Surface Analysis Correlated with Structural and Mechanical Properties of Laser Irradiated Brass

Shahbaz Ahmad,Nisar Ali,Daniel Yousaf,Tousif Hussain,Shazia Bashir

doi:10.4236/msa.2015.61004

Shahbaz Ahmad, Nisar Ali + Show 3 more

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https://doi.org/10.4236/msa.2015.61004

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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.

Highlights

IntroductionThe surface, structural and mechanical properties (yield stress, tensile strength and hardness) of metals and their alloys can be significantly improved by employing a variety of techniques such as ion beam modification, laserHow to cite this paper: Ahmad, S., Bashir, S., Yousaf, D., Ali, N. and Hussain, T. (2015) Surface Analysis Correlated with Structural and Mechanical Properties of Laser Irradiated Brass
The surface, structural and mechanical properties of metals and their alloys can be significantly improved by employing a variety of techniques such as ion beam modification, laser
The surface, structural and mechanical properties e.g. yield stress, tensile strength and hardness of brass can be improved by laser irradiation

Summary

Introduction

The surface, structural and mechanical properties (yield stress, tensile strength and hardness) of metals and their alloys can be significantly improved by employing a variety of techniques such as ion beam modification, laserHow to cite this paper: Ahmad, S., Bashir, S., Yousaf, D., Ali, N. and Hussain, T. (2015) Surface Analysis Correlated with Structural and Mechanical Properties of Laser Irradiated Brass. The surface, structural and mechanical properties (yield stress, tensile strength and hardness) of metals and their alloys can be significantly improved by employing a variety of techniques such as ion beam modification, laser. The surface, structural and mechanical properties e.g. yield stress, tensile strength and hardness of brass can be improved by laser irradiation. Bashir et al [5] have investigated the effect of laser pulses and ambient environment (dry or wet) and on the laser ablation performance of brass. Their results proposed that ambient environment plays a significant role in surface and structural modification of brass. For modified layers the hardness was increased from 110 HV to the range of 152 - 256 HV

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