Solidification of aluminium alloys under ultrasonic irradiation using water-cooled resonator

Абрамов, В. О.; Abramov, O. V.; Bulgakov, Volodymyr; Sommer, F.

doi:10.1016/s0167-577x(98)00064-0

Cited by 131 publications

(72 citation statements)

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“…The α-Al grains seem to be altered by UV to make a finer spherical shape. This occurrence was similarly reported in the previous work [8]. Figure 3 presents the crystal orientation maps (IPF) examined by the EBSD analysis.…”

Section: Methodssupporting

confidence: 86%

“…Furthermore, the high hardness was obtained for ADC6 at the high amplitude of the vibration (240 V). From this result, it may be considered that the ultrasonic vibration can enhance the hardness level, which is similarly reported in a previous study by Abramov et al [8]. They reported that the high hardness is obtained for the high purity aluminum with the UV treatment, which is about 14% higher than that for the related sample before the UV process [8].…”

Section: Methodssupporting

confidence: 84%

“…The effect of the UV process during the casting process on material properties in 7050 aluminum alloy was examined [7], and a finer microstructure that made a high-strength alloy was obtained. It was also considered that pure metals have poorer ultrasonic tractability than their alloys, while very high purity aluminum substantially refines the microstructure, resulting in better mechanical properties [8]. The UV treatment has not only been an advantage to make excellent solidification structures, but has also reduced defects, e.g., pores.…”

Section: Introductionmentioning

confidence: 99%

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Material Properties of Various Cast Aluminum Alloys Made Using a Heated Mold Continuous Casting Technique with and without Ultrasonic Vibration

Okayasu

Miyamoto

Morinaka

2015

Metals

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This work was carried out to develop high-quality cast aluminum alloys using a new casting technology. For this purpose, commercial Al alloys were created by heated mold continuous casting (HMC) with ultrasonic vibration (UV). With the HMC process, the grain size and the crystal orientation of the Al alloys were controlled, i.e., fine grains with a uniformly organized lattice formation. In addition, an attempt was made to modify the microstructural formation by cavitation. These microstructural characteristics made excellent mechanical properties. Using UV in the continuous casting process, more fine and spherical grains were slightly disordered, which was detected using electron backscattered diffraction. The mechanical properties of the UV HMC Al alloys were slightly higher than those for the related cast Al alloys without UV. Moreover, the severe vibration caused higher mechanical properties. The lattice and dislocation characteristics of the cast samples made with and without UV processes were analyzed systematically using electron backscattered diffraction.

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Section: Methodssupporting

confidence: 86%

Section: Methodssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Material Properties of Various Cast Aluminum Alloys Made Using a Heated Mold Continuous Casting Technique with and without Ultrasonic Vibration

Okayasu

Miyamoto

Morinaka

2015

Metals

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“…Thus, previous work [2,3,4,5,6,7] show two effects -a decrease in dendritic spacing and an increase in cooling rate with vibration during solidification. However, very limited experimental work if any was done on the effects of vibration during solidification on the cooling rate independent of any other effects.…”

Section: Introductionmentioning

confidence: 83%

“…Mechanisms for grain refinement under ultrasonic vibrations have been proposed, for example, by Eskin [6] and Abramov et al [7]. "They are related to ultrasonically induced cavitations, which produce large instantaneous pressure and temperature fluctuations in the melt.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Vibration Effects on Heat Transfer during Solidification of Paraffin in a Spherical Shell

Vadasz

Meyer

Govender

et al. 2015

Experimental Heat Transfer

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Two effects that have been observed when metals and metal alloys are vibrated during solidification are a decrease in dendritic spacing, which directly affects density, and faster cooling rates and associated solidification times. Because these two effects happen simultaneously during solidification it is challenging to determine the one effect independently from the other. Most previous studies were on metals and metal alloys. In these studies, the one effect, i.e. the decrease in dendritic spacing, might influence the other, i.e. the faster cooling rates, and vice versa. The direct link between vibration and heat transfer has not yet been studied independently. The purpose of this study was to experimentally investigate the effect of vibration only on heat transfer and thus solidification rate. Experiments were conducted on paraffin wax, because it had a clearly defined macroscopic crystal structure consisting of mostly large straight-chain hydrocarbons. The advantage of the large straight-chain hydrocarbons was that the dendritic spacing was not affected by the cooling rate.Experiments were done with paraffin wax inside hollow plastic spheres of 40 mm 2 diameter with 1 mm wall thickness. The paraffin wax was initially in a liquid state at a uniform temperature of 60°C and then submerged into a thermal bath at a uniform constant temperature of 15°C, which was approximately 20°C below the mean solidification temperature of the wax. Experiments were conducted in approximately 300 samples, with and without vibration at frequencies varying from 10 -300 Hz.The first set of experiments were conducted to determine the solidification times. In the second set of experiments, the mass of wax solidified was determined at discrete time steps, with and without vibration. The results showed that paraffin wax had vibration independent of solid density contrary to other materials, eg. metals and metal alloys. Enhancement of heat transfer resulted in quicker solidification times and possible control over the heat transfer rate. The increase in heat transfer leading to faster solidifcation times was observed to first occur, as frequency increased and then to decrease.

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Melt Flow and Grain Refinement in Al‐Si Alloys Solidified Under the Influence of Applied Electric Currents

Zhang

Räbiger

Eckert

2015

TMS2015 Supplemental Proceedings

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Solidification of aluminium alloys under ultrasonic irradiation using water-cooled resonator

Cited by 131 publications

References 1 publication

Material Properties of Various Cast Aluminum Alloys Made Using a Heated Mold Continuous Casting Technique with and without Ultrasonic Vibration

Material Properties of Various Cast Aluminum Alloys Made Using a Heated Mold Continuous Casting Technique with and without Ultrasonic Vibration

Experimental Study of Vibration Effects on Heat Transfer during Solidification of Paraffin in a Spherical Shell

Melt Flow and Grain Refinement in Al‐Si Alloys Solidified Under the Influence of Applied Electric Currents

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