Strength-Ductility Behaviour of Al-Si-Cu-Mg Casting Alloys in T6 Temper

Cáceres, C. H.; Svensson, Ingvar L; Taylor, J. A.

doi:10.1080/13640461.2003.11819539

Cited by 154 publications

(85 citation statements)

References 41 publications

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“…2) generally depends on the yield strength and on the mobility of the dislocations [75]. The correlation between n 1 and yield strength is shown in Figure 13 for data from the present investigation together with data from Alexopoulus et al [76] for an Al-7Si-0.55Mg alloy and from Caceres et al [77] for various Al-Si-Cu-Mg alloys. One curve at low yield strength splits into two at higher yield strength, one for Al-Si-Mg alloys and Al-Si-Cu-Mg alloys with low Cu and another for Al-SiCu-Mg alloys with high Cu.…”

Section: Hollomon and Ludwigson Equationssupporting

confidence: 48%

“…The storage rate remains low at slight overageing for the Al-Si-Mg alloy ( Figure 14a), indicating that the precipitates remain coherent, to increase at longer overageing. The [77] Al-7Si-0.55Mg [76] overageing (Figure 14b), indicating that a mixture of coherent and non-coherent precipitates form, where the non-coherent precipitates are looped by dislocations contributing to the orage rate of dislocations. The magnitude of the storage rate is much larger for the Al-Si-Cuthe higher solute concentration in the Al-Siles to dislocation motion.…”

Section: Kocks-mecking Strain Hardening Modelmentioning

confidence: 99%

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The heat treatment of Al–Si–Cu–Mg casting alloys

Sjölander

Seifeddine

2010

Journal of Materials Processing Technology

460

269

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Environmental savings can be made by increasing the use of aluminium alloys in the automotive industry as the vehicles can be made lighter. Increasing the knowledge about the heat treatment process is one task in the direction towards this goal. The aim of this work is to investigate and model the heat treatment process for Al-Si casting alloys. Three alloys containing Mg and/or Cu were cast using the gradient solidification technique to achieve three different coarsenesses of the microstructure and a low amount of defects.Solution treatment was studied by measuring the concentration of Mg, Cu and Si in the α-Al matrix using wavelength dispersive spectroscopy (WDS) after various times at a solution treatment temperature. A diffusion based model was developed which estimates the time needed to obtain a high and homogenous concentration of alloying elements for different alloys, temperatures and coarsenesses of the microstructure. It was shown that the yield strength after artificial ageing is weakly dependent on the coarseness of the microstructure when the solution treatment time is adjusted to achieve complete dissolution and homogenisation.The shape and position of ageing curves (yield strength versus ageing time) was investigated empirically in this work and by studying the literature in order to differentiate the mechanisms involved. A diffusion based model for prediction of the yield strength after different ageing times was developed for Al-Si-Mg alloys. The model was validated using data available in the literature. For Al-Si-Cu-Mg alloys further studies regarding the mechanisms involved need to be performed.Changes in the microstructure during a heat treatment process influence the plastic deformation behaviour. The Hollomon equation describes the plastic deformation of alloys containing shearable precipitates well, while the Ludwigson equation is needed when a supersaturated solid solution is present. When non-coherent precipitates are present, none of the equations describe the plastic deformation well. The evolution of the storage rate and recovery rate of dislocations was studied and coupled to the evolution of the microstructure using the Kocks-Mecking strain hardening theory.

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Section: Hollomon and Ludwigson Equationssupporting

confidence: 48%

Section: Kocks-mecking Strain Hardening Modelmentioning

confidence: 99%

The heat treatment of Al–Si–Cu–Mg casting alloys

Sjölander

Seifeddine

2010

Journal of Materials Processing Technology

460

269

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“…Silicon is generally said to increase the Al-Si mechanical properties, however in the case of low magnesium and low iron alloys, the silicon addition may decrease both their tensile strength and ductility [6]. This is in accordance with the conducted investigations, in which increasing Si content reduces the alloys mechanical properties.…”

Section: Discussionsupporting

confidence: 79%

“…Addition of Si (p<0.0001) and Fe (p<0.0001) decrease the final property, while Na addition (p=0.0065) is beneficial. The relationship between Si, Na and Fe content and final property is given with equation (6). R 2 coefficient of determination for this model is equal 0.8577, normal probability plot of residuals (Fig.…”

Section: (4)mentioning

confidence: 99%

Influence of the Chemical Composition on Electrical Conductivity and Mechanical Properties of the Hypoeutectic Al-Si-Mg Alloys

Dybowski

Szymszal

Poloczek

et al. 2016

Archives of Metallurgy and Materials

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Due to low density and good mechanical properties, aluminium alloys are widely applied in transportation industry. Moreover, they are characterized by the specific physical properties, such as high electrical conductivity. This led to application of the hypoeutectic Al-Si-Mg alloys in the power generation industry. Proper selection of the alloys chemical composition is an important stage in achievement of the demanded properties. The following paper presents results of the research on the influence of alloys chemical composition on their properties. It has been revealed that Si and Ti addition decreases electrical conductivity of the Al-Si-Mg alloys, while Na addition increases it. The mechanical properties of the investigated alloys are decreased by both silicon and iron presence. Sodium addition increases ductility of the Al-Si-Mg alloys.

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“…Aluminum-silicon alloys have been put into practice in the automotive industry, by virtue of being low in density, while maintaining adequate strength [1]. Among these, numerous studies regarding the 357 alloy have been carried out in terms of mechanical properties and microstructure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Mechanical Properties of a Rheocast 357 Alloy Using the SEED Method

Samuel

Zheng

2011

MSF

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The ability of Al-Si alloys to be cast into complex shapes, coupled with a favourable strength-to-weight ratio, has given them an advantage in the automotive industry. To further improve casting quality, many have turned to semi-solids, where alloys exhibit flow properties that stem from the material's dual liquid-solid nature and globular microstructure. The SEED (Swirled Enthalpy Equilibration Device) process is a novel rheocasting technology yielding a semi-solid slurry from the mechanical agitation (swirling) and cooling of molten aluminum. In the current work, a SEED processed 357-T6 alloy displayed typical yield and ultimate tensile strength values of 210-250 and 300-320 MPa, respectively. Furthermore, the average elongation observed was 12-17%.

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Strength-Ductility Behaviour of Al-Si-Cu-Mg Casting Alloys in T6 Temper

Cited by 154 publications

References 41 publications

The heat treatment of Al–Si–Cu–Mg casting alloys

The heat treatment of Al–Si–Cu–Mg casting alloys

Influence of the Chemical Composition on Electrical Conductivity and Mechanical Properties of the Hypoeutectic Al-Si-Mg Alloys

Effect of Heat Treatment on the Mechanical Properties of a Rheocast 357 Alloy Using the SEED Method

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