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Effect of nature and pressure of ambient environments on the surface morphology, plasma parameters, hardness, and corrosion resistance of laser-irradiated Mg-alloy

Published online by Cambridge University Press:  24 April 2015

Asadullah Dawood ,
Shazia Bashir ,
Mahreen Akram ,
Asma Hayat ,
Sajjad Ahmed ,
Muhammad Hassan Iqbal  and
Ali Hassan Kazmi
Asadullah Dawood
Affiliation:
Centre for Advanced Studies in Physics (CASP), Government College University Lahore, Lahore, Pakistan
Shazia Bashir*
Affiliation:
Centre for Advanced Studies in Physics (CASP), Government College University Lahore, Lahore, Pakistan
Mahreen Akram
Affiliation:
Centre for Advanced Studies in Physics (CASP), Government College University Lahore, Lahore, Pakistan
Asma Hayat
Affiliation:
Centre for Advanced Studies in Physics (CASP), Government College University Lahore, Lahore, Pakistan
Sajjad Ahmed
Affiliation:
Centre for Advanced Studies in Physics (CASP), Government College University Lahore, Lahore, Pakistan
Muhammad Hassan Iqbal
Affiliation:
Centre for Advanced Studies in Physics (CASP), Government College University Lahore, Lahore, Pakistan
Ali Hassan Kazmi
Affiliation:
Centre for Advanced Studies in Physics (CASP), Government College University Lahore, Lahore, Pakistan
*
Address correspondence and reprint requests to: Shazia Bashir, Centre for Advanced Studies in Physics (CASP), Government College University Lahore, Katchery Rd, Lahore 54000, Pakistan. E-mail: shaziabashir@gcu.edu.pk
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Abstract

The influence of nature and pressure of ambient environment on the surface modification, plasma parameters, hardness, and corrosion resistance of Mg-alloy has been investigated. Nd: YAG laser (1064 nm, 10 ns, 25 mJ) at a fluence of 1.3 J cm−2 has been employed as an irradiation source. Targets of Mg-alloy were exposed in the ambient environments of argon (Ar), neon (Ne), and helium (He) at pressures ranging from 5 to 760 Torr. Scanning electron microscope has been employed to investigate the surface morphology of the irradiated targets. It reveals the formation of cavities, cones, droplets, ripples, and islands on the surface of the irradiated sample. Laser-induced breakdown spectroscopy technique was employed to measure electron temperature (Te) and electron number density (Ne) of Mg-alloy. The value of electron temperature ranges from 6628 to 12,855 K, whereas the value of electron number density varies from 5.4 × 1017 to 19.2 × 1017 cm−3. The maximum Te and Ne are observed in Ar and minimum in case of He. It was also revealed that both the surface morphology and plasma parameters are strongly dependent upon nature and pressure of environmental gases. The maxima of Te is achieved at a pressure of 10 Torr for all the three ambient environments that is, Ar, Ne, and He; whereas maxima of Ne is achieved at different pressures, that is, at 760 Torr for Ar, at 200 Torr for Ne, and at 50 Torr for He. The hardness and corrosion resistance of irradiated Mg-alloy have been explored using Vickers Micro-hardness tester and Potentio-dynamic polarization technique, respectively. It was investigated that as compared with un-irradiated target, the hardness as well as corrosion resistance of the laser-irradiated target has been increased significantly in all environments. Plasma parameters, mechanical, and electrical properties of laser-irradiated Mg-alloy have been correlated with induced surface modifications and are strongly influenced by environmental conditions.

Keywords

Electron densityElectron temperatureLaser-induced breakdown spectroscopyMg-alloySurface structuring
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 2 , June 2015 , pp. 315 - 330
Copyright
Copyright © Cambridge University Press 2015 

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