Structure of aluminum castings produced by directed crystallization in ultrasonic fields

Попов, А. В.; Zamorkina, I. A.; Смирнов, Андрей

doi:10.1007/bf00717494

Cited by 1 publication

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“…2,[4][5][6] This mechanism is consistent with the knowledge of Sonochemestry. [2][3][4][5] Experimental The compositions of the two investigated Mg based alloy 1 and 2 are Mg-4Zn-4Sn-1Si and Mg-1 . 6Ca-3 .…”

Section: Introductionmentioning

confidence: 99%

“…5 in hardness values. 3 More extensive work with ultrasonic melt treatment of Al alloys and Mg alloys, carried out by Eskin et al, 2,[4][5][6][7] suggests that impurities such as oxides and intermetalic phases that have a higher Tm than that of the matrix can serve as nucleation sites combined with ultrasonic melt treatment, and lead to structure refinement. The mechanism suggested by Eskin et al 2,6,8 claims that upon cavitation impulsion, crack and other inactive nucleation centres are activated when gas trapped in the cracks is released and replaced by molten alloy.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic induced structural modification in Mg alloys

Shepelev¹,

Oshri²,

Graznov³

et al. 2008

Materials Science and Technology

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Ultrasonic waves (frequency 20 kHz and maximum intensity 400 W) were applied in molten Mg alloys during solidification to a cylinder 30 mm in diameter and 100 mm long. Applying this treatment to Mg-4Zn-4Sn-1Si resulted in refinement of the dendritic structure and more uniform dispersion of the Mg 2 Sn and Mg 2 Si precipitates. The same treatment carried out on Mg-1 . 5Ca-3Zn alloy resulted in transition from dendritic solidification to equiaxed structure with a relatively uniform grain size. In addition, the formation of Mg 2 Ca was significantly suppressed.

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