Effect of ultrasonic power on grain refinement and purification processing of AZ80 alloy by ultrasonic 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.

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Ultrasonication of Thawed Huyou Juice: Effects on Cloud Stability, Physicochemical Properties and Bioactive Compounds

Foods ◽

10.3390/foods10081695 ◽

2021 ◽

Vol 10 (8) ◽

pp. 1695

Author(s):

Xinyue Zhou ◽

Wenjun Wang ◽

Xiaobin Ma ◽

Enbo Xu ◽

Donghong Liu

Keyword(s):

Physicochemical Properties ◽

Bioactive Compounds ◽

Ultrasonic Treatment ◽

Frozen Storage ◽

Titratable Acidity ◽

Soluble Solids ◽

Ultrasonic Power ◽

Minimal Impact ◽

Sedimentation Behavior ◽

Thawing Process

In order to remove the flocculent precipitation in Huyou juice after frozen storage and thawing process, the thawed juice was ultrasonically treated with different power (45–360 W) and time (10–60 min) in ice bath (~0 °C), and its sedimentation behavior during storage was observed. After optimization, the cloud stability of juice could be improved by ultrasonic treatment with ultrasonic power of 360 W or more for at least 30 min, which could be stable during 7 days of storage at 4 °C. Under this optimal condition (360 W, 30 min), the effects of ultrasound on the physicochemical properties and bioactive compounds of thawed Huyou juice during storage were investigated. The results showed that with smaller particle size and lower polymer dispersity index, ultrasonic treatment did not significantly change the color, soluble solids, titratable acidity, and bioactive compounds including flavonoids and other phenolics. In addition, all properties of samples were at the same level during storage. Thus, ultrasound was applicable since it can improve the cloud stability of Huyou juice with minimal impact on its physicochemical properties and nutritional quality compared to the untreated one.

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Role of ultrasonic treatment, inoculation and solute in the grain refinement of commercial purity aluminium

Scientific Reports ◽

10.1038/s41598-017-10354-6 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 26

Author(s):

G. Wang ◽

Q. Wang ◽

M. A. Easton ◽

M. S. Dargusch ◽

M. Qian ◽

...

Keyword(s):

Grain Refinement ◽

Ultrasonic Treatment ◽

Commercial Purity ◽

Purity Aluminium ◽

Commercial Purity Aluminium

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Thermal conduction characteristics of silicone composites including ultrasonic-treated graphite

Journal of Composite Materials ◽

10.1177/00219983211059582 ◽

2021 ◽

pp. 002199832110595

Author(s):

Weontae Oh ◽

Jong-Seong Bae ◽

Hyoung-Seok Moon

Keyword(s):

Thermal Conductivity ◽

Ultrasonic Treatment ◽

Thermal Conduction ◽

Light Emitting Diode ◽

Thermal Interface Material ◽

Ultrasonic Power ◽

Lighting System ◽

Thermal Interface ◽

Light Emitting ◽

Inorganic Oxides

The microstructural change of graphite was studied after ultrasonic treatment of the graphite. When the graphite solution was treated with varying ultrasonic power and time, the microstructure changed gradually, and accordingly, the thermal conductivity characteristics of the composite containing the as-treated graphite was also different with each other. Thermal conductivity showed the best result in the silicone composite containing graphite prepared under the optimum condition of ultrasonic treatment, and the thermal conductivity of the composite improved proportionally along with the particle size of graphite. When the silicone composite was prepared by using a mixture of inorganic oxides and graphite rather than graphite alone, the thermal conductivity of the silicone composite was further increased. A silicone composite containing graphite was used for LED (light emitting diode) lighting system as a thermal interface material (TIM), and the temperature elevation due to heat generated, while the lighting was actually operated, was analyzed.

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Effect of the Mg3N2 Sub-Micron Particle on the Grain Refinement of AZ80 Alloy

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.327.45 ◽

2022 ◽

Vol 327 ◽

pp. 45-53

Author(s):

