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Special Section: Micromanufacturing

Micromachining Characteristics of NiTi Based Shape Memory Alloy Using Femtosecond Laser

[+] Author and Article Information
Nitin Uppal

Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019

Panos S. Shiakolas1

Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019shiakolas@uta.edu

1

Corresponding author.

J. Manuf. Sci. Eng 130(3), 031117 (Jun 03, 2008) (7 pages) doi:10.1115/1.2936380 History: Received November 12, 2007; Revised April 16, 2008; Published June 03, 2008

Femtosecond laser micromachining (FLM) is a relatively new and promising technology for the micromachining of a wide spectrum of engineering materials with micron and submicron size features. The interaction mechanism of femtosecond laser pulses with matter is not the same as that found in traditional lasers. This manuscript presents a detailed study of the ablation characteristics of a nickel-titanium (NiTi) shape memory alloy in air with femtosecond laser pulses. The single- and multishot ablation threshold fluence and the incubation coefficient (predicting the extent to which accumulation could take place in a material) are evaluated. In addition, morphological changes, such as the emergence of a ripple pattern, are discussed along with the identification of gentle and strong ablation phases. This study provides for the understanding and characterization of NiTi micromachining using FLM technology, which could aid in the identification of new applications for smart materials in the macro-, nano-, and microelectromechanical system domains using this technology.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

FLM system in our laboratory

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Figure 2

Plot of single-shot ablation threshold fluence for nitinol

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Figure 6

Representative accumulation curve and incubation effect for nitinol for gentle and strong ablation regimes, (a) incubation coefficient for gentle ablation and (b) incubation coefficient for strong ablation

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Figure 7

Morphology of nitinol irradiated with ten pulses at 1.13J∕cm2

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Figure 8

Machined channels on nitinol in the gentle and strong ablation regimes, (a) all four channels (scale line 100μm), (b) 1.13J∕cm2 applied fluence (scale line 50μm), (c) 3.38J∕cm2 applied fluence (scale line 50μm), and (d) 5.64J∕cm2 applied fluence (scale line 50μm)

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Figure 5

NiTi craters at 2.26J∕cm2 with (a) 10, (b) 100, (c) 500, and (d) 1000 pulses (scale line 25μm)

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Figure 4

Gentle and strong ablation threshold for nitinol

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Figure 3

Plot of single- and multishot ablation threshold fluence for nitinol

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