Microstructural evolution in ultrasonicated AS41 magnesium alloy

Effect of Ultrasonic Treatment in the Static and Dynamic Mechanical Behavior of AZ91D Mg Alloy

“…US treatment promotes a uniform dispersion in the matrix along the grain boundaries, as already demonstrated in previous works [27]. The efficiency of this refinement, caused by the effect of US, can be attributed to cavitation by two distinct mechanisms: (i) heterogeneous nucleation at high (above liquidus) temperature, and (ii) intermetallic compound fragmentation due to the streaming acoustic effect.…”

Processing, microstructure and properties of ultrasonically processed in situ MgO–Al2O3–MgAl2O4 dispersed magnesium alloy composites

“…These result in improved distribution of in situ formed hard oxide particles in the UST processed MMCs. Other work on the ultrasonic processing of MMCs supports this hypothesis [19][20][21][22]27,28].…”

“…The improvement is more in UST processed MMCs because distribution of these particles is improved, as discussed earlier. It is also well accepted that when high power ultrasound is coupled with solidifying alloys, degassing take place that results in reduction of porosity [20,27,29,33]. This may further improve the mechanical properties especially the hardness.…”

“…In this context, in situ reaction fabrication is one of the most economical and versatile approaches [17]. A novel solidification processing technique involving ultrasonic treatment (UST) assisted casting process has been developed [8,[17][18][19][20]. It is efficient in dispersing the nano particles in to the melts.…”

Synergy of nano carbon black inoculation and high intensity ultrasonic processing in cast magnesium alloys

“…Mg-Al alloys are Zr free and no potent inoculants are available in order to obtain uniform and finer grain size. Therefore, physical method of microstructure modification such as ultrasonication during solidification can prove useful [13]. In the present work, it is endeavored to systematically study the individual and combined effects of chemical (inoculation) and physical (ultrasonic vibrations) techniques on the microstructural development and mechanical properties in three commercial AZ series magnesium alloys containing varying amount (3, 6 and 9 wt pct) of Al.…”