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Enhancement of the wear resistance and microhardness of aluminum alloy by Nd:YaG laser treatment.

Hussein HT, Kadhim A, Al-Amiery AA, Kadhum AA, Mohamad AB - ScientificWorldJournal (2014)

Bottom Line: The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm.All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray fluorescence analysis (EDS), optical microscopy, and Vickers hardness.The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4:1.

View Article: PubMed Central - PubMed

Affiliation: Applied Science Department, University of Technology, Baghdad 10066, Iraq.

ABSTRACT
Influence of laser treatment on mechanical properties, wear resistance, and Vickers hardness of aluminum alloy was studied. The specimens were treated by using Nd:YaG laser of energy 780 mj, wavelength 512 nm, and duration time 8 ns. The wear behavior of the specimens was studied for all specimens before and after treatment by Nd:YaG laser and the dry wear experiments were carried out by sing pinon-disc technique. The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm. All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray fluorescence analysis (EDS), optical microscopy, and Vickers hardness. The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4:1. The results showed that the values of wear rate for samples having circular grooves are less than samples without grooves after laser treatment.

Show MeSH
SEM test for aluminum alloy samples: (a) after laser treatment and before wear test and (b) after laser treatment and after wear test.
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Related In: Results  -  Collection


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fig7: SEM test for aluminum alloy samples: (a) after laser treatment and before wear test and (b) after laser treatment and after wear test.

Mentions: The surface morphology of aluminum alloy samples was conducted by using SEM technique as shown in Figures 6 and 7. One can notice the differences between the surface samples before and after wear tests. These differences are due to plastic deformation of the surfaces before and after laser treatment. The interpretation of this behavior related to the plasma is an outcome of the gas phase, which absorbs the energy directly from the laser radiation and from the reflection of the material surface. The plasma causes a shock wave by its expansion and this expansion increased by water pressure that covered the sample. For this reason the hardening was increased and grain size decreased.


Enhancement of the wear resistance and microhardness of aluminum alloy by Nd:YaG laser treatment.

Hussein HT, Kadhim A, Al-Amiery AA, Kadhum AA, Mohamad AB - ScientificWorldJournal (2014)

SEM test for aluminum alloy samples: (a) after laser treatment and before wear test and (b) after laser treatment and after wear test.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4127256&req=5

fig7: SEM test for aluminum alloy samples: (a) after laser treatment and before wear test and (b) after laser treatment and after wear test.
Mentions: The surface morphology of aluminum alloy samples was conducted by using SEM technique as shown in Figures 6 and 7. One can notice the differences between the surface samples before and after wear tests. These differences are due to plastic deformation of the surfaces before and after laser treatment. The interpretation of this behavior related to the plasma is an outcome of the gas phase, which absorbs the energy directly from the laser radiation and from the reflection of the material surface. The plasma causes a shock wave by its expansion and this expansion increased by water pressure that covered the sample. For this reason the hardening was increased and grain size decreased.

Bottom Line: The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm.All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray fluorescence analysis (EDS), optical microscopy, and Vickers hardness.The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4:1.

View Article: PubMed Central - PubMed

Affiliation: Applied Science Department, University of Technology, Baghdad 10066, Iraq.

ABSTRACT
Influence of laser treatment on mechanical properties, wear resistance, and Vickers hardness of aluminum alloy was studied. The specimens were treated by using Nd:YaG laser of energy 780 mj, wavelength 512 nm, and duration time 8 ns. The wear behavior of the specimens was studied for all specimens before and after treatment by Nd:YaG laser and the dry wear experiments were carried out by sing pinon-disc technique. The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm. All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray fluorescence analysis (EDS), optical microscopy, and Vickers hardness. The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4:1. The results showed that the values of wear rate for samples having circular grooves are less than samples without grooves after laser treatment.

Show MeSH