Formation of Microstructure in Al‐Si Alloys under Ultrasonic Melt Treatment

Zhang, L.; Eskin, Dmitry; Miroux, A.; Katgerman, L.

doi:10.1002/9781118359259.ch174

Cited by 18 publications

(12 citation statements)

References 22 publications

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“…The method widely used to refine the grain structure of a casting is by the addition of a grain refiner master alloy containing potent nucleant particles [4]. Research has also been undertaken to refine the microstructure by the application of an external field [5][6][7][8][9][10], including electric current pulse (ECP) [5], pulsed magnetic field (PMF) [6], pulse magneto-oscillation (PMO) [7,8], and ultrasonic treatments (UT) [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Literature has shown that the introduction of high intensity UT to a metal or alloy melt can result in a noticeable reduction in grain size, often accompanied by changes in grain morphology [9][10][11][12][13][14]. The influence of UT on microstructural refinement is based on the physical phenomena that occur during the propagation of high intensity ultrasound in the melt, including ultrasonically-induced cavitation and acoustic streaming.…”

Section: Introductionmentioning

confidence: 99%

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The role of ultrasonic treatment in refining the as-cast grain structure during the solidification of an Al–2Cu alloy

Wang¹,

Dargusch²,

Qian³

et al. 2014

Journal of Crystal Growth

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119

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Abstract. The effect of Ultrasonic Treatment (UT) over selected temperature ranges during cooling and solidification of an Al-2Cu alloy melt on the grain structure and cooling behaviour of the alloy has been investigated using a molybdenum sonotrode introduced without preheating. UT was applied over various temperature ranges before, during and after the nucleation of primary aluminium grains. It was found that ultrasonic grain refinement was achieved only when UT was applied from more than 20 o C above the liquidus temperature until below the liquidus temperature after nucleation has occurred. Applying UT from 40 o C or 60 o C above the liquidus to just above the liquidus brings the melt to a condition that favours nucleation, survival of the nucleated grains and their subsequent transport throughout the melt. Continuing to apply UT beyond the liquidus for a short time enhances both nucleation and convection thereby ensuring the formation of a fine, uniform equiaxed grain size throughout the casting. The lack of grain refinement when UT was applied from 20 o C above the liquidus temperature or from temperatures below the liquidus temperature is attributed to the formation of a strong solidified layer on the sonotrode which hinders the effective transmission of ultrasonic irradiation into the liquid metal. The application of a preheated sonotrode showed that formation of a solid layer can be prevented by preheating the sonotrode to 285 o C. Thus, an appropriate amount of superheat of the liquid metal or sufficient preheating of the sonotrode is necessary for ultrasonic grain refinement when a sonotrode is introduced into the melt.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The role of ultrasonic treatment in refining the as-cast grain structure during the solidification of an Al–2Cu alloy

Wang¹,

Dargusch²,

Qian³

et al. 2014

Journal of Crystal Growth

Self Cite

119

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show abstract

“…Titreşimli döküm elektromanyetik, ultrasonik ve mekanik titreşim gibi birçok titreşim oluşturabilecek yöntemi içermektedir. Mekanik titreşim elektromanyetik ve ultrasonik titreşim yöntemlerine kıyasla daha kolay uygulanabilir ve denetimi nispeten zor olmayan bir yöntemdir [8][9][10][11][12][13].…”

Section: ç Yükselunclassified

TİTREŞİMLİ KATILAŞTIRMANIN BİRİNCİL VE İKİNCİL Al7Si0,3Mg ALÜMİNYUM ALAŞIMLARININ İÇYAPISINA ETKİSİ

Yuksel¹

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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Birincil alüminyumun üretim maliyetleri ve çevresel etkileri göz önünde bulundurulduğunda ikincil alüminyum öne çıkmaktadır. Ancak içerdiği katışkılar (inklüzyonlar) veya kirlilikler neticesinde ikincil alüminyumun da kritik parçaların üretiminde kullanılmaktan kaçınılmaktadır. Bu çalışmada titreşim altında katılaşma yapılarak bu kirliliklerin titreşimin etkisi ile yüzeye doğru yükseltilmesi ve altta kalan nihai döküm parçasının sağlam şekilde imal edilip edilemeyeceğinin bir ön araştırması yapılmıştır. Aynı zamanda titreşimin katılaşma karakteristiğine de etkisi incelenmiştir. Işık mikroskobu kullanılarak katılaşma esnasında dendritlerin morfolojisi değişimi incelenmiştir. Dendrit kolları arası mesafe ve ikincil dendrit kolları arası mesafeler ölçülmüştür.

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“…In the area of the solidification of metallic materials, ultrasonic vibration can effectively grain-refine both aluminium and magnesium alloys [3,5]. Ultrasonic melt treatment (UST) is known to induce refining effect in aluminum alloys [6][7][8][9][10][11]. The basic principle is introduction of acoustic waves with a frequency higher than 17 kHz into liquid metal.…”

Section: Introductionmentioning

confidence: 99%

The effect of magnesium doped on microstructure of aluminum alloy under ultrasonic vibration

Li¹,

Li²

2015

Proceedings of the 2015 International Conference on Materials, Environmental and Biological Engineering

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Aluminum has great application in the machinery, transportation, aviation and military and other fields, because of its light weight, rich in resources, good comprehensive properties. Structure determines the properties, in order to obtain good properties, the key is to get the fine and uniform equiaxed grain. In order to obtain the high quality aluminum alloy of fine and uniform equiaxed grain, we must control the growth of grain in the casting process. This paper mainly discusses the effect of magnesium doped on microstructure and properties of aluminum alloy under ultrasonic vibration. Adding Mg of different content for 1wt%, 3wt%, 5wt%, 7wt%, 9wt%, 15wt% in pure aluminum, respectively, then solidifying under ultrasonic vibration. The effect of different solute content on the microstructure of aluminum alloy under ultrasonic vibration is studied. The result shows that aluminum alloy containing 9wt.% magnesium can achieve the best effect of grain refinement under ultrasonic vibration.

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Formation of Microstructure in Al‐Si Alloys under Ultrasonic Melt Treatment

Cited by 18 publications

References 22 publications

The role of ultrasonic treatment in refining the as-cast grain structure during the solidification of an Al–2Cu alloy

The role of ultrasonic treatment in refining the as-cast grain structure during the solidification of an Al–2Cu alloy

TİTREŞİMLİ KATILAŞTIRMANIN BİRİNCİL VE İKİNCİL Al7Si0,3Mg ALÜMİNYUM ALAŞIMLARININ İÇYAPISINA ETKİSİ

The effect of magnesium doped on microstructure of aluminum alloy under ultrasonic vibration

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