Microstructural Evolution during Partial Remelting of Al–Si Alloys Containing Different Amounts of Magnesium

Abedi, Amir Reza; Shahmiri, M.; Esgandari, B. Amir; Nami, B.

doi:10.1016/j.jmst.2013.04.021

Cited by 29 publications

(10 citation statements)

References 21 publications

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“…Upon adding 1.0 wt% La in the alloy, the eutectic growth temperature was lowered to 562°C. From the cooling curves and the undercooling could be calculated [17,18]. The results showed that the undercooling for a-Al nucleation decreased due to RE addition.…”

Section: Discussionmentioning

confidence: 99%

Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

Zhang

Liu

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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The cooling rate sensitivities of AlTiB, RE and AlTiB-RE refiners were investigated using laboratory experiments and the actual industrial applications of A356 automotive wheel via low pressure die casting technology. Their impact mechanisms on the microstructure and mechanical properties of the A356 alloy were discussed. The results demonstrated that the AlTiB-RE refiner possessed most effective and synergetic refinement effects compared to the individual AlTiB or RE refiners. The AlTiB-RE refiner exhibited the least sensitivity to the cooling rate changes than the other refiners. The comprehensive properties of alloy wheel refined by the AlTiB-RE refiner were improved significantly. The tensile strength, yield strength, and elongation of wheel spoke improved by approximately 11.3%, 10.8% and 44.1%, respectively. The property difference values of the tensile strength, yield strength, and elongation in different positions of the wheel decreased from 14.8%, 31.2% and 47.7% to 8.6%, 27.1% and 30.9%, respectively.

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Section: Discussionmentioning

confidence: 99%

Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

Zhang

Liu

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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“…The additional Mg was added to assist in forming additional Mg2Si, which will improve the macroscopic mechanical properties. Further, additional Mg will result in a primary-phase grain refinement [30]. Salleh et al [31] indicated that the fracture behavior of the thixoformed alloys was improved after a T6 heat treatment, with significantly higher ductility.…”

Section: Alloy Developmentmentioning

confidence: 99%

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Wang

Zhang²,

Phillion

et al. 2016

J. Mater. Res.

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A novel two-stage reheating process with new alloy design has been developed to improve the microstructure morphology of semi-solid Al-Si casting aluminum alloy for thixoforming. The process consists of first reheating the material to the liquidus temperature, holding for 5 minutes, and then lowering to the predetermined two-stage reheating temperature between 843 -863 K and holding for 10 minutes. The experimentally-obtained grain diameter, roundness, and the amount of liquid trapped within the solid phase were characterized, along with the microstructure obtained using the traditional feedstock reheating process. The Wilcox test (with α=0.05) was then applied to statistically analyze the measured differences in the microstructures obtained using the two different processing routes. It was found that a refined near-spherical structure with uniform globule size, higher sphericity, lower coarsening rate constant, and less entrapped liquid was obtained via the new two-stage reheating process in comparison with the microstructure obtained using the traditional feedstock reheating process.

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“…The variable in the experiments was the composition of the powder mixtures zeolite-SiO 2(NPs) to be injected (0, 2.5, 5, 7.5, 10, or 12.5 wt-% of SiO 2(NPs) ). The mass of the powders to be injected was calculated considering the SiO 2 as the solid reagent and spinel and silicon as products according to the chemical reaction (1). For each experiment, samples of the melt were obtained every 10 min and the produced dross (oxidized material) was collected at the end of the experiment.…”

Section: Selection Of the Al Alloy And Mg Removal By Injectionmentioning

confidence: 99%

“…Al-Si alloy is one of the aluminum casting alloys widely used in automotive industries due to its excellent microstructure, casting, and mechanical characteristics as is the A380 alloy. Abedi et al [1] showed that magnesium can refine the size of primary (Al) phase and eutectic silicon. Vončina et al [2] established the grain refining influence by Ce in A380 alloy.…”

Section: Introductionmentioning

confidence: 99%

Magnesium Removal from an Aluminum A-332 Molten Alloy Using Enriched Zeolite with Nanoparticles of SiO₂

Muñoz-Arroyo

Hdz-García

Escobedo‐Bocardo

et al. 2014

Advances in Materials Science and Engineering

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In order to improve the Mg removal from an A-380 molten alloy, mixtures of zeolite and SiO 2 nanoparticles (SiO 2(NPs) ) were tested. Zeolite was enriched with 2.5, 5, 7.5, 10, or 12.5 wt-% of amorphous SiO 2(NPs) . The SiO 2(NPs) and zeolite were mixed for 30 min in ethanol for each experiment and then dried in a furnace at 80 ∘ C for 12 h. The enriched zeolites were analyzed by scanning electron microscopy, transmission electron microscopy, and N 2 gas adsorption analysis. The Mg removal was carried out injecting each mixture into the molten aluminum alloy at 750 ∘ C using argon. The Mg content of the molten alloy was measured after different periods of the injection time. Zeolites enriched with 2.5 and 5 wt-% of SiO 2(NPs) were demonstrated to be the better mixtures, removing Mg from an initial content of 1.6 to a final content of 0.0002 and 0.0101 wt-%, respectively, in 45 min of injection.

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Microstructural Evolution during Partial Remelting of Al–Si Alloys Containing Different Amounts of Magnesium

Cited by 29 publications

References 21 publications

Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Magnesium Removal from an Aluminum A-332 Molten Alloy Using Enriched Zeolite with Nanoparticles of SiO₂

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Microstructural Evolution during Partial Remelting of Al–Si Alloys Containing Different Amounts of Magnesium

Cited by 29 publications

References 21 publications

Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Magnesium Removal from an Aluminum A-332 Molten Alloy Using Enriched Zeolite with Nanoparticles of SiO2

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Resources

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Magnesium Removal from an Aluminum A-332 Molten Alloy Using Enriched Zeolite with Nanoparticles of SiO₂