Investigation on reactive wetting during investment casting of magnesium alloy AZ91

Vyas, Akash; Ayar, V. S.; Sutaria, M. P.

doi:10.1016/j.matpr.2020.02.521

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…From the environmental point of view, greenhouse emissions of the gases and fluxes used during melting and handling of magnesium should be less. The geometrical aspect such as a thin wall or thick wall casting as well as a selection of face-coat materials, mold surface finish, mold permeability, and strength during mold development should be considered [4][5][6]. During fettling and finishing, care should be taken to prevent the burning of chips and fins.…”

Section: Fig 3 a Road Map For Future Magnesium Foundry Journeymentioning

confidence: 99%

Archives of Foundry Engineering

Vyas,

Sutaria

2022

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In the manufacturing sector, the processing of magnesium alloys through the liquid casting route is one of the promising methods to manufacture automotive and aircraft components, for their excellent mechanical properties at the lower weight. Investment casting process has the great cabaility to produce near net shape complex castings for automotive and aircraft applications. The distinct and attractive engineering properties of magnesium alloys have shown to be promising in terms of its potential to replace materials such as cast iron, steel, and aluminum In this regard, the efforts to develop processing technology for these alloys for their wide range of applications in industries have been reported by the scientific and engineering community. For successful production of magnesium alloy castings, it requires specialized foundry techniques because of the particular chemical and physical properties of magnesium; especially the reactive and oxidative nature of these alloys. The industry is young enough, to tap the potential.

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Section: Fig 3 a Road Map For Future Magnesium Foundry Journeymentioning

confidence: 99%

Archives of Foundry Engineering

Vyas,

Sutaria

2022

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“…Meanwhile, other refractories such as MgO, CaO, and Y 2 O 3 have a high chemical stability with the magnesium alloy. However, MgO and CaO are prone to moisture absorption, making them difficult to promote [20][21][22]. Y 2 O 3 is very expensive, and the prepared slurry is difficult to preserve for a long time.…”

Section: Introductionmentioning

confidence: 99%

Effects of Mold Materials on the Interfacial Reaction between Magnesium Alloy and Ceramic Shell Mold during Investment Casting

Y.Hao

Liu

et al. 2020

Metals

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In order to suppress the interfacial reaction between the ceramic shell mold and the magnesium molten alloy during the investment casting process, a mold material with a high thermodynamic stability based on alkaline zirconium sol (CH4NO3Zr) binder and corundum (Al2O3) powder was prepared. The effects of the mold materials and casting thicknesses on the interfacial reaction were investigated by an optical microscope, X-ray diffraction, a scanning electron microscope, and an energy dispersive spectroscope analysis. The results suggested that the casting poured by the conventional ZrSiO4 mold has a serious reaction on the surface, and the reaction was more severe when the casting thickness was increased. The oxidation layer was approximately 300 μm in some severe areas of 45 mm thickness. The XRD and EDS results showed that the reaction interface mainly contains MgO and Mg2Si. While the casting poured by the Al2O3 mold provides a light and smooth surface, the reaction layer was only 1.5 μm on average. The reaction interface mainly contains MgO and Mg2F.

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“…The application of various face-coat oxides Al 2 O 3 , Y 2 O 3 , MgO etc. were observed as significant for suppressing the reactions to some extent [5][6][7][8][9]. The effectiveness of various protective gases to inhibit reactions and oxidation of Mg AZ91 melt were studied by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Vyas,

Sutaria

2020

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The magnesium alloy investment castings have greater potential for automobile and air-craft applications due to the higher strength to weight ratio of magnesium alloys and capability of the investment casting process to produce near net shape complex castings. The interfacial-mould metal reactions during investment casting of magnesium alloy inhibit successful production of quality castings. This paper presents the investigation done on the reactions at corners of AZ91 magnesium alloy cast part produced through investment casting. The stepped shape geometry of casting was selected to study the reactions at convex and concave corners of the cast part. The reacted surfaces were characterised using the SEM-EDX and XRD. The formation of oxides was observed on cast surface from characterisation. The temperature profile recorded at corners were helpful to understand the heat dissipation during the solidification of metal at corners. It was observed that the reactions occurred at the concave corner were more as compared to the convex corner of the cast part.

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Investigation on reactive wetting during investment casting of magnesium alloy AZ91

Cited by 8 publications

References 13 publications

Archives of Foundry Engineering

Archives of Foundry Engineering

Effects of Mold Materials on the Interfacial Reaction between Magnesium Alloy and Ceramic Shell Mold during Investment Casting

Archives of Foundry Engineering

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