Combined effect of high-intensity ultrasonic treatment and Ca addition on modification of primary Mg 2 Si and wear resistance in hypereutectic Mg–Si alloys

2014 ◽  
Vol 615 ◽  
pp. 576-581 ◽  
Author(s):  
M.E. Moussa ◽  
M.A. Waly ◽  
A.M. El-Sheikh
Keyword(s):  
Wear Resistance ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Combined Effect ◽  
Ca Addition

scholarly journals Improvement of Riser Efficiency Using High-Intensity Ultrasonic Treatment in A356 Alloy

2015 ◽  
Vol 56 (9) ◽  
pp. 1605-1608 ◽  
Author(s):  
Sang-Soo Shin ◽  
Woo-Chun Kim ◽  
Kyou-Hyun Kim ◽  
Jeong-Wook Park
Keyword(s):  
Ultrasonic Treatment ◽  
High Intensity ◽  
A356 Alloy

scholarly journals Bacteriostatic effects of high-intensity ultrasonic treatment on Bacillus subtilis vegetative cells

2021 ◽  
Vol 81 ◽  
pp. 105862
Author(s):  
Wei Luo ◽  
Jinqiu Wang ◽  
Yi Wang ◽  
Jie Tang ◽  
Yuanhang Ren ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Vegetative Cells

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.

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