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Metals
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Ultrasonic Processing of Alloys
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Ultrasonic Processing of Alloys

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 October 2020) | Viewed by 17204

Special Issue Editor

Prof. Dr. Youngjig Kim

E-Mail Website
Guest Editor
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Jangan-gu, Suwon, 16419, Korea
Interests: Ultrasonic melts treatment of Al alloys; Interfacial phenomena in the casting process; Alloy development of Al and Mg cast alloys; High integrity die casting processes of Al and Mg alloys; In situ synthesis of Ti matrix composites

Special Issue Information

Dear Colleagues,

Ultrasonic processing is a relatively new environmentally conscious technology with wide application in the commercial production of high-quality cast and worked alloys.

About 45 years ago, G.I. Eskin presented a variety of applications of ultrasound in cleaning, degassing, casting, deformation, and post-deformation processing of metals and alloys. Since then, research in high-power ultrasound propagation in liquid and solid metals has led to the understanding of some effects occurring at interfaces and contributed to the development of ultrasonic processing.

This Special Issue aims to address the latest research devoted to exploring the potentialities of ultrasonic processing in liquid alloys, solid alloys, and liquid-solid slurries. Advances in fundamental studies and the commercial prospects of this process to control the structure and properties of cast and worked metals are also welcome. Research articles focusing on the improvement of product quality, the development of integrated environmentally friendly, and cost-effective ultrasonic processes are encouraged as well.

Prof. Dr. Youngjig Kim
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Fundamental studies of ultrasonic processing
  • Ultrasonic processing of liquid alloys
  • Ultrasonic processing of solid alloys
  • Advanced modeling and simulation
  • Development of ultrasonic processing
  • Industrial applications of ultrasonic processing

Published Papers (4 papers)

