Experimental Study of Grain Growth in Aluminium Melts under the Influence of Ultrasonic Melt Treatment

2007 ◽  
Vol 561-565 ◽  
pp. 987-990 ◽  
Author(s):  
T.V. Atamanenko ◽  
Dmitry G. Eskin ◽  
Laurens Katgerman
Keyword(s):  
Aluminium Alloys ◽  
Structure Refinement ◽  
Die Casting ◽  
Ultrasonic Processing ◽  
Cu Alloy ◽  
Melt Treatment ◽  
Final Microstructure ◽  
First Results ◽  
Ultrasonic Melt Treatment

It was shown on laboratory and industrial scale that ultrasonic melt treatment (UST) significantly refines structure of aluminium alloys and improves the quality of castings. However, despite considerable efforts which have been made over decades in the field of ultrasonic processing of aluminium melts, quite a few problems remain unclear. One of them is addressed in this project. The aim of the project is to understand which mechanism is responsible for cavitation-aided grain refinement. It is expected that the knowledge gained as a result of this work can be used in directchill, shape and die casting. The paper describes an experimental setup and first results on the correlation between parameters of UST, solidification conditions and degree of structure refinement. In separate experiments, a model Al-Cu alloy with different amount of solidification sites is solidified with and without UST. The final microstructure is analyzed.

scholarly journals Study of ultrasonic melt treatment on the quality of horizontal continuously cast Al–1%Si alloy

2006 ◽  
Vol 13 (2) ◽  
pp. 121-125 ◽  
Author(s):  
Xin-tao Li ◽  
Ting-ju Li ◽  
Xi-meng Li ◽  
Jun-ze Jin
Keyword(s):  
Melt Treatment ◽  
Continuously Cast ◽  
Ultrasonic Melt Treatment

Effect of ultrasonic melt treatment on structure refinement of solidified high purity aluminum

2014 ◽  
Vol 24 (7) ◽  
pp. 2414-2419 ◽  
Author(s):  
Hai-jun HUANG ◽  
Yi-fan XU ◽  
Da SHU ◽  
Yan-feng HAN ◽  
Jun WANG ◽  
...  
Keyword(s):  
High Purity ◽  
Structure Refinement ◽  
Melt Treatment ◽  
High Purity Aluminum ◽  
Ultrasonic Melt Treatment

Ultrasonic Treatment of Magnesium Alloy Melts and its Effects on Solidification Microstructures

2007 ◽  
Vol 546-549 ◽  
pp. 129-132 ◽  
Author(s):  
Zi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Processing Time ◽  
Ultrasonic Processing ◽  
Ultrasonic Power ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment ◽  
Solidification Microstructures

The effects of high intensity ultrasonic melt treatment on the microstructure of magnesium alloys were investigated in this paper. Magnesium melts were treated with power ultrasonic wave and then cooled to a predetermined temperature. With the increase in ultrasonic power, the structure exhibited refined and spheroidzed crystal grains. After further increasing the ultrasonic power, the grains tended to somewhat coarsened. And increasing the ultrasonic processing time led to a grain refinement of magnesium alloy.

scholarly journals Structure Refinement Upon Ultrasonic Melt Treatment in a DC Casting Launder

JOM ◽  
2020 ◽  
Vol 72 (11) ◽  
pp. 4071-4081
Author(s):  
Tungky Subroto ◽  
Dmitry G. Eskin ◽  
Christopher Beckwith ◽  
Ivan Skalicky ◽  
Dan Roberts ◽  
...  
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Particle Density ◽  
Structure Refinement ◽  
Direct Chill ◽  
Treatment Quality ◽  
Number Density ◽  
Melt Treatment ◽  
Dc Casting ◽  
Ultrasonic Melt Treatment

Abstract This work focuses on ultrasonic melt treatment (UST) in a launder upon pilot-scale direct chill (DC) casting of 152-mm-diameter billets from an AA6XXX alloy with Zr addition. Two casting temperatures (650°C and 665°C) were used to assess their effect on the resulting microstructure (grain size, particle size, and number density). Structure refinement results show the feasibility of UST in the DC casting launder. This is quantified through the corresponding reduction of grain size by around 50% in the billet center, or more towards the billet surface, reduction of the average Al3Zr particle size, and increase in the particle number density. A higher Al3Zr particle density was obtained when the alloy was cast at 665°C. Numerical simulation results and suggestions on how to improve the treatment quality of UST in DC casting launder are also provided.

scholarly journals Ultrasonic processing of aluminium alloys above the liquidus: the role of Zr

