Hypereutectic Al-Si based alloys with a thixotropic microstructure produced by ultrasonic treatment

Абрамов, В. О.; Abramov, O. V.; Straumal, Boris B.; Gust, W.

doi:10.1016/s0261-3069(97)00072-1

Cited by 82 publications

(38 citation statements)

References 2 publications

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“…The rapid cooling [12][13][14][15] method and the application of ultrasonic wave vibration [16][17][18][19][20] are considered as two effective alternatives to obtain fined microstructures, without adding other elements. By using the former method, very fine microstructures on the micro-and nanoscales, or amorphous phase can be achieved in thin ribbons or atomized powders due to the necessity of achieving enormously high cooling rate.…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement of Tough Pitch Copper by Electromagnetic Vibrations during Solidification

et al. 2006

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Electromagnetic vibrations, which are generated by simultaneous imposition of a static magnetic field and an alternating electric field, were applied to the refinement of crystal grains of tough pitch copper. The electromagnetic vibrations of the frequency range from 100 Hz to 10 kHz were imposed during solidification of the copper rod. Within this frequency range, the vibration frequency of about 100 Hz was found to be the most effective in refining the copper crystal grains and the average grain size was refined up to 200 mm, which otherwise was around 600 mm in a nonvibrated specimen. It was concluded that by the electromagnetic vibration process tough pitch copper could also be refined as well as Al-Si alloys and AZ91D alloys.

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Section: Introductionmentioning

confidence: 99%

Grain Refinement of Tough Pitch Copper by Electromagnetic Vibrations during Solidification

et al. 2006

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“…As microstructural refinement methods, rapid cooling, 1,2) addition of refiners [3][4][5][6][7][8] and application of ultrasonic wave vibrations [9][10][11][12] are considered. However, the use of refiners has some problems in that refiner materials are often expensive and the recycling of used materials becomes difficult.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Intensity and Frequency of Electromagnetic Vibrations on Refinement of Primary Silicon in Al-17%Si Alloy

et al. 2004

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Electromagnetic vibrations, which are the interaction between a static magnetic field and an alternating electric field, were applied to the structural refinement of Al-17%Si hyper-eutectic alloy. The relationship between the intensity and frequency of the electromagnetic vibrations and the refinement of primary silicon particles is quantitatively investigated. In the frequency range from 10 Hz to 30 kHz, the vibration frequency near 1 kHz was most effective for the refinement of silicon particles, and silicon particles of sizes up to approximately 5 mm were refined at that frequency. The level of refinement increased with increasing the intensity of electromagnetic vibrations. A primary silicon particle was sufficiently refined with a magnetic field intensity of only approximately 1.6 Tesla (T).

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“…With this process, hydrogen bubbles were removed, the primary silicon particles were refined, the α-Al dendritic crystal was formed with an equiaxial crystal, and the eutectic lamellar spacing increased. A similar approach using hypereutectic Al-Si alloys was carried out by Abramov et al [4]. In their study, primarily Si plates were disconnected and broken, forming spheriodized crystals under ultrasonic treatment, which made alloys with high plasticity and high strength.…”

Section: Introductionmentioning

confidence: 89%

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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Hypereutectic Al-Si based alloys with a thixotropic microstructure produced by ultrasonic treatment

Cited by 82 publications

References 2 publications

Grain Refinement of Tough Pitch Copper by Electromagnetic Vibrations during Solidification

Grain Refinement of Tough Pitch Copper by Electromagnetic Vibrations during Solidification

Effect of the Intensity and Frequency of Electromagnetic Vibrations on Refinement of Primary Silicon in Al-17%Si Alloy

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

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