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http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53121#.VLXOVsnQrzE
ABSTRACT
Brass
targets were irradiated with various laser pulses of Excimer laser
ranging from 1200 to 3000 for constant fluence of 3.4 J/cm2
in oxygen atmosphere (100 Torr). The surface morphology and
crystallographic analyses were performed by using Scanning Electron
Microscope (SEM) and X-Ray Diffractometer (XRD). SEM analysis reveals
the formation of laser-induced micro-sized cavities, bumps, cones and
wave-like ridges with non-uniform shape and density distribution. These
features are formed for all number of pulses; however with increasing
number of pulses from 1200 to 2400, the density of cavities decreases
whereas, the wave-like ridges become more pronounced and bump-formation
is vanished. For maximum number of 3000 shots, the appearance of cones
and wave-like ridges becomes diffusive, whereas the density and size of
cavities increase again. XRD analysis demonstrates that no new phases
are formed in irradiated brass. However, the change in peak intensity
along with lower and higher angle shifting is observed which is
attributed to generation of laser induced stresses. The Yield Stress
(YS), Ultimate Tensile Strength (UTS) as well as Microhardness increase
monotonically with increasing number of laser pulses.
Cite this paper
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