Effects of Pressure on the Mechanical  Properties and Microstructure of Die Cast Aluminum A380 Alloy

Obiekea, Kenneth N.; Aku, S.Y.; Yawas, Danjuma Saleh

doi:10.4236/jmmce.2014.23029

Cited by 14 publications

(13 citation statements)

References 7 publications

(16 reference statements)

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“…These results and conclusions are supported by previously reported studies by other investigators. 25,26 It has been shown ( Fig. 5a and b) that varying the intensification pressure during solidification has no measurable effect on either the heat transfer coefficient or the heat flux density.…”

Section: Discussionmentioning

confidence: 99%

The Influence of In-Cavity Pressure on Heat Transfer and Porosity Formation During High-Pressure Die Casting of A380 Alloy

Dargusch

Hamasaiid

Dour

et al. 2020

JOM

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This paper is concerned with the measurement of thermal properties and incavity pressures in cold chamber high-pressure die casting. The influence of in-cavity pressure on the casting porosity, heat flux, and heat transfer coefficient has been investigated during die casting of an A380 alloy. The die was instrumented with heat transfer and pressure sensors to measure these values directly. Direct measurement of the in-cavity pressure was found to be more reliable than the metal pressure calculated from pressure measurements in the hydraulic system. Variations on the intensification pressure directly affect the in-cavity pressure. Changing the intensification pressure between 17 MPa and 90 MPa had little effect on the heat flux and heat transfer which likely reach saturation at a lower pressure during the rapid filling stages. Increases in intensification pressure reduced the level of porosity within the castings, being most effective up to a value of 67.4 MPa.

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Section: Discussionmentioning

confidence: 99%

The Influence of In-Cavity Pressure on Heat Transfer and Porosity Formation During High-Pressure Die Casting of A380 Alloy

Dargusch

Hamasaiid

Dour

et al. 2020

JOM

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“…Increase in pressure reduces grain size and increases heat transfer rate; hence, yield strength and ductility of material increase in a squeeze casting of Al alloy [31,32]. Injection pressure die casting also improves the mechanical properties such as hardness, yield strength, tensile strength and grain refinement of A1350 [33]. Mechanical properties of cast Al-Si alloy achieved through low-pressure die casting has superior mechanical properties in comparison to sand casting, gravity die casting and high pressure die casting [34].…”

Section: Effect Of Casting Parameter On Properties Of Castmentioning

confidence: 99%

A review on properties and microstructure of micro-extruded product using SPD and as-cast material

Kumar

Panda

2018

Sādhanā

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Micromanufacturing has wide application in the development of micro-products, but these methods are limited in developing desired properties such as dimensional tolerance, surface texture and electromechanical properties. Deformation is one of the techniques where such limitations on micro-products can be overcome based on the principle of grain refinement theory. The product developed through subtractive and additive method reveals coarse grain microstructure, whereas ultrafine grains (UFGs) are observed in the severe plastic deformation (SPD) process. Equal-channel angular pressing (ECAP) is one of the best SPD techniques to produce UFG up to a nanometre. As-cast micro-extruded product that contains coarse grains seems to be inhomogeneous, having wide deviation of physical and mechanical properties throughout its volume. ECAPbased micro-extruded product is homogeneous and has uniform physical and mechanical properties. The present review paper discusses about the influence of die geometry, die strength, specimen selection, frictional condition, temperature condition and other boundary conditions on the properties of as-cast and ECAPed extruded material. Similarly, size and direction of grain can alter the mechanical properties based on requirements and type of applications.

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“…They have noticed that the amount of porosity does not affect the elastic characteristic (yield strength: YS) but decreases considerably the plastic properties (ultimate tensile strength: UTS and elongation: e%) of the material. With reference to the injection parameters of HDPC, Obiekea et al (2014) observed that tensile yield strength and hardness increase on the contrary of porosity when high injection pressure is applied. Such mechanical characteristics were improved due to refined microstructure obtained for the applied pressures up to 140 MPa.…”

Section: Introductionmentioning

confidence: 99%

Effect of Si, Cu and processing parameters on Al-Si-Cu HPDC castings

Outmani

Fouilland-Paillé

Isselin

et al. 2017

Journal of Materials Processing Technology

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Chemical composition of secondary Al-Si-Cu alloys and working variables of high-pressure die casting process (HPDC) may change for the same casting parts from one country to another in the world. They can even sometimes vary from one manufacturing site to another within the same country. An experimental study on the influence of alloying elements contents (Si and Cu), casting temperature and injection pressure on mechanical properties of die cast aluminum alloys was carried out to support the automotive industry suppliers in designing their cast parts. The microstructural features and the porosity level were also investigated and assessed. The primary objective is to highlight the modification mechanisms of the achieved properties using tensile tests, hardness measurements and microstructural observations performed on a HPDC casting parts. Low pressure and low temperature increase the rate of porosity, promote the formation of coarse Fe-rich intermetallic compounds and change the morphology of α-Al phases. These in turn deteriorate mechanical tensile properties. However, variation of alloying elements contents modifies the optimum properties achieved when part is made at constant casting processing parameters. Finally, the interactions between the studied parameters of HPDC and the chemical alloying elements show also a significant influence on the tensile properties.

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Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum A380 Alloy

Cited by 14 publications

References 7 publications

The Influence of In-Cavity Pressure on Heat Transfer and Porosity Formation During High-Pressure Die Casting of A380 Alloy

The Influence of In-Cavity Pressure on Heat Transfer and Porosity Formation During High-Pressure Die Casting of A380 Alloy

A review on properties and microstructure of micro-extruded product using SPD and as-cast material

Effect of Si, Cu and processing parameters on Al-Si-Cu HPDC castings

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