Journal of Materials Science

, Volume 49, Issue 6, pp 2415–2429 | Cite as

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

  • Sudip Bhattacharya
  • Guru P. Dinda
  • Ashish K. Dasgupta
  • Jyotirmoy Mazumder


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.


Diode Laser Grain Size Distribution Select Area Electron Diffraction Pattern Alloy Specimen Powder Feed Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



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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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Sudip Bhattacharya
    • 1
    • 3
  • Guru P. Dinda
    • 2
    • 4
  • Ashish K. Dasgupta
    • 2
  • Jyotirmoy Mazumder
    • 1
  1. 1.Center for Laser-Aided Intelligent ManufacturingUniversity of MichiganAnn ArborUSA
  2. 2.Center for Advanced TechnologiesFocus: HOPEDetroitUSA
  3. 3.Carnegie Mellon UniversityPittsburghUSA
  4. 4.Wayne State UniversityDetroitUSA

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