Metallurgical and Materials Transactions A

, Volume 43, Issue 8, pp 2574–2580 | Cite as

Characterization of Individual Microneedles Formed on Alloy Surfaces by Femtosecond Laser Ablation

  • Sudip Bhattacharya
  • Dong Hyuck Kam
  • Lijun Song
  • Jyotirmoy Mazumder


Cross-sectional microstructural analyses of micron/nano-sized structures (termed microneedles) formed by low and high fluence pulse laser ablation of AISI 4340 steel, Ti6Al4V, and Al 5754 alloy specimens were performed. Dependence of length scale and orientation of microneedle microstructures on energy absorptance during laser irradiation, heat transfer direction, absorptivity, and thermal conductivity of the material was established. Microneedle nucleation and growth process were explained based on penetration depths, redeposition of ablated material, and ablation rates.


Laser Fluence Femtosecond Laser Ablation High Laser Fluence Fluence Regime Ti6Al4V Surface 
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 Focus: HOPE (Detroit, MI) through funds from the Office of Naval Research. The authors acknowledge Dr. Kai Sun, EMAL, University of Michigan, for his help with the characterizations.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2012

Authors and Affiliations

  • Sudip Bhattacharya
    • 1
  • Dong Hyuck Kam
    • 1
    • 2
  • Lijun Song
    • 1
  • Jyotirmoy Mazumder
    • 1
  1. 1.Center for Laser Aided Intelligent Manufacturing (CLAIM)University of MichiganAnn ArborUSA
  2. 2.LED Product & Technology, LED BusinessSamsung Electronics Co., Ltd.Yongin-CitySouth Korea

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