Correlation between Porosity and Fracture Mechanism in High Pressure Die Casting of AM60B Alloy

Li, X.; Xiong, Shengwu; Zhang, Guo

doi:10.1016/j.jmst.2015.10.002

Cited by 72 publications

(14 citation statements)

References 29 publications

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“…The closer the ratio approaches to 1, the less complex the pore. Researchers [20,21] have done statistical studies on the distribution of pores, and classified the pores according to their sphericity and volume. Pores with sphericity less than 0.5 can be regarded as shrinkage pore affected by the liquid feeding.…”

Section: Influence Of Pressure On Pore Typementioning

confidence: 99%

Influence of intensification pressures on pores in die-cast ADC12 alloys

Wang¹,

Yao²,

Zhao

et al. 2019

China Foundry

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Die casting process is widely applied in making Al parts. However, due to high speed of liquid metal flow in the die cavity, gases are prone to be entrapped in the filling, resulting in porosity defects. The X-ray computed tomography scanning technique was used to detect the pores in die-cast ADC12 alloys with different intensification pressures. The three-dimensional features of pores including pore size, number, sphericity have been obtained. The effect of different intensification pressures on two different kinds of pores, namely gas-pores and shrinkage pores, was analyzed. The results show that with increasing the pressure, the pore fractions and quantity gradually decrease. When the pressure increased to 85 MPa, the pores from gas entrapment during the mold filling were compressed, leading to a lower porosity fraction. The pressure cannot affect the pores in the samples with a thin wall (2 mm) due to a great solidification rate.

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Section: Influence Of Pressure On Pore Typementioning

confidence: 99%

Influence of intensification pressures on pores in die-cast ADC12 alloys

Wang¹,

Yao²,

Zhao

et al. 2019

China Foundry

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“…[9][10][11] Recently, three-dimensional (3D) porosity visualization studies have been extensively carried out through reconstruction from montage serial 2D sections 12,13) or high resolution X-ray computed tomography technology. [14][15][16][17] These quantitative analysis techniques make it possible to measure the porosity level with high accuracy, whereas their applications are limited to 2D metallographic sections or small-size specimens cut from HPDC castings. 15) To date the porosity levels in large-size HPDC castings are generally evaluated by measuring the density of the castings using Archimedes method.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Density and Microstructural Features in Vacuum Die Cast AZ91D Magnesium Alloy

2017

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Vacuum die castings of AZ91D magnesium alloy were produced at different slow shot speeds and the correlation between density and microstructural features in the vacuum die castings were investigated. The density was measured by using Archimedes method. The microstructure was analyzed with optical microscope, scanning electron microscopy and image analysis software. It was found that the partially solidi ed gate can be early closed-off by large-size particles at low enough slow shot speeds, which causes high levels of porosity in the vacuum die castings and thus low densities of the castings. Archimedes method is not suitable for evaluating the porosity level in the vacuum die castings. Besides the porosity levels, the densities of the vacuum die castings are related to the ESCs contents in the castings and solidi cation conditions in the shot sleeve at the beginning of die lling.

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“…Additionally, the values of ultimate tensile strength and fracture extension can be diminished by the presence of porosities, which are promoters of stress concentration and crack nucleation in bulk materials [4]. As for the dynamic mechanical properties, it is desirable to obtain materials with high damping properties, i.e., a high ability to dissipate elastic strain energy during mechanical vibration or wave propagation [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Treatment in the Static and Dynamic Mechanical Behavior of AZ91D Mg Alloy

Puga

Carneiro

Barbosa

et al. 2015

Metals

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The present study evaluates the effect of high-intensity ultrasound (US) in the static and dynamic mechanical behavior of AZ91D by microstructural modification. The characterization of samples revealed that US treatment promoted the refinement of dendrite cell size, reduced the thickness, and changed the β-Mg17Al12 intermetallic phase to a globular shape, promoted its uniform distribution along the grain boundaries and reduced the level of porosity. In addition to microstructure refinement, US treatment improved the alloy mechanical properties, namely the ultimate tensile strength (40.7%) and extension (150%) by comparison with values obtained for castings produced without US vibration. Moreover, it is suggested that the internal friction, enhanced by the reduction of grain size, is compensated by the homogenization of the secondary phase and reduction of porosity. It seems that by the use of US treatment, it is possible to enhance static mechanical properties without compromising the damping properties in AZ91D alloys.

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Correlation between Porosity and Fracture Mechanism in High Pressure Die Casting of AM60B Alloy

Cited by 72 publications

References 29 publications

Influence of intensification pressures on pores in die-cast ADC12 alloys

Influence of intensification pressures on pores in die-cast ADC12 alloys

Correlation between Density and Microstructural Features in Vacuum Die Cast AZ91D Magnesium Alloy

Effect of Ultrasonic Treatment in the Static and Dynamic Mechanical Behavior of AZ91D Mg Alloy

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