Formation of Microstructure in Al-Si Alloys Under Ultrasonic Melt Treatment

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

doi:10.1007/978-3-319-48179-1_174

Cited by 17 publications

(18 citation statements)

References 22 publications

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“…This was confirmed for primary intermetallics [17] and Si [18] as well as for primary aluminium dendrites [19]. Isothermal ultrasonic treatment in the semi-solid state results rather in grain coarsening [20].…”

Section: Main Mechanisms and Applications Of Ultrasonic Melt Processingmentioning

confidence: 63%

Ultrasonic processing of molten and solidifying aluminium alloys: Overview and outlook

Eskin

2017

Materials Science and Technology

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Abstract. Ultrasonic melt processing attracts a lot of interest both from academic researchers and industry. Despite a long history of the subject, with first accounts dating back to the 1930s, the physics, mechanisms and practical applications are still under development. In the second half of the XXth century, pilot-and industrial scale applications of ultrasonic processing of light alloys were demonstrated for melt degassing, filtration, grain refinement, melt atomisation, and zone refining. In the last 10 years the interest to ultrasonic melt processing grew with regard to understanding the underlying mechanisms of previously established effects, developing numerical models of ultrasonic cavitation and the development of nanocomposite technology. This review paper summarises the mechanisms involved in the ultrasonic melt processing, including cavitation, flows, nucleation, activation, fragmentation and their consequences for degassing, structure refinement and particle dispersion. Some typical mistakes made by researchers in performing experiments and in interpretation of the results are discussed. New advanced methods of studying ultrasonic treatment and phenomena are considered. The paper also gives an outlook to future developments and challenges.

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Section: Main Mechanisms and Applications Of Ultrasonic Melt Processingmentioning

confidence: 63%

Ultrasonic processing of molten and solidifying aluminium alloys: Overview and outlook

Eskin

2017

Materials Science and Technology

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“…Usually silicon is added to reinforce the material to achieve an improved torsion resistance, ultimate tensile strength, wear resistance and ductility as well as a reduction of the thermal expansion coefficient [3][4][5]. The eutectic point of this binary system is located at a mass fraction of 12.2% silicon and 577 • C [6,7].…”

Section: Introductionmentioning

confidence: 99%

Selective laser melting of hypereutectic Al-Si40-powder using ultra-short laser pulses

et al. 2017

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We investigate the use of ultra-short laser pulses for the selective melting of Al-Si40-powder to fabricate complex lightweight structures with wall sizes below 100 μm combined with higher tensile strength and lower thermal expansion coefficient in comparison to standard Al-Si alloys. During the cooling process using conventional techniques, large primary silicon particles are formed which impairs the mechanical and thermal properties. We demonstrate that these limitations can be overcome using ultra-short laser pulses enabling the rapid heating and cooling in a non-thermal equilibrium process. We analyze the morphology characteristics and micro-structures of single tracks and thin-walled structures depending on pulse energy, repetition rate and scanning velocity utilizing pulses with a duration of 500 fs at a wavelength of 1030 nm . The possibility to specifically change and optimize the microstructure is shown.

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“…Most likely, a combination of solute, flow and momentum effects plays role in the fragmentation. For the best effect, the ultrasonic processing should be applied continuously from above the liquidus through the upper part of the solidification range of the phase that should be refined [12][13][14].…”

Section: Grain Refinementmentioning

confidence: 99%

Ultrasonic Melt Processing: Achievements and Challenges

Eskin

2015

MSF

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Abstract. Ultrasonic melt processing of light alloys enjoys the revival in the last 15 years. Although the scientific foundation and first examples of industrial application date back to the 1950s-1970s, the technological application of ultrasound in melt and solidification processing has not been fully accomplished. In recent years, the availability of advanced reliable equipment, new basic knowledge gained through modelling and dedicated experiments, and the industrial demand for clean, environment friendly technology sparked the interest to this technology and ensuing research. This paper reports on the currently achieved level of ultrasound application in light metal processing, i.e. degassing and grain refinement of light alloys and metal-matrix composite material manufacturing, and discusses challenges that still prevent large-scale implementation, both from fundamental and applied point of view. Main mechanisms underlying the effects of ultrasonic processing such as cavitation in melts, nucleation and fragmentation of solid phases, forced convection induced by cavitation zone and acoustic streaming, and mixing and distribution of solid inclusions are explained. The paper is illustrated by examples of own research.

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Formation of Microstructure in Al-Si Alloys Under Ultrasonic Melt Treatment

Cited by 17 publications

References 22 publications

Ultrasonic processing of molten and solidifying aluminium alloys: Overview and outlook

Ultrasonic processing of molten and solidifying aluminium alloys: Overview and outlook

Selective laser melting of hypereutectic Al-Si40-powder using ultra-short laser pulses

Ultrasonic Melt Processing: Achievements and Challenges

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