, USA

    Guru P. Dinda & Ashish K. Dasgupta

Authors
  1. Sudip Bhattacharya
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  2. Guru P. Dinda
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  3. Ashish K. Dasgupta
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  4. Jyotirmoy Mazumder
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Correspondence to Sudip Bhattacharya.

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Bhattacharya, S., Dinda, G.P., Dasgupta, A.K. et al. A comparative study of microstructure and mechanical behavior of CO2 and diode laser deposited Cu–38Ni alloy. J Mater Sci 49, 2415–2429 (2014). https://doi.org/10.1007/s10853-013-7883-7

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  • DOI: https://doi.org/10.1007/s10853-013-7883-7

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