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An apparatus to grain refine metals and alloys with mold vibrations
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10.1063/1.2083127
/content/aip/journal/rsi/76/10/10.1063/1.2083127
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/10/10.1063/1.2083127

Figures

Image of FIG. 1.
FIG. 1.

Schematic representation of the pneumatic ball vibrator used to generate low frequency vibration of the mold: (a) front view and (b) side view.

Image of FIG. 2.
FIG. 2.

Schematic representation of the experimental set-up developed to vibrate the metal upon solidification: (a) front view and (b) top view. The designation of main vibration axis is indicated.

Image of FIG. 3.
FIG. 3.

Transverse vibrations amplitude and peak acceleration as a function of the vertical position on the beam. The mold/vibrator distance is maintained constant at .

Image of FIG. 4.
FIG. 4.

Acceleration of mold vibrations as a function of the mold/vibrator distance for an input pressure of 2.8, 4.1, and 5.5 bar: (a) longitudinal axis and (b) transverse axis.

Image of FIG. 5.
FIG. 5.

(a) Amplitude and (b) frequency of longitudinal vibrations as a function of the mold/vibrator distance.

Image of FIG. 6.
FIG. 6.

As-cast structure of AZ91D alloy cast (top) without and (bottom) with mold vibrations.

Image of FIG. 7.
FIG. 7.

As-cast structure of pure magnesium cast (top) without and (bottom) with mold vibrations.

Image of FIG. 8.
FIG. 8.

Improved setup to separate the base plate of the apparatus from the ground. The gap between the bolts and the base plate is exaggerated for clarity.

Tables

Generic image for table
Table I.

Unloaded frequency and force output of the pneumatic ball vibrator as a function of pressure input (Ref. 12)

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/content/aip/journal/rsi/76/10/10.1063/1.2083127
2005-10-06
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An apparatus to grain refine metals and alloys with mold vibrations
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/10/10.1063/1.2083127
10.1063/1.2083127
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