Microstructural evolution of iron-rich intermetallic compounds in scandium modified Al-7Si-0.3Mg alloys

Chanyathunyaroj, Kittisak; Patakham, Ussadawut; Kou, Sindo; Limmaneevichitr, Chaowalit

doi:10.1016/j.jallcom.2016.09.132

Cited by 31 publications

(7 citation statements)

References 23 publications

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“…The addition of RE elements can solve this problem, which is reported in the relevant references. [ 12,47b,90 ] Therefore, to obtain the conductive Al alloy with excellent comprehensive properties, it is quite necessary to add a small number of RE elements to reduce Fe's harmful impacts.…”

Section: Recent Progress On Overcoming the Contradiction Between Conductivity And Strengthmentioning

confidence: 99%

Conductive Al Alloys: The Contradiction between Strength and Electrical Conductivity

et al. 2021

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In recent years, the severe energy consumption identified in the global powertransmission process makes the development of new generation of transmission materials with high strength (mainly the ultimate tensile strength) and outstanding electrical conductivity (EC) more urgent. Though Al and its alloys received significant attention from the scientific community in the past two decades due to their relatively high mechanical properties and excellent EC, increasing strength and EC are often incompatible in Al conductor alloys, which remains unresolved. Therefore, the ways to achieve the optimal compromise between the strength and EC has become a hot topic in current researches. This review focuses on the high-strength conductive Al alloys that have been studied by researchers in the past two decades, and endeavors to reveal the relationship between the EC and the strength based on composition, microstructure, interface, and others. Moreover, the design ideas and treatment measures considering both conductivity and strength are also summarized.

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Section: Recent Progress On Overcoming the Contradiction Between Conductivity And Strengthmentioning

confidence: 99%

Conductive Al Alloys: The Contradiction between Strength and Electrical Conductivity

et al. 2021

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“…Thus, most Fe forms Fe-rich intermetallic compounds together with other elements, which appear as needles or sharp edges in the microstructure. Some types of Fe-rich intermetallic compounds are very harmful to mechanical properties, especially ductility [1]. The particles present in Al-Mg-Si alloys during solidification are mostly β-AlFeSi (generally the β-Al 5 FeSi phase), α-AlFeSi (generally the α-Al 8 Fe 2 Si phase) and Mg 2 Si [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Some types of Fe-rich intermetallic compounds are very harmful to mechanical properties, especially ductility [1]. The particles present in Al-Mg-Si alloys during solidification are mostly β-AlFeSi (generally the β-Al 5 FeSi phase), α-AlFeSi (generally the α-Al 8 Fe 2 Si phase) and Mg 2 Si [1][2][3]. These alloys are not suitable for hot forming processes in the as-cast state or in processes of intensive deformation, as occurs in extrusion.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Different Solution Treatments in the Transformation of β-AlFeSi Particles into α-(FeMn)Si and Their Influence on Different Ageing Treatments in Al–Mg–Si Alloys

Álvarez-Antolín

Lozano

Cofiño-Villar

et al. 2020

Metals

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In the as-cast state, Al–Mg–Si alloys are not suitable for hot forming. They present low ductility due to the presence of intermetallic β-AlFeSi particles that form in the interdendritic regions during the solidification process. Homogenization treatments promote the transformation of these particles into α-(FeMn)Si particles, which are smaller in size and more rounded in shape, thus improving the ductility of the material. This paper analyses the influence of various solution treatments on the transformation of β-AlFeSi particles into α-(FeMn)Si particles in an Al 6063 alloy. Their effect on different ageing treatments in the 150–180 °C temperature range is also studied. An increase in the solution temperature favours greater transformation of the β-AlFeSi particles into α-(FeMn)Si, dissolving a greater amount of Si, thereby having a significant effect on subsequent ageing. We found that as the dwell time at a temperature of 600 °C increases, the rate of dissolution of the Fe atoms from α-(FeMn)Si particles exceeds the rate of incorporation of Mn atoms into said particles. This seems to produce a delay in reaching the peak hardness values in ageing treatments, which warrants further research to model this behaviour. The optimal solution treatment takes place at around 600 °C and the highest obtained peak hardness value is 104 HV after a 2 h solution treatment at said temperature and ageing at 160 °C for 12 h.

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“…[ 4–6 ] Iron is the most common harmful impurity to restrict the recycling of Al–Si alloys, due to the large size Fe‐rich intermetallic produced during each cycle process. [ 7 ] Specifically, with the increase in Fe content, the Fe‐rich intermetallic will change from α ‐Al 15 Fe 3 Si 2 (or Al 8 Fe 2 Si) phase with skeleton morphology to the β ‐Al 9 Fe 2 Si 2 phase with needle‐like or plate‐like shape. [ 8 ] However, the coarse β ‐Al 9 Fe 2 Si 2 phase will continuously grow up in length, leading to the blocked feeding channels and weak melt flows between dendrites, as well as the reduced feeding capacity and increased shrinkage defects.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Optimization of Fe‐Rich Intermetallic in Al–12 wt% Si–2 wt% Fe alloys by Adding Travelling Magnetic Fields

Xia

Luo

et al. 2020

Adv Eng Mater

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Iron can cause negative effects on the recycling and mechanical performance of Al–Si alloys, because it is difficult to remove, and easy to form Fe‐rich intermetallic with large size. In this regard, travelling magnetic fields are performed to optimize Fe‐rich intermetallic in Al–12 wt% Si–2 wt% Fe alloys; and experiments and simulations are conducted to study the related evolutions induced by different Fe content from 0.1 to 2 wt% and by travelling magnetic fields. Current findings conclude that the increase of Fe content changes the precipitation sequence, causing Fe‐rich intermetallic to preferentially form and convert from α‐Al8Fe2Si to β‐Al9Fe2Si2; accompanied by the increase of aspect ratio and max‐length from 1.81 and 15.0 μm ( wt% Fe) to 50.2 and 578.2 μm (2 wt% Fe) respectively, as well as the decrease of curvature from 0.079 μm−1 (0.1 wt% Fe) to 0.001 μm−1 (2 wt% Fe). Moreover, precipitates containing Cu shift from adhering to the (Al, Si) phases to Fe‐rich intermetallic. In additionally, primary Si particles and Al–Si eutectic phases decrease. Noteworthily, travelling magnetic fields can reduce nucleate radius and generate intense long‐range directional melt flows, further to distribute temperature and solute uniformly and break up Fe‐rich intermetallic, so as to optimize them. Consequently, max‐length and aspect ratio decrease by 43.7% and 44.6%, whereas curvature increases by 2.7 times.

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Microstructural evolution of iron-rich intermetallic compounds in scandium modified Al-7Si-0.3Mg alloys

Cited by 31 publications

References 23 publications

Conductive Al Alloys: The Contradiction between Strength and Electrical Conductivity

Conductive Al Alloys: The Contradiction between Strength and Electrical Conductivity

Analysis of Different Solution Treatments in the Transformation of β-AlFeSi Particles into α-(FeMn)Si and Their Influence on Different Ageing Treatments in Al–Mg–Si Alloys

Microstructural Optimization of Fe‐Rich Intermetallic in Al–12 wt% Si–2 wt% Fe alloys by Adding Travelling Magnetic Fields

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