Laser surface alloying of magnesium base alloys

Galun, R.; Weisheit, Andreas; Mordike, B. L.

doi:10.2351/1.4745436

Cited by 39 publications

(31 citation statements)

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“…39 LSA with Al and Ni showed better corrosion resistance. Such an improvement was not observed when copper was laser alloyed on Mg substrate.…”

Section: Corrosion Resistancementioning

confidence: 99%

“…39 They used both one-step (direct powder injection) and two-step (preplacement of alloying element using organic binder followed by LSM) processes to alloy the surfaces of Mg and alloy substrates using different alloying elements and their combinations (Al, Cu, Ni, Si, Al + Cu, Al + Ni, and Al + Si using one-step process, and Sn, Pb, and Zn using two-step process). The results of these LSA experiments are presented in Table II.…”

Section: Microstructure Analysismentioning

confidence: 99%

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Laser Surface Engineering of Magnesium Alloys: A Review

Singh

Harimkar

2012

JOM

125

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Magnesium (Mg) and its alloys are well known for their high specific strength and low density. However, widespread applications of Mg alloys in structural components are impeded by their insufficient wear and corrosion resistance. Various surface engineering approaches, including electrochemical processes (plating, conversion coatings, hydriding, and anodizing), gas-phase deposition (thermal spray, chemical vapor deposition, physical vapor deposition, diamond-like coatings, diffusion coatings, and ion implantation), and organic polymer coatings (painting and powder coating), have been used to improve the surface properties of Mg and its alloys. Recently, laser surface engineering approaches are attracting significant attention because of the wide range of possibilities in achieving the desired microstructural and compositional modifications through a range of laser-material interactions (surface melting, shock peening, and ablation). This article presents a review of various laser surface engineering approaches such as laser surface melting, laser surface alloying, laser surface cladding, laser composite surfacing, and laser shock peening used for surface modification of Mg alloys. The laser-material interactions, microstructural/compositional changes, and properties development (mostly corrosion and wear resistance) accompanied with each of these approaches are reviewed.

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“…39 LSA with Al and Ni showed better corrosion resistance. Such an improvement was not observed when copper was laser alloyed on Mg substrate.…”

Section: Corrosion Resistancementioning

confidence: 99%

Section: Microstructure Analysismentioning

confidence: 99%

Laser Surface Engineering of Magnesium Alloys: A Review

Singh

Harimkar

2012

JOM

125

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“…However, the poor corrosion resistance of magnesium alloys restricts their increasing applications. Magnesium and its alloys are very susceptible to galvanic corrosion, which can result in severe pitting, particularly in wet and salty environments [3,4]. The coating of materials is a highly effective way of preventing corrosion.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and corrosion characteristics of laser-alloyed magnesium alloy AZ91D with Al–Si powder

Qian

Jin

2008

Science and Technology of Advanced Materials

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Blown-powder laser surface alloying was performed on the magnesium alloy AZ91D with Al-Si alloy powder to improve corrosion resistance. Characterization by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD) analysis revealed that intermetallic compounds (IMCs) of Mg 2 Si, Al 12 Mg 17 and Al 3 Mg 2 were formed in the matrix of α-Mg and Al solid solutions in Al-Si alloyed layers. The anodic polarization test in 3.5% NaCl aqueous solution showed that preferential corrosion occurred in the α-Mg matrix of the AZ91D base metal. The Al-Si alloyed layers exhibited a lower corrosion rate and a higher polarization resistance than AZ91D. The compactly dispersed dendritic Mg 2 Si phase, and the dendritic and angular phases of Al 12 Mg 17 and Al 3 Mg 2 in the alloyed microstructure were observed to be corrosion-resistant, constituting a barrier that retards corrosion. Corrosion initiated at the interface between IMCs and the solid solution matrix, and at substructures of the matrix, subsequently pervaded into the surrounding microstructure.

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“…As the material resolidified at a high cooling rate, intermetallic phases were formed which improved the wear resistance. Laser alloying was also applied successfully but was not found suitable for large surfaces due to shrinkage cracking [23]. Laser clads for cylinder liners were produced on magnesium base alloys using 10 kW CO 2 laser and powder mixtures composed of Al + Cu, Al + Si and an alloyed Al-Si powder in the single step.…”

Section: Different Surface Treatments Of Magnesium Alloysmentioning

confidence: 99%

Surface Treatment of Magnesium Alloys by Electroless Ni –P Plating Technique with Emphasis on Zinc Pre-Treatment: A Review

Mahallawy

2008

KEM

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Magnesium alloys are attractive alloys in industrial applications , where light weight and good strength structures are required. Magnesium alloys are versatile and include both cast and wrought alloys. However, they have a drawback as they are prone to corrosion especially in harsh environments. For this reason, surface treatment of magnesium alloys is of prime importance for improving their corrosion characteristics.In the present paper, a survey of the different methods for surface treatment of magnesium alloys is presented and discussed. This is followed by a review of the recent work on electroless Ni plating technique with zinc pre-treatment applied on several magnesium alloys and the effect of pretreatment and post heat treatment on the coat characteristics. The surface morphology, surface roughness, thickness of the layer, EDX analysis, adhesion, hardness and corrosion resistance are covered in this review.

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Laser surface alloying of magnesium base alloys

Cited by 39 publications

References 0 publications

Laser Surface Engineering of Magnesium Alloys: A Review

Laser Surface Engineering of Magnesium Alloys: A Review

Microstructure and corrosion characteristics of laser-alloyed magnesium alloy AZ91D with Al–Si powder

Surface Treatment of Magnesium Alloys by Electroless Ni –P Plating Technique with Emphasis on Zinc Pre-Treatment: A Review

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