Jiehua Li ◽

Maria Pammer ◽

Ernst Neunteufl ◽

Peter Schumacher

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

Grain Refinement ◽

Liquid State ◽

High Performance ◽

Great Loss ◽

Micron Particle ◽

Deformation Ability ◽

Semi Solid ◽

Az80 Alloy

AZ80 alloy has been widely used to produce high performance Mg casting and wrought parts for high-end applications due to its high mechanical properties and deformation ability. However, at least two important issues still need to be solved in order to further improve its mechanical properties and deformation ability. Firstly, the grain size of α-Mg in AZ80 alloy is relatively large (more than 1000 µm) due to a lack of efficient grain refinement methodologies. Secondly, the size of the eutectic Mg17Al12 phase is also large and the distribution of the eutectic Mg17Al12 phase is continuous, which is very harmful for the mechanical properties, in particular to elongation. In this paper, these two important issues are investigated by adding Mg3N2 sub-micron particle into AZ80 alloy and thereby refining the α-Mg and the eutectic Mg17Al12 phase. Firstly, the Mg3N2 sub-micron particle was directly added into AZ80 alloy by using mechanically stirring in the semi-solid state, subsequently the melting temperature was increased above the liquidous temperature, and finally the melting was casted in the liquid state. It was found that the grain size of α-Mg can be refined from 883.8 µm to 169.9 µm. More importantly, the eutectic Mg17Al12 phase was also refined and the distribution became discontinuous. It should be noted that directly adding the Mg3N2 sub-micron particle into AZ80 alloy leads to a great loss of the Mg3N2 sub-micron particle due to the weak wetting behavior between the Mg3N2 sub-micron particle and Mg melt. The second methodology through mixing Mg3N2 sub-micron particles with AZ91 chips using a twin extruder was also used to prepare AZ91 master alloy with 3wt.% Mg3N2 sub-micron particle, which was subsequently added into AZ80 alloy in the liquid state. In this way, a significant grain refinement of α-Mg and a simultaneous refinement of the eutectic Mg17Al12 phase in AZ80 alloy was also achieved. The grain size of α-Mg can be refined from 883.8 µm to 325.9 µm. However, no significant grain refinement by using UST was observed. Instead, the grain size increases from 325.9 µm to 448.6 µm, indicating that the Mg3N2 sub-micron particle may lose its grain refinement potency due to possible aggregation and clustering. This paper provides an efficient and simple methodology for the grain refinement of α-Mg and the simultaneous refinement of the eutectic Mg17Al12 phase in AZ80 alloy.

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Grain Refinement Of Al-Si Hypoeutectic Alloys By Al3Ti1B Master Alloy And Ultrasonic Treatment

Shape Casting: 6th International Symposium ◽

10.1002/9781119274865.ch18 ◽

2016 ◽

pp. 141-150 ◽

Cited By ~ 2

Author(s):

Gui Wang ◽

Eric Qiang Wang ◽

Arvind Prasad ◽

Matthew Dargusch ◽

David H StJohn

Keyword(s):

Grain Refinement ◽

Master Alloy ◽

Ultrasonic Treatment

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Effect of Ce Addition on Modifying the Microstructure and Achieving a High Elongation with a Relatively High Strength of As-Extruded AZ80 Magnesium Alloy

Materials ◽

10.3390/ma12010076 ◽

2018 ◽

Vol 12 (1) ◽

pp. 76 ◽

Cited By ~ 6

Author(s):

Zheng Wang ◽

Jin-Guo Wang ◽

Ze-Yu Chen ◽

Min Zha ◽

Cheng Wang ◽

...

Keyword(s):

Mechanical Properties ◽

Dynamic Recrystallization ◽

Grain Refinement ◽

High Strength ◽

Tensile Tests ◽

Area Fraction ◽

Schmid Factor ◽

High Elongation ◽

Az80 Alloy ◽

Ce Content

Forming magnesium alloys with rare earth elements (La, Gd, Nd, Y, Ce) is a routine method for modifying their microstructure and properties. In the present work, the effect of Ce addition on the microstructure evolution and the mechanical properties of as-extruded Mg-8Al-0.5Zn (AZ80) alloy was investigated. All of the extruded AZ80-xCe (x = 0, 0.2, 0.8 and 1.4 wt %) alloys exhibited equiaxed grains formed by fully dynamic recrystallization, and the grain size of the extruded AZ80 alloy was remarkably reduced by ~56.7% with the addition of 1.4 wt % Ce. Furthermore, the bulk-shaped Al4Ce phase formed when Ce was first added, with the Ce content rising to 0.8 wt % or higher, and Al4Ce particles in both the nano- and micron sizees were well distributed in the primary α-Mg matrix. The area fraction of the Al4Ce particles expanded with increasing Ce content, providing more nuclei for dynamic recrystallization, which could contribute to the grain refinement. The results of the tensile tests in this study showed that Ce addition effectively improved the room temperature formability of the as-extruded AZ80 alloy, without sacrificing strength. The significantly improved mechanical properties were ascribed to excellent grain refinement, weakened texture strength, an increased Schmid factor, and a reduced area fraction of low-angle grain boundaries, all resulting from Ce addition to the as-extruded AZ80 alloy. The contribution of the nano-Al4Ce precipitates on improving the mechanical properties was also discussed in this paper.

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Practical Considerations on the Application of Ultrasonic Treatment to Mg-Al Shape Castings

Materials Science Forum ◽

10.4028/www.scientific.net/msf.765.255 ◽

2013 ◽

Vol 765 ◽

pp. 255-259

Author(s):

Eraldo Pucina ◽

Geoff de Looze ◽

Dacian Tomus ◽

Mark A. Easton ◽

Andreas Schiffl ◽

...

Keyword(s):

Grain Size ◽

Grain Refinement ◽

Ultrasonic Treatment ◽

Solidification Front ◽

Al Alloys ◽

Grain Refining ◽

Fine Grain ◽

Effective Form

This paper investigates the use of ultrasonic treatment on the grain refinement of Mg-Al alloys in castings similar to commercial gravity castings. It shows that it is a very effective form of grain refinement but it is limited spatially and by the advancing solidification front if partially-solidified product is washed into the die. It was found that the best way to obtain a homogeneous fine grain size through-out the casting was to combine a grain refining addition, SiC, with ultrasonic treatment during the initial stages of solidification.

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