Erosion resistance and performance characteristics of niobium ultrasonic sonotrodes in molten aluminum

Komarov, Sergey V.; Кузнецов, Денис

doi:10.1016/j.ijrmhm.2012.04.004

Cited by 25 publications

(8 citation statements)

References 18 publications

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“…In the study of the cavitation erosion mechanism by ultrasonic treatment in the aluminum melt, Komarov [33] and Dong [34] indicated that ultrasonic cavitation could destroy the sample surface in a very short time and cause an increase in the surface roughness. Moreover, Dong conducted further research on the erosion mechanism of Ti alloy rods in an Al-alloy and found a phenomenon of suspected plastic deformation of the sample at the node position between the two strong cavitation regions.…”

Section: Fast Crushing Periodmentioning

confidence: 99%

Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy

Zhang

et al. 2018

Metals

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Oxide films or inclusions can reduce the continuity and integrity of materials and they always lead to a significant reduction in the mechanical properties of an aluminum alloy. They can greatly reduce the plastic flow behavior of materials, thus affecting the subsequent processing performance. Therefore, an effective ultrasonic assisted preparation technology has been applied to industrial manufacturing of large-scale aluminum alloy ingots (with diameter: Φ = 1250 mm and height: h = 3750 mm). However, the mechanisms of ultrasonic purification on the large-scale ingots are not clear. Therefore, a number of aluminum alloy casting experiments were carried out to produce a conventional hot top semi-continuous ingot (CHTI) and an ultrasonic hot top semi-continuous ingot (UHTI) in this work. The microstructures of CHTI and UHTI were analyzed by optical microscopy (OM) and scanning electron microscopy (SEM). The results indicated that there were some oxide film defects in the CHTI but some finely dispersed inclusion particles were discovered in the UHTI. The X-ray diffraction (XRD) data showed that the component of inclusion was Al2O3. According to the different cavitation effects of the different areas of the molten aluminum, the process of ultrasonic purification was divided into three periods and the mechanisms in each period were separately studied.

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Section: Fast Crushing Periodmentioning

confidence: 99%

Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy

Zhang

et al. 2018

Metals

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“…Special experiments on the stability of metallic sonotrodes in liquid aluminium showed that Nb and its alloys have advantage over Fe-, Ti-and Mo-based materials. 2,6,31 The recent promising development in sonotrode materials is the use of ceramics, e.g. Sialon-based.…”

Section: Selection Of Equipment and Materialsmentioning

confidence: 99%

“…Special experiments on the stability of metallic sonotrodes in liquid aluminium showed that Nb and its alloys have advantage over Fe-, Ti- and Mo-based materials. 2,6,31…”

Section: Typical Mistakes and Misconceptionsmentioning

confidence: 99%

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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“…Hence, the contact area between two adjacent layered platelets and the van der Waals force of attraction between them is higher, [9] UST-assisted dispersion of 2D layered platelets is further complicated due to the large wavelength of cavitation as compared to the interlayer distance. For example, the wavelength of ultrasonic cavitation from a 6 mm niobium (Nb) probe at 20 kHz is about 100 mm, [10] whereas the interlayer distance between 2D layered platelets is a few micrometers. [11] The probability of large wavelength rarefaction pulses penetrating these small gaps and deagglomerating adjacent platelet layers is thus significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Role of Ultrasonic Treatment on Microstructure, Multiscale Mechanical, and Tribological Behavior of 2D Tungsten Disulfide Reinforced Aluminum Composites

et al. 2022

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This article is the first report on the role of ultrasonic treatment (UST) on microstructural evolution, multiscale mechanical behavior, and tribological response in 2D tungsten disulfide (WS2) reinforced aluminum (Al6061) matrix composites. Delaunay triangulation calculations show that UST for 45 s enables a fourfold enhancement in the dispersion parameter of WS2 reinforcements in the Al6061 matrix from 0.08 to 0.32. Improved WS2 dispersion contributes to higher nucleation density with 52.7% grain refinement efficiency, achieving a fine‐grained Al6061–WS2 composite. The role of UST‐induced 2D reinforcement dispersion on the elastic deformation is established at progressively increasing length scales from individual grains to the bulk composite. It is accomplished by integrating the nanodynamic modulus mapping technique with a finite element modeling framework built on experimentally acquired microstructures and localized elastic moduli. It delineates a directly proportional relationship between UST‐induced dispersion and elastic modulus enhancement at all length scales from 10 to 700 μm. Excellent dispersion of the 2D layered WS2 homogenizes the tribological response of the composite material with a tenfold reduction in the volume of material lost during wear.

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Erosion resistance and performance characteristics of niobium ultrasonic sonotrodes in molten aluminum

Cited by 25 publications

References 18 publications

Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy

Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy

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

Role of Ultrasonic Treatment on Microstructure, Multiscale Mechanical, and Tribological Behavior of 2D Tungsten Disulfide Reinforced Aluminum Composites

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