Study on feasibility of producing an amorphous surface layer of Fe49Cr18Mo7B16C4Nb3 by pulsed Nd:YAG laser surface melting

2013 ◽  
Vol 264 ◽  
pp. 176-183 ◽  
Author(s):  
Reza Mojaver ◽  
Faezeh Mojtahedi ◽  
Hamid Reza Shahverdi ◽  
Mohammad Javad Torkamany
Keyword(s):  
Surface Layer ◽  
Nd:Yag Laser ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Pulsed Nd:Yag Laser ◽  
Amorphous Surface

Development of Nano-Structured Aluminum Surfaces by LSM

2008 ◽  
Author(s):  
Taha Mattar ◽  
Ehab Abdel Rahman ◽  
Ahmed Abdel-Aziz ◽  
Haytham El-Gazzar
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Surface Structure ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Aluminum Surface ◽  
Yag Laser ◽  
Structured Surface ◽  
Aluminum Surfaces

Aluminum is one of most common metals in all advanced and modern scientific and technological applications including electrical, electronic, chemical, engineering, energy and medical fields. The performance of aluminum alloys determines to large extent the quality and economic status of the different processes. Aluminum surface structure determine its performance where nano sized grains and layer can improve aluminum properties and performance. In this work, the improvement of aluminum surface structure and formation of nano structured surface grains by laser surface melting (LSM) using Nd-YAG laser under argon atmosphere was investigated. Different power and scanning speed were applied. The physical and chemical properties of the produced surfaces were examined. SEM, EDX and XRD analyses were performed and were correlated to hardness results. Corrosion resistance of the treated surface was investigated to evaluate their performance in aggressive media and chemical and medical applications. From the obtained data it can be concluded that Nd-YAG laser surface melting of aluminum results in formation of 750 micron nano-structured surface layer. Adjustment of LSM parameters could produce 100 nm grains or less. The obtained results showed also that LSM under argon can eliminate the formation of Al2O3 surface layer which may deteriorates the performance in certain applications. Surface layer rich in AlN is formed upon LSM. It was concluded also that corrosion resistance of the treated aluminum surfaces was improved to large extent by LSM.

Defects in Laser Surface-Melted Metals Studied by Pac

1986 ◽  
Vol 82 ◽  
Author(s):  
Gary S. Collins ◽  
Carl Aliard ◽  
Christoph Hohenemser ◽  
Clifton W. Draper
Keyword(s):  
Surface Layer ◽  
Low Temperatures ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Pipe Diffusion ◽  
Nanosecond Duration ◽  
Angular Correlations ◽  
Vacancy Clusters ◽  
Lattice Locations

ABSTRACTFollowing nanosecond-duration laser surface-melting, lattice locations of illIn probe atoms in Ni and Pt samples were studied using the technique of perturbed gamma-gamma angular correlations (PAC). After melting and annealing, no probe atoms were observed to become associated with unique vacancy clusters observed after other methods of damaging, while many probe atoms were found on non-unique sites. 111In probe atoms were observed to move to the surface and to be expelled at anomalously low temperatures. These observations are partially reconciled by the hypothesis that probe atoms diffusing in the molten surface layer become trapped on dislocations during resolidification, and during later annealing return to the surface via pipe diffusion.

The Effects of Nd:YAG Laser Surface Melting Parameters on the Solidification Behavior of Aluminium Surface

2012 ◽  
Vol 1 (3) ◽  
pp. 239-244
Author(s):  
P. Omranian ◽  
H. R. Shahverdi ◽  
M. J. Torkamany ◽  
S. A. Vaziri
Keyword(s):  
Nd:Yag Laser ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Solidification Behavior
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