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.

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.

Thixocasting of Al-7%Si Alloy Billets Prepared by Ultrasonic Treatment

2016 ◽  
Vol 256 ◽  
pp. 276-281
Author(s):  
Waleed Khalifa ◽  
Yoshiki Tsunekawa
Keyword(s):  
Ultrasonic Treatment ◽  
Melt Treatment ◽  
Intermetallic Particles ◽  
Eutectic Si ◽  
Feedstock Production ◽  
Dendritic Microstructures ◽  
Ultrasonic Melt Treatment ◽  
Highly Uniform

The feasibility of using the ultrasonic melt treatment to prepare billets for thixocasting process of hypoeutectic Al-7%Si alloys was studied in this paper. The work covered the billet preparation, soaking treatments and thixocasting process, with focus on the microstructural features in each case. The results showed that the use of ultrasonic treatment in billet preparation resulted in highly uniform, fine and non-dendritic microstructures. Billets with globule sizes as small as 58 µm, and roundness of more than 0.7 were obtained by ultrasonic melt treatment. Different soaking conditions before thixocasting were done and the optimum from which was the soaking for 5 min at 580°C, which resulted in thixocast parts with excellent combination of fine globules of 80 µm and roundness of 0.7 - 0.81. The eutectic Si, as well, was greatly refined by the ultrasonic thixocasting process. Furthermore, high-Fe ultrasonic treated billets, which were thixocasted successfully, exhibited Fe-intermetallic particles in highly desirable fine compacted form. These results reveal the feasibility and competence of UST as a potential route for feedstock production.

Effect of Ultrasonic Melt Treatment on Solidification Structure of Fe-36Ni Invar Alloy

2013 ◽  
Vol 32 (5) ◽  
pp. 459-465 ◽  
Author(s):  
Hong-bing Peng ◽  
Wei-qing Chen ◽  
Yan-chong Yu ◽  
Hong-guang Zheng
Keyword(s):  
Ultrasonic Treatment ◽  
Solidification Process ◽  
Ultrasonic Cavitation ◽  
Solidification Structure ◽  
Invar Alloy ◽  
Pouring Temperature ◽  
Melt Treatment ◽  
Different Temperatures ◽  
Ultrasonic Melt Treatment ◽  
Average Size

AbstractThe effect of ultrasonic treatment on the solidification structure of Fe-36Ni invar alloy was investigated. The experiment results showed that the ultrasonic treatment before its solidification had no significant effect on the solidification structure. However, when ultrasonic was inputted into the molten alloy during its solidification process, the primary dendrites were broken up into lots of fragments and solidification structure was refined significantly. When ultrasonic treatment was applied in the melt doped with yttrium before its solidification, ultrasonic cavitation could break up precipitates into many small ones, which could refine its solidification structure as nucleation cores. In samples containing yttrium treated by ultrasonic at 1753 K, the number of the precipitates was 623/mm2 and its average size was 2.18 µm; while at 1803 K, they were 604/mm2 and 2.34 µm respectively. The ultrasonic cavitation had a similar effect at two different temperatures. The solidification structure refined greatly at 1753 K was due to its low pouring temperature.

Effect of Ultrasonic Treatment on the Grain Refinement and Mechanical Properties of AZ91 Magnesium Alloy

2012 ◽  
Vol 710 ◽  
pp. 463-468 ◽  
Author(s):  
Pramod Bhingole ◽  
Gajanan Chaudhari
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Ultrasonic Vibration ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Intermetallic Phase ◽  
Ultrasonic Vibrations ◽  
Az91 Magnesium Alloy ◽  
Average Grain Size ◽  
Az91 Magnesium