2020 ◽  
Vol 326 ◽  
pp. 06002
Author(s):  
Dmitry Eskin
Keyword(s):  
Solid Solution ◽  
Aluminium Alloys ◽  
Eutectic Reaction ◽  
Structure Refinement ◽  
Al Alloys ◽  
Melt Processing ◽  
Ultrasonic Processing ◽  
Solution Type ◽  
Primary Crystals

Ultrasonic melt processing (USP) is gaining quite an interest in recent years due to the benefits of this technology to the melt quality and structure refinement. A number of mechanisms have been identified that govern the effects of USP at different stages of melt processing. Technologically it is advantageous to apply USP to the fluid melt rather than to a mushy solidifying alloy. In this case heterogeneous nucleation on available or activated/multiplied substrates is the main mechanism. Among these substrates, primary crystals of Al3Zr phase were shown to be potent and effective. This paper gives a review of the own research into the role of Al3Zr in structure refinement in various groups of Al alloys, from solid-solution type to hypereutectic. This overview includes the evidence of a possible eutectic reaction between Al and Al3Zr in Al-rich alloys, mechanisms of Al3Zr formation and refinement under USP (that enables these primary crystals to be active substrates for Al and some other primary phases), the role of USP in facilitating primary solidification of Al3Zr in the Al-Zr system, and the additional benefits of solute Ti presence. The paper is illustrated with the data obtained over the last 15 years of research led by the author.

Effect of Ultrasonic Treatment on Microstructures of Mg-Ca Binary Alloy

2010 ◽  
Vol 139-141 ◽  
pp. 677-680
Author(s):  
Zhi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
Magnesium Alloys ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Processing Time ◽  
Ultrasonic Processing ◽  
Ultrasonic Power ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment

The effects of high intensity ultrasonic melt treatment on the microstructure of magnesium alloys were investigated in this paper. Magnesium melts were treated with power ultrasonic wave and then cooled to a predetermined temperature. With the increase in ultrasonic power, the structure exhibited refined and spheroidzed crystal grains. After further increasing the ultrasonic power, the grains tended to somewhat coarsened. Increasing the ultrasonic processing time led to a grain refinement of magnesium alloy.

Effect of Ultrasonic Melt Treatment on Degassing and Structure of Aluminium Alloys

2013 ◽  
Vol 765 ◽  
pp. 271-275 ◽  
Author(s):  
Noe Alba-Baena ◽  
Thomas Pabel ◽  
Natalia Villa-Sierra ◽  
Dmitry G. Eskin
Keyword(s):  
Ultrasonic Processing ◽  
Structure Modification ◽  
Reduced Pressure ◽  
Environment Friendly ◽  
X Ray ◽  
Melt Treatment ◽  
Direct Measurements ◽  
Foundry Alloys ◽  
Ultrasonic Melt Treatment ◽  
Kinetics Of

Ultrasonic processing is known to be an efficient means of aluminium melt degassing and structure modification with additional benefits of being economical and environment friendly. This paper reports on the kinetics of ultrasonic degassing effect of foundry alloys. Direct measurements of hydrogen concentration in the melt by Foseco Alspek-H probe are used along with the reduced-pressure test. The effects of ultrasonic processing on structure, i.e. grain size and porosity, are studied using metallography and 3D X-ray tomography. This work is performed within the Ultragassing project funded by the European Union’s 7th Framework Program.

Effect of ultrasonic melt treatment on the tribological behavior of 7075 aluminum alloy

2020 ◽  
Vol 62 (12) ◽  
pp. 1243-1250
Author(s):  
Fahri Vatansever ◽  
Alpay Tamer Erturk ◽  
Erol Feyzullahoglu
Keyword(s):  
Aluminum Alloy ◽  
Tribological Behavior ◽  
7075 Aluminum Alloy ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment

’Propylene glycolate’ used as a top coat seal to protect thick juice from degradation in ellipsoidal storage tanks

2013 ◽  
pp. 215-218
Author(s):  
Robert O. Hatch ◽  
Craig M. Giles ◽  
Jay S. Creiglow ◽  
David R. Smith
Keyword(s):  
Propylene Glycol ◽  
Barrier Layer ◽  
Chemical Properties ◽  
Polypropylene Glycol ◽  
Storage Tanks ◽  
First Results ◽  
Thick Juice

The use of sodium propylene glycol for thick juice storage was investigated at Spreckels Sugar Company, in Brawley, California (USA). Sodium-polypropylene glycol has a density of 1.07 and does not mix with thick juice. Therefore it is suitable as a barrier layer. Chemical properties of propylene glycol, and the deposition on the top of thick juice are described. First results of the last campaign are compared with data from previous years. A significantly lower tendency in the reduction of the quality of the thick juice was found.

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