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Research

11 pages, 3401 KiB  
Article
In Situ and Post-Mortem Characterizations of Ultrasonic Spot Welded AZ31B and Coated Dual Phase 590 Steel Joints
by Jian Chen, Yong Chae Lim, Donovan Leonard, Hui Huang, Zhili Feng and Xin Sun
Metals 2020, 10(7), 899; https://doi.org/10.3390/met10070899 - 6 Jul 2020
Cited by 6 | Viewed by 2557
Abstract
Ultrasonic spot welding using different welding conditions was applied to join dissimilar metals of galvanized DP590 steel and AZ31B magnesium sheets. In situ high-speed imaging, digital image correlation, and infrared thermography were utilized to quantitatively study the interfacial relative motion, surface indentation, and [...] Read more.
Ultrasonic spot welding using different welding conditions was applied to join dissimilar metals of galvanized DP590 steel and AZ31B magnesium sheets. In situ high-speed imaging, digital image correlation, and infrared thermography were utilized to quantitatively study the interfacial relative motion, surface indentation, and heat generation across the joint faying interface and the sheet/sonotrode interfaces under the welding condition of moderate welding power and short welding time. For welds made with high power and long welding time, lap shear tensile tests as well as fatigue tests were carried out. Different fracture modes were observed after the lap shear tensile tests and fatigue tests performed under different peak loads. Post-weld cross-sectional analysis with scanning electron microscopy coupled with energy dispersive X-Ray spectroscopy revealed the variation of morphology and chemical composition at the joint interface for welds made with different welding conditions. Full article
(This article belongs to the Special Issue Ultrasonic Processing of Alloys)
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15 pages, 7196 KiB  
Article
Microstructural Evolution and Wear Behavior of SiCp/7085 Composites Manufactured by Ultrasonic Stirring Casting
by Zhenghua Li, Ripeng Jiang, Xiaoqian Li, Xiang Jia and Lihua Zhang
Metals 2020, 10(5), 650; https://doi.org/10.3390/met10050650 - 18 May 2020
Cited by 1 | Viewed by 2125
Abstract
In this work, SiCp/7085 composites with a volume fraction of 10% were fabricated by ultrasonic stirring casting. The evolution of the microstructure and wear properties of SiCp/7085 composites, as well as the mechanism of ultrasonic action in the process of preparation, when the [...] Read more.
In this work, SiCp/7085 composites with a volume fraction of 10% were fabricated by ultrasonic stirring casting. The evolution of the microstructure and wear properties of SiCp/7085 composites, as well as the mechanism of ultrasonic action in the process of preparation, when the ultrasonic treatments last for 0 min, 5 min, 10 min, and 15 min, respectively, were studied using the optical effects (OM), scanning electron microscope (SEM), and X-ray diffraction (XRD). The experimental results show that the high temperature and high pressure formed by the cavitation of ultrasound can effectively eliminate the cluster of particles, improve the distribution of SiC particles, increase the interfacial wettability of the composites, and form MgAl2O4 and MgO on the particle surface, thereby ultimately improving the wear resistance of the composites. Because the particles in the melt are affected by the segregation effect of ultrasonic standing wave field, there exists an optimal value for the ultrasonic treatment time. When the melt is treated with the ultrasonic wave with an amplitude of 12 μm and a treatment duration of 10 min in the test conditions given in this paper, the composites have the most uniform distribution of particles, the best wear resistance, a large and stable friction coefficient, and the minimum weight loss of sample wear: 12 mg. The change of wear resistance is consistent with the variation of solidification structure and interface properties. Full article
(This article belongs to the Special Issue Ultrasonic Processing of Alloys)
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22 pages, 4704 KiB  
Article
Simulation of Ultrasonic Induced Cavitation and Acoustic Streaming in Liquid and Solidifying Aluminum
by Eric Riedel, Martin Liepe and Stefan Scharf
Metals 2020, 10(4), 476; https://doi.org/10.3390/met10040476 - 4 Apr 2020
Cited by 18 | Viewed by 8712
Abstract
Ultrasonic treatment (UST), more precisely, cavitation and acoustic streaming, of liquid light metal alloys is a very promising technology for achieving grain and structure refinement, and therefore, better mechanical properties. The possibility of predicting these process phenomena is an important requirement for understanding, [...] Read more.
Ultrasonic treatment (UST), more precisely, cavitation and acoustic streaming, of liquid light metal alloys is a very promising technology for achieving grain and structure refinement, and therefore, better mechanical properties. The possibility of predicting these process phenomena is an important requirement for understanding, implementing, and scaling this technology in the foundry industry. Using an established (casting) computational fluid dynamics (CFD)-simulation tool, we studied the ability of this software to calculate the onset and expansion of cavitation and acoustic streaming for the aluminum alloy A356, partly depending on different radiator geometries. A key aspect was a holistic approach toward pressure distribution, cavitation, and acoustic streaming prediction, and the possibility of two- and (more importantly) three-dimensional result outputs. Our feasibility analysis showed that the simulation tool is able to predict the mentioned effects and that the results obtained are in good agreement with the results and descriptions of previous investigations. Finally, capabilities and limitations as well as future challenges for further developments are discussed. Full article
(This article belongs to the Special Issue Ultrasonic Processing of Alloys)
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15 pages, 6475 KiB  
Article
Research on the Micro-Extrusion Process of Copper T2 with Different Ultrasonic Vibration Modes
by Linhong Xu, Yulan Lei, Haiou Zhang, Zhaochen Zhang, Yuchu Sheng and Guangchao Han
Metals 2019, 9(11), 1209; https://doi.org/10.3390/met9111209 - 10 Nov 2019
Cited by 13 | Viewed by 3021
Abstract
As an effective method for the fabrication of miniature metallic parts, the development of micro-forming process (MFP) is still restricted by the existence of size effect. To improve the micro-forming performance of metal material, ultrasonic vibration assisted MFP had been studied extensively for [...] Read more.
As an effective method for the fabrication of miniature metallic parts, the development of micro-forming process (MFP) is still restricted by the existence of size effect. To improve the micro-forming performance of metal material, ultrasonic vibration assisted MFP had been studied extensively for its superiorities in improving materials flow stress and reducing interfacial friction. However, from the literature available, the high frequency vibration was usually found to be superimposed on the forming tool while seldom on the workpiece. Our group developed a special porous sonotrode platform which can realize tool vibration and workpiece ultrasonic vibration independently. In this work, ultrasonic micro-extrusion experiments for copper T2 material under tool vibration and the workpiece vibration condition, respectively, were conducted for comparing the micro-forming characteristic of different vibration modes. The micro-extrusion experiment results of copper T2 show that the lower extrusion flow stress, the higher micro-extrusion formability and surface micro-hardness, and more obvious grain refinement phenomenon can be obtained under the workpiece vibration condition compared with that of tool vibration. These findings may enhance our understanding on different ultrasonic forming mechanisms and energy transmission efficiency under two different vibration modes. Full article
(This article belongs to the Special Issue Ultrasonic Processing of Alloys)
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