Gas-tungsten arc welding of AZ91 magnesium alloy

Braszczyńska-Malik, K. N.; Mróz, M.

doi:10.1016/j.jallcom.2011.07.105

Cited by 37 publications

(24 citation statements)

References 29 publications

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“…Due to the presence of zinc in the chemical composition of the AZ91 alloy, a ternary intermetallic compound Mg 17 Al 11.5 Zn 0.5 or Mg 17 (Al,Zn) 12 type was created because zinc substitutes aluminum in the c phase. [29,30] Additionally, the c phase in the form of secondary discontinuous precipitates was revealed in the microstructure of both fabricated composites. A characteristic lamellar structure with a marked anisotropy of growth of a plate-like c phase, located especially near the a + c eutectic was visible in the microstructure of both composites (Figures 5 and 6).…”

Section: Resultsmentioning

confidence: 99%

The Role of Ni-P Coating Structure on Fly Ash Cenospheres in the Formation of Magnesium Matrix Composites

Braszczyńska-Malik

Kamieniak

2017

Metall Mater Trans A

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The role of the Ni-P coating structure on fly ash cenospheres in the fabrication of magnesium matrix composites has been investigated. Two composites based on AZ91 commercial magnesium alloys with hollow aluminosilicate cenospheres were fabricated by the negative pressure infiltration technique. Two kinds of cenospheres (i.e., as Ni-P coated and after heat treatment) were used in order to determine the influence of the Ni-P coating structure on creating interfaces between the components. Microstructure analyses were carried out by light microscopy, atomic force microscopy, XRD, scanning, and transmission electron microscopy. Al 3 Ni 2 and Mg 2 Ni intermetallic phases at the component interfaces were formed in the composite with as-received Ni-P-coated cenospheres. After heat treatment of the Ni-P-coated cenospheres, NiO was created outside the external layer of the Ni-P coatings and this oxide remained stable at the component interfaces during composite fabrication. In both cases, the Ni-P coating prevented the reaction between the cenosphere walls and the magnesium matrix alloy, which contributed to obtaining intact cenospheres, unfilled by the matrix alloy.

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Section: Resultsmentioning

confidence: 99%

The Role of Ni-P Coating Structure on Fly Ash Cenospheres in the Formation of Magnesium Matrix Composites

Braszczyńska-Malik

Kamieniak

2017

Metall Mater Trans A

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“…of welding equipment, the facility of process implementation, and the low cost of equipment and supplies, the GTAW method seems to be an interesting alternative to laser, plasma, or electron beam techniques. The effectiveness of the GTAW method in the process of modification of the surface layer has been confirmed in, among others, [8][9][10][11]. However, the GTAW technique is rarely used in surface engineering.…”

mentioning

confidence: 92%

“…The effectiveness of the GTAW method in the process of modification of the surface layer has been confirmed in, among others, [8][9][10][11]. However, the GTAW technique is rarely used in surface engineering.…”

mentioning

confidence: 92%

Surface modification of ZrO2-10 wt. % CaO plasma sprayed coating

Iwaszko

Kudła

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Oxide ZrO 2 -CaO plasma-sprayed coatings were remelted using the modified gas tungsten arc welding (GTAW) method. The original two-burner set, generating a free independent arc, was used in the treatment. The samples were subjected to structural examination using light and scanning electron microscopes, and energy-dispersive X-ray microanalysis (EDX). A substantial heterogeneity of the plasma-sprayed coatings was found, observable with a laminar structure, significant porosity, and step change in the concentration of the elements. Significant changes in the structure were found after the remelting treatment. Both microscopic and EDX investigations showed that the treatment leads to a reduction in the heterogeneity of the chemical composition of the coating material and to a loss of structural characteristics typical for plasma-sprayed coatings.Key words: remelting treatment, GTAW method, oxide coating. of welding equipment, the facility of process implementation, and the low cost of equipment and supplies, the GTAW method seems to be an interesting alternative to laser, plasma, or electron beam techniques. The effectiveness of the GTAW method in the process of modification of the surface layer has been confirmed in, among others, [8][9][10][11]. However, the GTAW technique is rarely used in surface engineering. This is partly due to common beliefs and stereotypes, according to which, welding methods are useful only in cases of joining of materials. It is true that the implementation of welding techniques in the surface layer modification process of some materials is connected with the necessity of solving methodical problems resulting from the physicochemical and thermoelectric properties of the remelting material. This is due to the fact that in the GTAW method the electric arc burns between an infusible electrode and a remelting surface. Therefore, in the case of the material being an insulator and the arc ignition and its stabilisation being hindered or impossible, the surface remelting processing requires a modification of the welding stand and the remelting methodology itself. This study contains an example of the solution, which enables one to overcome such methodological and instrumentation problems occurring during the remelting treatment of non-conductive, plasma-sprayed coatings. The methods of thermal spraying, which are representative of plasma spraying, give rise to the possibility of application of a wide range of coating materials to metallic, ceramic, and even polymeric substrates [12,13]. The significance of application of sprayed coatings is unquestionable. However, due to the substantial porosity, heterogeneity, and the laminar nature of the structure of thermally-spread coatings, more and more often, additional treatment modifying the structure and properties of those coatings is carried out [14][15][16][17]. As a part of this study, a remelting treatment of ZrO 2 -CaO oxide plas-

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“…There are many researches related to the welding ability of Mg alloys, especially for AZ91 alloys, in the literature. The AZ91 alloy can be welded either by fusion welding techniques such as laser welding [3,4], MIG welding [5], TIG welding [6][7][8], or solid-state welding techniques for example diffusion welding [9], resistance spot welding [10,11], friction stir welding [2,12], and friction stir spot welding [13,14].…”

Section: Introductionmentioning

confidence: 99%

The effects of the welding parameters on the microstructure and mechanical properties of the friction welded AZ91 Mg alloy.

Çelikyürek¹,

Önal²

2016

AUBTD-A

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The AZ91T5 Mg alloy was bonded by applying continuous drive friction welding machine. The friction load, time and speed were used as friction welding parameters, and the effects of these parameters on the microstructure and mechanical properties of the welding interface were investigated. Characterization of welding interface microstructure and fractured surfaces of joints was carried out by optical microscopy and scanning electron microscopy. Microstructural investigations revealed that the welding interfaces have a smooth and continues morphology. The micro hardness and shear strength of matrix and the welding interfaces were measured in order to determine the mechanical properties of the joints. The results showed that the welding interfaces have higher hardness than the matrix and the shear strengths of welding interfaces increased with increasing pressure and speed while time has different effect.

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Gas-tungsten arc welding of AZ91 magnesium alloy

Cited by 37 publications

References 29 publications

The Role of Ni-P Coating Structure on Fly Ash Cenospheres in the Formation of Magnesium Matrix Composites

The Role of Ni-P Coating Structure on Fly Ash Cenospheres in the Formation of Magnesium Matrix Composites

Surface modification of ZrO2-10 wt. % CaO plasma sprayed coating

The effects of the welding parameters on the microstructure and mechanical properties of the friction welded AZ91 Mg alloy.

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