Investigation on the mechanism of grain refinement in aluminum alloy solidified under ultrasonic vibration

Jiang, Ripeng; Li, X. Q.; Zhang, M.

doi:10.1007/s12540-015-1012-x

Cited by 29 publications

(15 citation statements)

References 19 publications

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“…The second one is cavitation-induced dendrite fragmentation and grain multiplication. Bubble collapsing generates shock waves and sharp transient pressure spikes (up to 5 GPa) [15,30]. An acoustic stream of the shock waves scatters the nucleation throughout the melt, breaks dendrite arms and single crystals [11].…”

Section: Discussionmentioning

confidence: 99%

Improving mechanical properties of AlSi10Mg aluminum alloy using ultrasonic melt treatment combined with T6 heat treatment

Vatansever¹,

Ertürk²,

Karabay³

2020

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The purpose of this study is examining the effects of ultrasonic melt treatment on microstructure and mechanical properties of the AlSi10Mg alloy. In this study, ultrasonic melt treatment with different frequencies and duration was applied to AlSi10Mg molten alloy. Also, T6 heat treatment was applied to samples which were obtained by ultrasonic melt treatment (UST) with different application parameters to investigate the combination of T6 heat treatment and UST effect on the microstructure and mechanical properties. The microstructure of cast samples was characterized by optical and scanning electron microscopy. Also, hardness and tensile tests were carried out. The results indicate that primary α-Al phases are transformed from coarse dendrites to smaller dendrites by the ultrasonic melt treatment. Besides, secondary dendrite arm spacing of the alloy decreased and mechanical properties such as hardness and tensile strength increased. UST reduces the secondary dendrite arm spacing (SDAS) of the aluminum alloy to 50 %. Additionally, increasing treatment time contributes to hardness up to 12 % and tensile strength up to 50 %.

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Section: Discussionmentioning

confidence: 99%

Improving mechanical properties of AlSi10Mg aluminum alloy using ultrasonic melt treatment combined with T6 heat treatment

Vatansever¹,

Ertürk²,

Karabay³

2020

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“…As shown in Figure 2c, the 2024 solid insert was dissolved in the melt after keeping at 2024 Al melt for 5 s, finer grains were noticed in the central region of the ingot, and the grains were clearly larger at the periphery of the ingot. When the immersion time increased to Metals 2019, 9,1126 4 of 10 20 s (Figure 2d), the solidified structure consisted of fine and uniform grains. However, the grains size of the ingot was increased remarkably while the immersion time of 2024 Al insert increased to 40 s, as shown in Figure 2e.…”

Section: Macro and Micro Structure Characterizationmentioning

confidence: 99%

“…Usually, adding grain refiners and/or applying physical stirring can be used to refine grains. Physical means mainly include electromagnetic stirring [5][6][7], ultrasonic stirring [8][9][10], mechanical stirring [11], and gas bubbles [12]. Various electromagnetic stirring technologies such as casting, refining, electromagnetic (CREM), low-frequency electromagnetic casting (LFEC), and annular electromagnetic stirring (A-EMS) have been applied in the solidification process.…”

Section: Introductionmentioning

confidence: 99%

“…For ultrasonic stirring, Kotadia et al [8] explored grain refinement under ultrasonication. Li et al [9,10] researched the application of single and multiple ultrasonic treatments during semi-continuous casting. These methods have been used successfully in achieving grain-refined structures, but it is not easy to apply these into the Al casting process due to the requirement of the specific equipment when compared with adding grain refiners.…”

Section: Introductionmentioning

confidence: 99%

“…Metals 2019, 9,1126 2 of 10 Various grain refiners have been developed to refine the as-cast structures of aluminum alloys, such as Al-Ti-B alloys, an Al-Ti-C master alloy, a nano-grain refiner, and Zr and Sc elements. It is well known that the Al-5Ti-B master alloy is an effective grain refiner for Al alloys with many advantages, such as having a high utilization ratio of Ti and B, fine refinement effect, and easy automation [13].…”

Section: Introductionmentioning

confidence: 99%

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Effect of 2024 Al Alloy Insert on the Grain Refinement of a 2024 Al Alloy Prepared via Insert Mold Casting

Zhu

Zhao

Wang

et al. 2019

Metals

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In this study, an insert mold casting was fabricated by inserting 2024 Al extruded rods into a 2024 Al melt. The molds were kept at a 2024 Al melt for different times. The 2024 Al extruded rods were used to refine the 2024 Al alloy grains because the advantage of this method is that it is contamination free compared with other grain refiners. Moreover, we investigated the macro and microstructure of the ingots. Further, we analyzed the refinement mechanism of the 2024 Al rod on the 2024 Al alloy. Our result showed that when the immersion time of the 2024 Al insert was 0 s, a metallurgical bonding was partly formed between the 2024 Al insert and the 2024 Al alloy mold cast. When the immersion time of the 2024 Al insert increased to 5 s, the 2024 solid insert was dissolved in the liquid; the coarse dendritic grains were replaced by fine equiaxed grains. The refinement mechanism for the insertion of a 2024 Al rod on the 2024 Al alloy was to melt the 2024 Al insert and have it decrease the degree of the liquid superheat, which thus increased the cooling rate and provided a large number of small particles that acted as the nucleus of heterogeneous nucleation. However, these particles were melted gradually in the high-temperature liquid after an increase of immersion time. Thus, the refinement effect of 2024 Al insert on the solidified structure was weakened.

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Ultrasonic Mastering of Filter Flow and Antifouling of Renewable Resources

Radziuk

Möhwald

2016

ChemPhysChem

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Abstract:Inadequate access to purify water and sanitation requires new ergonomic methods at lower cost, less energy consumption, minimal use of chemicals and impact on the environment. Among them ultrasound is a unique means to control physics and chemistry of complex fluid (wastewater) with excellent performance in mass transfer, cleaning and disinfection. In membrane filtration processes it overcomes diffusion limits and can accelerate the fluid flow towards the filter preventing antifouling. Here we outline the current state of knowledge and technological design with the focus on physico-chemical strategies of ultrasound for water cleaning. We highlight important parameters of ultrasound for the delivery of fluid flow from a technical perspective employing principles of physics and chemistry. By introducing various ultrasonic methods involving bubbles or cavitation in combination with external fields we show advancements in flow acceleration and mass transportation to the filter. In most of them we emphasize the main role of streaming and impact of cavitation with a perspective to prevent and remove fouling deposits during the flow. We also elaborate on the deficiencies of present technology and on problems to be solved to achieve a wide spread application.

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Investigation on the mechanism of grain refinement in aluminum alloy solidified under ultrasonic vibration

Cited by 29 publications

References 19 publications

Improving mechanical properties of AlSi10Mg aluminum alloy using ultrasonic melt treatment combined with T6 heat treatment

Improving mechanical properties of AlSi10Mg aluminum alloy using ultrasonic melt treatment combined with T6 heat treatment

Effect of 2024 Al Alloy Insert on the Grain Refinement of a 2024 Al Alloy Prepared via Insert Mold Casting

Ultrasonic Mastering of Filter Flow and Antifouling of Renewable Resources

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