Superheat treatment of Al–7Si–0.55Mg alloy melt

Chen, Zhongwei; Wang, Jie; Zhang, Ruijie

doi:10.1016/j.matlet.2004.08.047

Cited by 39 publications

(11 citation statements)

References 10 publications

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“…In MTT process, the melt is superheated above critical temperatures. At this temperature, mostly Si-Si atomic clusters dissolve in melt, and new Al-Si clusters gets formed 28 . These lead to a decrement in sizes and the total number of clusters of Si-Si in the melt, and hence higher amount of undercooling is required for the nucleation of primary Si.…”

Section: Microstructure Analysismentioning

confidence: 99%

Combined effect of melt thermal treatment and Sr modifier on microstructure and mechanical properties of hypereutectic Al-14Si alloy

Manani

2023

Preprint

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This research aimed to investigate the combined effect of melt thermal treatment and Sr modifier on microstructure and mechanical properties of hypereutectic Al-14Si alloy. Various characterization techniques and testings such as optical microscopy, scanning electron microscopy, tensile test and hardness test were carried out to evaluate the samples. The results showed that the melt thermal treated alloys have a more refined primary Si phase and modified eutectic Si structure than that of the conventional cast alloys. This led to a considerable improvement in tensile strength, hardness and ductility in the melt thermal treated alloys. The mean size of primary Si and eutectic Si was lesser in the case of the sample that had undergone both melt thermal treatment and Sr-modification than the only Srmodified alloy. These lead to a significant improvement in mechanical properties of the alloy treated by both melt thermal treatment and Sr-modifier than only Sr-modified alloy.

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Section: Microstructure Analysismentioning

confidence: 99%

Combined effect of melt thermal treatment and Sr modifier on microstructure and mechanical properties of hypereutectic Al-14Si alloy

Manani

2023

Preprint

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“…According to the first researcher's findings, the particles are not able to act as nuclei at normal pouring temperature as they are not small enough, while they may dissolve at high temperatures and then the fine particles are reformed or precipitated which are appropriate for nucleation of small particles [9,10]. Another explanation attributes to particle refinement is the heredity phenomenon in the materials in which during the process of melting, clusters and solid particles that survived, may have influences on the re-solidified structures [7,8]. For example, Chen et al [8] claimed that the modification of eutectic Si in Al-7Si-0.55Mg melt by superheating treatment is by decreasing the Si-Si clusters heredity and altering its growth manner.…”

Section: Introductionmentioning

confidence: 99%

“…Besides modification, it has been proposed from different perspectives that for the purpose of refinement, superheating melt treatment is a modest and efficient method [6][7][8][9][10][11][12][13]. Nordin et al [14] reported that at a superheated temperature of 950 °C and holding time of 15 minutes, the primary Mg2Si with skeleton structure experienced size decrement of its fine polygonal structure.…”

Section: Introductionmentioning

confidence: 99%

“…Another explanation attributes to particle refinement is the heredity phenomenon in the materials in which during the process of melting, clusters and solid particles that survived, may have influences on the re-solidified structures [7,8]. For example, Chen et al [8] claimed that the modification of eutectic Si in Al-7Si-0.55Mg melt by superheating treatment is by decreasing the Si-Si clusters heredity and altering its growth manner.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Superheating Melt Treatment on Microstructure of Gd-Modified Al-15wt.% Mg2Si In-Situ Composite

Nanda

Ghandvar

Idris

et al. 2020

IJAME

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The influence of melt superheating treatment with different superheating temperatures (750, 800, 850, and 900°C) on the microstructure of Al-15wt. % Mg2Si composites before and after addition of Gd (1.0 wt.%) were studied. Microstructure characterisation was carried out via optical microscopy (OM) and x-ray diffraction (XRD).The results showed that in the unmodified composite, when the temperature of superheating raised from 750°C to 900°C, the primary Mg2Si experienced a decrease of the average grain size from 40 to about 32 µm, while, in the Gd-modified composite, the particle size was refined considerably from 27 to 13 µm by increasing the temperature from 750°C to 850°C. Furthermore, with a further increase in temperature to 900°C, the particle size slightly increased to about 15 µm which might be due to the burning loss of Gd in the melt. Nevertheless, for both unmodified and Gd-modified composites, the superheating temperature exhibited minor influence on the Mg2Si crystals morphologies. It is believed that compiling of Gd addition and superheating melt treatment is efficient to improve the composite properties that could encounter the application requirements.

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“…As indicated above, the use of the ultrasonic vibration process to continuously maintain the molten metal at high temperature for a period of time is problematic and is practically difficult to meet the needs of industry due to the limitations of refining with insufficient vibration. 9) Recently, Lee et al 27,28) reported that injecting an inert gas bubbling into the Al-Si melt reduces the amount of dissolved hydrogen in the melt, while increasing the nucleation rate of primary Si phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of Various Refinement Methods on the Morphologies of Primary Si in a Hypereutectic Al-18Si Alloy

et al. 2015

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The present study investigates the effect of different molten metal processing methods on the modification of primary silicon and the microstructure and mechanical properties of hypereutectic Al-18wt%Si alloy. The effects of melt treatment with the addition of electromagnetic vibration, AlCuP, bubbling of argon gas and their combination has been examined and an optimum procedure has been suggested for the treatment of molten Al-Si alloys, which resulted in the finest primary silicon particles with the highest tensile, impact and hardness properties and features of ductile fracture. This optimum procedure includes bubbling of the melt with argon gas for 15 min, the addition of 50 ppm of AlCuP master-alloy and stabilization of the melt for 15 min.

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Superheat treatment of Al–7Si–0.55Mg alloy melt

Cited by 39 publications

References 10 publications

Combined effect of melt thermal treatment and Sr modifier on microstructure and mechanical properties of hypereutectic Al-14Si alloy

Combined effect of melt thermal treatment and Sr modifier on microstructure and mechanical properties of hypereutectic Al-14Si alloy

Influence of Superheating Melt Treatment on Microstructure of Gd-Modified Al-15wt.% Mg2Si In-Situ Composite

Effect of Various Refinement Methods on the Morphologies of Primary Si in a Hypereutectic Al-18Si Alloy

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