The present study examines the microstructural evolution and mechanical properties of AZ91 magnesium alloy solidified under high intensity ultrasonic treatment (UST). High intensity ultrasonic vibrations were introduced isothermally below the liquidus temperature into the solidifying AZ91 alloy for the refinement of primary α-Mg grains and β-Mg17Al12intermetallic phase.Various microstructures were produced using different intensity of ultrasonic vibration at a constant temperature and fixed duration of UST. Without any ultrasonic treatment, the structure contains dendrites of primary α-Mg phase which are coarser and non-uniform in size. Nearly uniform, equiaxed grains with continuous and uniform network of intermetallic phase segregated along the grain boundaries were obtained in alloy subjected to high intensity ultrasonic vibration. The average grain size in this case decreased drastically from 300 μm for (without UST) to 17 μm (with UST at intensity of 4 kW/cm2). Vickers hardness also increased steadily with increase in ultrasonic intensity. The mechanisms for microstructural refinement are discussed and it is concluded that the fine uniform grain structure achieved under ultrasonic vibrations is attributed to the cavitation and the acoustic flow induced by ultrasonic vibrations.

Study on Effort of Ultrasonic Treatment on Water Retention Value of Pulp Fiber

2014 ◽  
Vol 1030-1032 ◽  
pp. 458-461
Author(s):  
Quan Xiao Liu ◽  
Dan Xi Li ◽  
Wen Cai Xu
Keyword(s):  
Ultrasonic Treatment ◽  
Processing Time ◽  
Water Retention ◽  
Wood Pulp ◽  
Pulp Fiber ◽  
Ultrasonic Power ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Absorbent Cotton ◽  
Coniferous Wood

Effects of ultrasonic processing conditions on water retention value of bleaching coniferous wood pulp fibers, absorbent cotton pulp fiber and straw pulp fiber were discussed. Results showed that ultrasonic power and processing time have an significant impact on water retention value of three kinds of pulp, the effort of ultrasonic treatment temperature on water retention value of three kinds of pulp is less. The water retention value of bleaching coniferous wood pulp fibers, absorbent cotton pulp fiber and straw pulp fiber, respectively, reach the maximum at power of 300W, 500W, 400W, and processing time of 60min, 120min, 60min.

ULTRASONIC PROCESSING OF RABIES VIRUS SUSPENSION FOR OBTAINING ANTIGEN-CONTAINING PREPARATIONS FOR DIAGNOSTIC TEST SYSTEMS

2020 ◽  
pp. 222-223
Author(s):  
V. Klyukina ◽  
O. Anisina
Keyword(s):  
Diagnostic Test ◽  
Rabies Virus ◽  
Ultrasonic Treatment ◽  
Processing Time ◽  
Maximum Yield ◽  
Ultrasonic Processing ◽  
Virus Suspension ◽  
Test Systems

The effect of ultrasonic treatment of a virus-containing suspension on the purity of the rabies virus antigenic preparations was studied. It was found that the maximum yield of free of tissue and culture proteins virus is observed when processing 10-20% of the virus-containing suspension at a temperature not exceeding 8-10°C, processing time 3-5 min and a frequency of 30-40 kHz.

Study on Electromagnetic Vibration Casting (EVC) of Magnesium Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 207-210
Author(s):  
Qi Chi Le ◽  
Shi Jie Guo ◽  
Zi Qiang Zhang ◽  
Jian Zhong Cui ◽  
Z.Z. Zhao
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Vibration Frequency ◽  
Large Diameter ◽  
High Quality ◽  
Light Alloys ◽  
Electromagnetic Vibration ◽  
Dc Casting ◽  
Vibration Casting ◽  
Solidification Microstructures

Electromagnetic Vibration Casting (EVC) is a new effective technical processing for optimizing solidification microstructures of light alloys. In this paper, this technology was induced into magnesium alloy DC casting for providing high-quality large diameter billets. The effects of vibration frequency and current intensities on the microstructures of large diameter billets were investigated. The results indicate that electromagnetic vibration would refine grains and the reduce macrosegregation effectively.

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.

Sign in / Sign up

Export Citation Format

Share Document