Effect of gravity die casting, squeeze casting and extrusion on microstructure, mechanical properties and corrosion behaviour of AZ91 magnesium alloy

Marodkar, Ankush S.; Patil, Hitesh; Chavhan, Jitendra; Borkar, Hemant

doi:10.1016/j.matpr.2023.03.053

Cited by 8 publications

(3 citation statements)

References 31 publications

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“…An extensive discussion related to both the grain growth and dynamic recrystallization process, which occurred in the SZ, was reported in [45]. Unlike the results published in the literature [46,47], the friction heating developed during the severe plastic deformation does not confer grain refinement in HPDC AZ91 samples (see BM in Figure 5). Nevertheless, a decrement in grain dimensions was observed by increasing the advancing speed from 2500 to 3000 rpm.…”

Section: Resultsmentioning

confidence: 93%

Corrosion Behaviour of High-Pressure Die-Cast AZ91 Alloy in NaCl Solution: Effects of Friction Stir Process at High Rotational Speed

Ghio,

Cerri

2023

Materials

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The AZ series of Mg alloys have become promising in several industrial fields thanks to its potential microstructure refinement and the β-Mg17Al12 eutectic that controls the mechanical behaviour. Simultaneously, the rapid degradation characterizing Mg alloys makes the investigation of their corrosion behaviour necessary. The present work considers high-pressure die cast (HPDC) AZ91 alloy to evaluate its corrosion behaviour in 1M NaCl solution and investigates how different friction stir process parameters can affect the corrosion responses. No studies analyse the effects induced by the friction stir processed zone, reached using high rotational speeds (>2000 rpm), on the unprocessed HPDC AZ91 alloy. In addition, the morphological analysis of the corroded surfaces having a friction stir processed zone, in which the grain refinement was not obtained, is not present in the literature yet. Microstructural features were investigated by optical microscope and X-ray diffraction analysis before and after the friction stir process. These were subsequently correlated to the corrosion responses after the immersion tests. The results show that HPDC samples with a very smooth surface have the best corrosion resistance with a corrosion rate lower than 3 mm/year, evaluated through the weight loss, compared to the rougher ones. Both the amount of β-Mg17Al12 eutectic and the wt.% Al in the α-Mg matrix, as well as the surface roughness, influence the corrosion behaviour of friction stir processed samples. The best corrosion resistance was obtained with an HPDC alloy processed at 2500 rpm and 50 mm/min.

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Section: Resultsmentioning

confidence: 93%

Corrosion Behaviour of High-Pressure Die-Cast AZ91 Alloy in NaCl Solution: Effects of Friction Stir Process at High Rotational Speed

Ghio,

Cerri

2023

Materials

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“…Gravity dies casting is an ideal method for producing high-quality, cost-effective pistons with excellent dimensional accuracy, surface finish, and performance characteristics [2]- [4]. However, in addition to the inherent benefits, various defects such as misrun, shrinkage, inappropriate filling, porosity, blow holes, and pin holes may occur during metal filling and solidification [5], [6]. According to reports, ninety percent of these casting flaws result from improper casting design [7]- [10], which influences mold filling and affects the mechanical properties of the cast pieces [11], [12].…”

Section: Introductionmentioning

confidence: 99%

The Modification of the Runner and Ingate Geometry to eliminate Misrun Defects on the Piston using Gravity Die Casting

Rizkia,

Fernanda Alvi Yasin,

Banowati

et al. 2023

RiESTech

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Piston is an essential component of an engine because it plays a crucial role in the combustion process that drives the motorcycle. Gravity dies casting has become an ideal method for producing pistons owing to its high-quality product, cost-effective with excellent dimensional accuracy, good surface finish, and performance characteristics. However, misrun defect may occur during metal filling and solidification. This study aims to find the suitable dimensions for motorcycle piston products without the presence of misrun using MAGMASoft. The geometry modification introduced in this research are an ingate area of 176, 264, and 352 mm2 as well as the angle of runner of 60, 160, and 180o. Modifying the ingate area to 264 mm2 and the angle of the runner to 160o eliminated the misrun defect in the piston product. This phenomenon results from the laminar flow, higher temperature, and quicker flow velocity of the molten metal as it fills the window (the thinnest part of the piston).

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“…This process helps in decreasing the flaws such as gas porosity, shrinkage porosity, and oxide inclusions in castings [7,8]. In comparison to gravity cast AZ91 alloys, the squeeze cast alloys had stronger resistance to indenter penetration due to the elimination of porosity and an increase in grain boundary density, which resulted in higher hardness values [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ca and Ce Additions on Microstructure and Microhardness of Squeeze-Cast AZ91 Mg Alloy

Sarania,

Marodkar,

Borkar

2023

MSF

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In this study, AZ91 alloy was used as the base material and calcium and cerium were added as alloying elements. Microstructural analysis through optical microscope (OM) and field emission scanning electron microscope (FESEM) revealed that AZ91 base alloy contains α-Mg matrix and β-Mg17Al12 interdendritic network. The inclusion of individual calcium and cerium resulted in a more homogeneous distribution of the interdendritic network in the AZ91-1wt.% Ca and AZ91-1wt.% Ce alloy. The secondary phase (Mg17Al12) was refined in the microstructure as a result of Ca and Ce addition where Ce addition forms a new rod-like phase that is recognized as Al11Ce3 and Ca addition forms a skeleton like structure of Mg17Al12 and Al2Ca. Due to the formation of new Al2Ca and Al11Ce3 intermetallics, the volume fraction of β-Mg17Al12 was more suppressed with Ca and Ce alloy additions. The grain size determined from Electron Backscatter Diffraction (EBSD) maps indicate the reduction in average grain size with individual Ca and Ce additions. The addition of these elements was found to improve the hardness of AZ91 alloy. Overall, the results of this study demonstrate the potential for using Calcium and Cerium as alloying elements in AZ91 alloy to improve its mechanical properties by modifying its microstructure.

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Effect of gravity die casting, squeeze casting and extrusion on microstructure, mechanical properties and corrosion behaviour of AZ91 magnesium alloy

Cited by 8 publications

References 31 publications

Corrosion Behaviour of High-Pressure Die-Cast AZ91 Alloy in NaCl Solution: Effects of Friction Stir Process at High Rotational Speed

Corrosion Behaviour of High-Pressure Die-Cast AZ91 Alloy in NaCl Solution: Effects of Friction Stir Process at High Rotational Speed

The Modification of the Runner and Ingate Geometry to eliminate Misrun Defects on the Piston using Gravity Die Casting

Influence of Ca and Ce Additions on Microstructure and Microhardness of Squeeze-Cast AZ91 Mg Alloy

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