The Effect of Porosity on the Microstructure and Mechanical Properties of Die Cast Mg Alloys

Moscovitch, N.; Gertsberg, G.; Nagar, N.; Lautzker, M.; Fantetti, N.; Bronfín, B.

doi:10.4271/2006-01-0524

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…The damages are identified such as defective surface quality, faulty component and deficient mechanical properties. Porosity percentage significantly impact Ultimate Tensile Strength (UTS) and Tensile Yield Strength (TYS) of metal [1], shown in Fig. 1(c) and 1(d).…”

Section: Casting Defectsmentioning

confidence: 96%

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Numerical and Experimental Analysis on Runner and Gate Positioning for Magnesium Alloy Die-Casted Test Piece

Ibrahim

Tan

Roslan

et al. 2020

MSF

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High Pressure Die Casting (HPDC) is a manufacturing process producing complex and precise products by injecting molten material into mold cavity at top speed and pressure. The quality of product is highly related with mold cavity design. Casting defects due to inappropriate mold design will affect mechanical properties, surface quality and product life cycle. Optimization of runner system is essential to manufacture complex and precision product design with minimal defects. The combination of runner and gating system is investigated in this paper. This paper investigated the effect of runner and gating optimization in reducing the gas porosity inside casting by evaluating the fluid and thermal distribution behavior in experimental and Computational Fluid Dynamic (CFD). The gas porosity generated in the molten magnesium alloy is due to the turbulent flow and the inconsistency of the fluid flow to push the gas bubble away from the main casting. This paper includes an X-ray of a sample product that shows correlation between gas porosity and CFD results. Results show that localize porosity gathered at the bottom of the main casting. Based on localized porosity position, runner and gating system is modified and numerical simulation is carried out for analysis. An inspection instrument step-type test piece is taken as an investigation sample to illustrate the technique of design modifications and improvements. Process parameters considered in this paper are injection speed, injection pressure, melt temperature and mold temperature. This paper proposed new runner designs that can generate balanced velocity and temperature distribution inside mold cavity, improving the solidification process aimed for reducing casting defects.

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Section: Casting Defectsmentioning

confidence: 96%

“…The productivity performance of HPDC is high among manufacturing process especially in production line. HPDC is applicable for both ferrous and non-ferrous products [1]. The process of Metal Injection Molding (MIM) is similar to plastic injection molding, where it starts with the preparation of raw material in granular size.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis on Runner and Gate Positioning for Magnesium Alloy Die-Casted Test Piece

Ibrahim

Tan

Roslan

et al. 2020

MSF

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“…3) according to the characteristics of samples manufactured under Schemes 1 and 2 and the strength characteristics of the low porous samples [6,12]. Both curves obtained for small values of porosity, have sharper relationship, and when the porosity is higher than 4% they become flatter, and the influence on the strength decreases.…”

Section: Resultsmentioning

confidence: 99%

“…2. Zinc does not form intermediate phases in alloy, it is dissolved in magnesium and partly included in the phase γ (Mg, Zn) 17 (Al, Zn) 12 .…”

Section: Resultsmentioning

confidence: 99%

Effect of the Porosity Ran ge and its Nature on Mechanical Properties of Magnesium Alloys Mg-Al-Zn

Ismailov¹,

Ramazanova²,

Nigmetchanova³

et al. 2016

Eur Chem Tech J

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The possibilities of porosity adjustment in alloys of the Mg-Al-Zn system obtained by melting under a layer of flux were studied. The elements that significantly increase corrosion resistance and heat resistance, and improve mechanical strength and technological characteristics were chosen as doping components. Measurements showed that the range of porosity varied between 5.9 and 14.8%, and the relationship between porosity and strength of alloys was defined for the first time for this range.For an alloy with porosity of 14.8%, the percentage of open pores was 12.8% while the percentage of closed pores was 2%. Micro-hardness of alloys with the given porosity was 661 MPa after casting, 876 MPa after homogenizing annealing and 897 MPa after artificial aging. The tensile strength was 235 MPa. Analysis identified that the main cause of porosity was catching atoms of hydrogen from atmosphere by molten alloys during melting, casting and liquation. In order to reduce the percentage of porosity alloys were doped by metal manganese, liquid metal was processed by calcium and hexachloroethane, and casting form was treated by boron nitride. These manipulations resulted in reduction of samples porosity up to 5.9%, increase of tensile strength up to 240 MPa. Open porosity was 4.5%, while closed porosity was 1.4%. At the same time micro-hardness of cast samples was 867 MPa, 903 MPa after homogenization annealing and 961 MPa after artificial aging. Further reduction of porosity and increasing of magnesium alloys strength is possible with the use of inert gases or vacuum melting. Samples porosity can be increased by more than 14.8% with the help of melting in the hydrogen containing atmosphere.

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Exploring the Microstructure-Property Relationship of Mg-Al-Mn Alloys Enhanced via Friction Stir Processing

García

Das

et al. 2022

The Minerals, Metals &Amp; Materials Series

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The Effect of Porosity on the Microstructure and Mechanical Properties of Die Cast Mg Alloys

Cited by 5 publications

References 2 publications

Numerical and Experimental Analysis on Runner and Gate Positioning for Magnesium Alloy Die-Casted Test Piece

Numerical and Experimental Analysis on Runner and Gate Positioning for Magnesium Alloy Die-Casted Test Piece

Effect of the Porosity Ran ge and its Nature on Mechanical Properties of Magnesium Alloys Mg-Al-Zn

Exploring the Microstructure-Property Relationship of Mg-Al-Mn Alloys Enhanced via Friction Stir Processing

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