Effect of Soaking Treatment on the Microstructure and Wear Behavior of the Ultrasonic Melt‐Treated B390 Hypereutectic Al‐Si Alloy

Fadl, Mona; Khalifa, Waleed; El‐Hadad, Shimaa

doi:10.1002/9781119274780.ch139

Cited by 1 publication

(1 citation statement)

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“…It also showed potential effects in refining the α-Al phase [6], the primary silicon and Fe-intermetallic phases in hypoeutectic Al-Si alloys [7]. The UST effect superseded that of phosphorous addition in Si-particle refining and its effect on wear resistance in hyper-eutectic Al-Si alloys [8,9]. The growth rates of solid globules during soaking stage were substantially low for UST-treated billets (in the order of 479-748 µm 3 /s [10]), compared to the MHD stirring (1043-3099 µm 3 /s).…”

Section: Introductionmentioning

confidence: 96%

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

Khalifa

Tsunekawa

2016

SSP

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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.

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