Utility of micro-indentation technique for characterization of the constitutive behavior of skin and interior microstructures of die-cast magnesium alloys

Shan, Zhaohui; Gokhale, A.M.

doi:10.1016/s0921-5093(03)00529-x

Cited by 43 publications

(15 citation statements)

References 16 publications

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“…We believe that the strong effect of the side surfaces on the corrosion process of MRI 201S alloy can be explained by the difference of the microstructures between the flat surfaces of the die-cast sheets and the inner part of the sheets exposed when the large sheet are cut into smaller plates. In fact, this is the 'skin-effect' described previously in the literature for other High Density Die Cast magnesium alloys [12][13][14].…”

Section: Resultssupporting

confidence: 63%

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The effect of the local microstructure of MRI 201S magnesium alloy on its corrosion rate

et al. 2015

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Section: Resultssupporting

confidence: 63%

“…1 similar 'skin effect' was reported for other die-cast alloys [12][13][14]. We decided to study the 'side surface effect' on the corrosion rate of the High Density Die-Cast MRI 201S magnesium alloy as compared to other MRI series alloys in more detail and report here the first results of this study.…”

Section: Introductionsupporting

confidence: 57%

The effect of the local microstructure of MRI 201S magnesium alloy on its corrosion rate

et al. 2015

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“…[7,26,27] Although it currently has no universal definition, [8,17] the skin is usually free of porosity and harder than more central regions, and can be up to several hundred micrometers thick. [7,17,24,25] Some authors have defined the skin as the region outside the defect band.…”

Section: Defect Bands and The Hpdc Skinmentioning

confidence: 99%

Defect Band Characteristics in Mg-Al and Al-Si High-Pressure Die Castings

Gourlay

Laukli

Dahle

2007

Metall Mater Trans A

123

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Bands of positive macrosegregation and porosity commonly follow the surface contour of components produced by high-pressure die casting (HPDC). In this article, Al alloy AlSi7Mg and Mg alloys AZ91 and AM60 were cast into tensile test bars using cold-chamber (cc) HPDC. Microstructural characterization revealed that externally solidified crystals (ESCs) are not necessary for defect band formation, and that defect bands can form both near to and relatively far from any surface layer of different microstructure. The defect bands were 140 to 240 lm thick. In addition to defect-band-related macrosegregation, the castings also contained inverse segregation and surface segregation. Defect bands are shown to have the characteristics of the dilatant shear bands reported in past rheology studies, indicating that defect bands form due to strain localization in partially solid material during the HPDC process.

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“…This procedure has the potential to evaluate the damage progress in materials in order to predict the variability in the mechanical properties of pressure die-cast Mg-alloys. The real and simulated microstructures were meshed with linear triangular elements by using Object Oriented Finite element (OOF) software [6] while adaptive mesh routines were used to conform the element edges to the phase boundaries and to refine the element size and the reported microscale constitutive properties by Shan and Gokhale [7] on the same material that was used in this study. These microscale constitutive properties have also been used as input properties for unbiased simulations that were not influenced by the presence of porosity.…”

Section: Simulation Of Mechanical Properties Of Simulated Microstructmentioning

confidence: 99%

Prediction of tensile variability by simulations of microstructures having controlled variations of porosity in Mg-alloy pressure die-castings

Lee

2009

Met. Mater. Int.

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The spatial arrangement and heterogeneity of microstructural features, in particular, porosity in the cast microstructures, adversely affect the mechanical properties, and consequently lead to significant variability in the properties. Clearly, successful applications of cast alloys require production of castings that exhibit reproducible mechanical responses and low variability in the properties. Therefore, it is essential to thoroughly understand how the spatial arrangement and heterogeneity of porosity govern the mechanical properties. In this respect, new techniques that can simulate the microstructures with different degrees of spatial clustering and arrangement of porosity are presented. New parameters to describe different degrees of microstructural simulations were developed and corresponding virtual 2D microstructures were created. The simulated microstructures were implemented in a Finite Elements (FE) framework in order to study and predict the mechanical properties, which show a good agreement with the experiments.

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Utility of micro-indentation technique for characterization of the constitutive behavior of skin and interior microstructures of die-cast magnesium alloys

Cited by 43 publications

References 16 publications

The effect of the local microstructure of MRI 201S magnesium alloy on its corrosion rate

The effect of the local microstructure of MRI 201S magnesium alloy on its corrosion rate

Defect Band Characteristics in Mg-Al and Al-Si High-Pressure Die Castings

Prediction of tensile variability by simulations of microstructures having controlled variations of porosity in Mg-alloy pressure die-castings

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