Mg-Al-RE Magnesium Alloys for High-Pressure Die-Casting

Braszczyńska-Malik, K. N.

doi:10.2478/afe-2014-0035

Cited by 8 publications

(9 citation statements)

References 13 publications

(21 reference statements)

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“…These were observed locally at the boundaries of the solid solution grains, which indicates that, during the thermochemical treatment process, part of the Mg 17 Al 12 phase dissolved into the matrix. The literature data show that the solid solution areas in as-cast AZ91 may contain 2.9 at.% or 4.5 at.% aluminium [44,45]. In this study, the concentration of aluminium in the solid solution area of the AZ91 substrate was reported to be higher and a small amount of zinc was detected (quantitative analysis at a point located in the solid solution area: 6.54 at.% aluminium and 0.34 at.% zinc).…”

Section: Resultsmentioning

confidence: 99%

Surface alloying of magnesium and AZ91 by thermochemical treatment in a medium containing zinc chloride and potassium chloride

Mola

Bucki

Gwoździk

2018

Materialwissenschaft Werkst

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Surface layers enriched with zinc were formed on pure magnesium and AZ91 alloy by heating the specimens in contact with paste containing zinc chloride and potassium chloride at 440 °C for 2 h, using no protective atmosphere. The study involved determining the microstructure, phase composition and microhardness of the resulting layers. During the layer formation process, a transient liquid phase occurred at the substrate/paste interface. The layers fabricated on both substrates were about 200 μm in thickness and they were metallurgically bonded to the substrate material. The same process conditions were used for both types of substrates. From the experimental data it is clear that the layer fabricated on magnesium differed in microstructure from that formed on AZ91. The alloyed layer on magnesium was characterised by dendrites of a solid solution of zinc in magnesium surrounded by a lamellar eutectoid structure composed of an MgZn intermetallic phase and a solid solution of zinc in magnesium. In the layer formed on AZ91, aluminium was detected in all the structural constituents. The layer was composed of a solid solution of zinc and aluminium in magnesium and Mg17(Al, Zn)12 and Mg5Al2Zn2 intermetallic phases. The alloyed layers had much higher hardness than the substrate materials.

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Section: Resultsmentioning

confidence: 99%

Surface alloying of magnesium and AZ91 by thermochemical treatment in a medium containing zinc chloride and potassium chloride

Mola

Bucki

Gwoździk

2018

Materialwissenschaft Werkst

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“…There is a wide range of suggested process parameters for die casting of different Mg alloys in the literature [3][4][5][6]. This paper specifies optimum process parameters for better mechanical and metallurgical properties * corresponding author; e-mail: svanli@yildiz.edu.tr of the casting parts, obtained experimentally.…”

Section: Introductionmentioning

confidence: 99%

Process Optimization and Surface Modification of Die Casting AZ91 Magnesium Alloy Products

2018

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This work includes optimization of the AZ91 magnesium alloy cold chamber die casting process by experiments conducted according to the Taguchi experimental technique, to find the effective process parameters which determine the mechanical and metallurgical properties of the casting products. Optimum process parameters determined according to the test results are 660 • C for bath temperature; 200/250 • C for die temperature; 0.30 vol.% for protective gas concentration; 120 MPa for intensification pressure and 30 ms −1 for gate velocity. These parameters result in minimum porosity formation which provides high mechanical strength and density and good metallurgical properties. AZ91 alloy samples manufactured with the optimum process parameters show dimensional tolerances of ±0.04 mm, density of 1.78 gcm −3 , less than 2% porosity in average, maximum yield strength of 157 MPa and ultimate tensile strength of 248 MPa and maximum elongation of 7.67% in a 50 mm sample. Finally, surface modification of Mg die casting parts is crucial for meeting the long term usage requirements of the consumers. The electroless/electro nickel-plating with appropriate baths and pre-treatment processes were applied for providing fine surface conditions. The most effective process and modification parameters were analyzed in this study by considering the product quality.

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“…As seen in Figure 3, the mixed L8 (27) orthogonal array has been selected [28,29]. First column was assigned to holding time (factor A); second column to alloy type (factor B), third column was grain refinement master alloy addition (factor C); fourth column was modifier (factor D); and the last column was set to casting temperature (factor E).…”

Section: Experimental Designmentioning

confidence: 99%

Taguchi Approach for Optimization of Parameters that Effect Grain Size of Cast A357 Alloy

Çolak¹,

Dışpınar²

2017

Archives of Foundry Engineering

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Grain refining and modification are common foundry practice for improving properties of cast Al-Si alloys. In general, these types of treatments provide better fluidity, decreased porosity, higher yield strength and ductility. However, in practice, there are still some discrepancies on the reproducibility of the results from grain refining and effect of the refiner's additions. Several factors include the fading effect of grain refinement and modifiers, inhomogeneous dendritic structure and non-uniform eutectic modification. In this study, standard ALCAN test was used by considering Taguchi's experimental design techniques to evaluate grain refinement and modification efficiency. The effects of five casting parameters on the grain size have been investigated for A357 casting alloy. The results showed that the addition of the grain refiner was the most effective factor on the grain size. It was found that holding time, casting temperature, alloy type and modification with Sr were less effective over grain refinement.

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Mg-Al-RE Magnesium Alloys for High-Pressure Die-Casting

Cited by 8 publications

References 13 publications

Surface alloying of magnesium and AZ91 by thermochemical treatment in a medium containing zinc chloride and potassium chloride

Surface alloying of magnesium and AZ91 by thermochemical treatment in a medium containing zinc chloride and potassium chloride

Process Optimization and Surface Modification of Die Casting AZ91 Magnesium Alloy Products

Taguchi Approach for Optimization of Parameters that Effect Grain Size of Cast A357 Alloy

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