Quasi-continuous-wave laser surface melting of aluminium alloy: Precipitate morphology, solute segregation and corrosion resistance

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.

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Influences of laser surface melting on microstructure, mechanical properties and corrosion resistance of dual-phase Cr–Fe–Co–Ni–Al high entropy alloys

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.154100 ◽

2020 ◽

Vol 826 ◽

pp. 154100 ◽

Cited By ~ 1

Author(s):

Chen Chen ◽

Hang Zhang ◽

Suxin Hu ◽

Ran Wei ◽

Tan Wang ◽

...

Keyword(s):

Mechanical Properties ◽

Corrosion Resistance ◽

Surface Melting ◽

Laser Surface ◽

Laser Surface Melting ◽

Dual Phase ◽

High Entropy Alloys ◽

High Entropy ◽

Mechanical Properties And Corrosion

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Influence of Laser Surface Melting Condition on Intergranular Corrosion Resistance in Type 316 Stainless Steel

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet.73.340 ◽

2009 ◽

Vol 73 (5) ◽

pp. 340-345

Author(s):

Kenji Muto ◽

Masahide Furukawa ◽

Jun'ichi Sakai ◽

Makoto Yoshida

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Intergranular Corrosion ◽

Surface Melting ◽

Laser Surface ◽

Laser Surface Melting ◽

316 Stainless Steel ◽

Melting Condition ◽

Intergranular Corrosion Resistance

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Effect of CO2 Laser Surface Melting on the Microstructure of AZ91D Magnesium Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.464.461 ◽

2011 ◽

Vol 464 ◽

pp. 461-464

Author(s):

Ju Fang Chen ◽

Xing Cheng Li ◽

Jiang Tao Wang ◽

Wei Ning Lei

Keyword(s):

Grain Size ◽

Magnesium Alloy ◽

Continuous Wave ◽

Surface Melting ◽

Laser Surface ◽

Laser Surface Melting ◽

Micro Hardness ◽

Az91d Magnesium Alloy ◽

Average Grain Size ◽

Melted Layer

In the present study, the effect of laser surface melting (LSM) on microstructure of AZ91D magnesium alloy was investigated with a 2kW continuous wave CO2 laser. The results indicate that both the substrate and laser melted layer mainly consisted of α-Mg and β-Mg17Al12, the amount of β-phase in laser melted layer was decreased as compared to that of the substrate. The microstructure of the laser surface melted zone consists of fine dendrites with an average grain size of less than 10m, the grain size was reduced by a factor of more than 10 times as compared to that of the substrate. The micro-hardness of the melted layer was increased to 70–85HV as compared to that of the substrate (about 53HV). Because of the grain refinement, the enhancement of the hard phase β-Mg17Al12, and the solid solution hardening of alloy elements, the micro-hardness and strength of the laser melted layer was increased significantly.

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