Influence of Sr, Fe and Mn content and casting process on the microstructures and mechanical properties of AlSi7Cu3 alloy

Li, Zaidao; Limodin, Nathalie; Tandjaoui, Amina; Quaegebeur, Philippe; Osmond, Pierre; Balloy, David

doi:10.1016/j.msea.2017.02.041

Cited by 41 publications

(17 citation statements)

References 38 publications

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“…The previous results provide new insights into the understanding of the fatigue behavior of a recycled Al-Si-Cu alloy and the mechanism of the evolution of the fatigue damage. The 3D characterization of the fracture surfaces by micro-computed tomography and scanning electron microscopy shows that shrinkage pores and interacting gas pores are the main crack initiation sites of the alloy, what is in good agreement with other studies in this field [13]. Nevertheless, the analysis of nonmachined specimens reveal that the casting skin has a significant influence in the fatigue behavior, since it insulates the material from the air environment and promotes internal crack initiation.…”

Section: Discussionsupporting

confidence: 87%

3D characterization of the fracture mechanisms of a Fe-rich Al-Si-Cu alloy

et al. 2018

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The effect of the defect size and morphology on the fatigue damage evolution was analysed in a recycled Al-Si-Cu alloy by micro-computed tomography and scanning electron microscopy. Fatigue tests were performed and the different crack initiation scenarios were characterized and classified. The interaction between shrinkage and gas pores was the key crack initiation mechanism and the ß-Al5FeSi particles did not play any role in the crack initiation phase. However, crack path analysis indicated that there is a certain amount of crack advance by brittle fracture of the β-phase particles. This is in accordance with the findings of tensile tests in which the ductility depended strongly on the iron content.

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Section: Discussionsupporting

confidence: 87%

3D characterization of the fracture mechanisms of a Fe-rich Al-Si-Cu alloy

et al. 2018

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“…As 3D characterization for the Si phase could not be achieved with Lab-CT because Al and Si have close atomic numbers hence similar X-ray attenuation [3], a 2D metallographic analysis at a pixel size of 0.07 μm was realized. Quantitative measurement of the eutectic Si particles characteristics was performed with a Nikon YM-EPI light microscope equipped with a Sony color video camera.…”

Section: Characterization Technologiesmentioning

confidence: 99%

“…2D images obtained by optical microscope were analyzed by ImageJ/Fiji while 3D images were processed and analyzed using Avizo Fire software; the 3D images obtained in the as cast and heattreated conditions were registered using Avizo before image analysis. Details about the quantitative analysis process are reported in [3]. Quantitative analysis could then be realized to label the objects: to attribute each individual object a given label or color, and to measure several characteristics of the labelled objects.…”

Section: Image Processingmentioning

confidence: 99%

“…Al-Si aluminum alloys are now extensively used in various automotive components such as wheels and cylinder heads due to their light weight, good casting characteristics and mechanical properties [1]. The microstructure of Al-Si-Cu alloys can widely affect the mechanical properties, damage mechanisms and the fatigue failure [2,3]. Among the various microstructural parameters to consider are the Secondary Dendrite Arm Spacing (SDAS) [4], as well as the eutectic Si particles size and morphology [5].…”

Section: Introductionmentioning

confidence: 99%

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Effects of duration of solution heat treatment on the evolution of 3D microstructure in AlSi7Cu3 alloy: A quantitative X-ray tomography study

Limodin

Tandjaoui

et al. 2021

Materials Characterization

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The evolution of the microstructure of an AlSi7Cu3 alloy is investigated by optical microscopy and X-ray tomography in as-cast condition and with subsequent solution treatments for 2 h 30 min and 50 h at 495 °C, respectively. The analyzed microstructure contains pores and hard inclusions, i.e. eutectic Si, iron-intermetallics, and Al2Cu phases. 2D microscopic surface examination was performed to reveal the characteristics of eutectic Si phase while 3D characterization by X-ray tomography (Lab-CT) was performed for the pores, iron-intermetallics, and Al2Cu phases. The 3D quantitative characterization can provide new insight into the microstructures amount, size and morphology change mechanisms during heat treatment. The Al2Cu phase, which presents a 3D interconnected structure in the as-cast condition, undergoes significant morphological changes during the solution heat treatment. The incipient melting of Al2Cu phase was evidenced after 50 h of solution treatment at 495°C, which leads to the formation of small pores (<60µm). Statistical analyses of the Al2Cu particle distribution, their size and their local mean curvatures describe the disintegration of the interconnected network structure followed by the dissolving of the disconnected particles. The eutectic Si undergoes fragmentation, spheroidization, and coarsening during the solution treatment.

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“…By implementing adaptable alloying-and process technology, the mechanical properties will therefore be radically enhanced, leading to larger application fields of complex cast aluminium components such as safety details. Generally, the mechanical and microstructural properties of aluminium cast alloys are dependent on the composition (Badgayan, 2013;Fabrizi et al, 2013;Farkašová et al, 2013;Li et al, 2017;Shaha et al, 2016); melt treatment conditions, solidification rate (Fabrizi et al, 2015), casting process and the applied thermal treatment (Barhoumi et al, 2015;Manente and Timelli, 2011). Al-Si alloys usually contain Si and sometimes Mg or Cu as the main alloying elements (Mg and Cu strengthen the alloy matrix and improve the mechanical properties and alloy machinability), together with various impurities such as Fe, Mn, Zn or Cr.…”

Section: Introductionmentioning

confidence: 99%

Advantages of Colour Etching in Quality Control of Recycled Al-Si Cast Alloys

Tillová

Kuchariková

Chalupová

et al. 2019

Quality Production Improvement - QPI

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Colour Metallography is a set of light metallographic microscopy methodologies that utilize phase colour contrast as a source of new structure information compared to conventional techniques. In many cases, colour contrast can be induced where no identifiable phase contrast is obtained by conventional techniques. With the help of colour contrast, we gain new information on the structure of Al-Si alloys, especially intermetallic phases, in which the benefits of its use in casting quality control are of benefit. Blue-yellow contrast is definitely more pronounced than dark grey or light grey contrast. There is no substantial reproducible colour reproduction, since it is irrelevant whether the two phases are distinguished by blue-yellow or green-ocher contrast. When using the colour contrast, the structural components differ not only according to their microscopic appearance, but also based on the knowledge of the chemical composition of alloys, interactions between structural components, knowledge of the possible influence of Al-alloys structure (e.g. refining, modifications, heat treatment). Colour contrast in quality control of Al-Si alloys was applied to AlSiMg cast alloy (AlSi7Mg0.3; AlSi7MgTi; AlSi10MgMn; etc.)

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Influence of Sr, Fe and Mn content and casting process on the microstructures and mechanical properties of AlSi7Cu3 alloy

Cited by 41 publications

References 38 publications

3D characterization of the fracture mechanisms of a Fe-rich Al-Si-Cu alloy

3D characterization of the fracture mechanisms of a Fe-rich Al-Si-Cu alloy

Effects of duration of solution heat treatment on the evolution of 3D microstructure in AlSi7Cu3 alloy: A quantitative X-ray tomography study

Advantages of Colour Etching in Quality Control of Recycled Al-Si Cast Alloys

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