Laser Cladding of Magnesium Alloy Az91d With Silicon Carbide

Abstract

Mg alloys are ultralight but their structural applications are often limited by their poor wear and corrosion resistance. The research aimed to address the problem by laser-cladding. Cladding with SiC powder onto surface of AZ91D was carried out using Nd :YAG laser. The laser-clad surface was analyzed using the optical microscope, SEM equipped with EDS, and XRD and found to contain SiC and other Si compounds such as Mg 2 Si and Al 3.21 Si 0.47 as well as much refined α- Mg grains and β- Mg 17 Al 12 intermetallics. The laser-clad surface possesses considerably higher hardness but its corrosion resistance is not improved, indicating that the laser-cladding technique can only be adopted for applications in noncorrosive environments where wear is the predominant problem.

Darkening effect on AZ31B magnesium alloy surface induced by nanosecond pulse Nd:YAG laser

“…Mg alloys are important engineering materials, and they are widely used in the automobile, communication and aerospace fields due to low density and high specific strength [7][8][9][10]. In order to improve their poor surface-related properties, many experiments have been performed to demonstrate that laser surface treatment can be used to further extend the application of Mg alloy [11][12][13][14][15]. Here we present our work on darkening surface of AZ31B Mg alloy induced by nanosecond pulse Nd:YAG laser irradiation.…”

Effect of Intermetallic β-Mg₁₇Al₁₂ on Fracture of Ultralight Magnesium Alloy

“…Considerable effort has been made in the past decade or so to study casting [1,2,3], welding [4], machining [5,6], heat treatment [7,8], phase transformation [9], surface coating [10,11], and laser processing [11,12,13,14,15,16] of various magnesium alloys, including AM50A [5,17], AM60 [1], AZ31B [18], AZ91D [4,7,8,9,10,11,12,13,14,15,16], and Mg-based composites [19,20]. Effort has also been made to study the materials' corrosion mechanisms [7,18,20,21,22,23], biocorrosion behavior [8,13], wear resistance [24], fatigue properties [25] and fracture under dynamic loading [17].…”

Surface Modification of AZ91D Magnesium Alloy Using Millisecond, Nanosecond and Femtosecond Lasers

“…Laser surface engineering can be used to enhance surface-related properties of metallic alloys without affecting the bulk properties. Previous studies have shown that corrosion and wear resistance of Mg alloy can be improved significantly after laser surface treatment [5][6][7][8][9]. However, not much has been understood on the relationship between laser-Mg alloy interaction and surface microstructure as well as surface properties of the irradiated area.…”