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Enhancement of Titanium-aluminum Alloying by Ultrasonic Treatment.
Groetsch-JG Jr.; Elkins-TH Jr.; Sorrell-CA
U S Pat 4 847 047 1989 Jul; :
A method of increasing the dissolution rate of titanium or titanium alloys in molten aluminum is disclosed that comprises placing a titanium rod into molten aluminum and applying ultrasonic energy to the rod. The ultrasonic energy enhances the dissolution of the titanium in the aluminum, homogenizes the molten alloy, and breaks up particles such as tial3 that form into a layer at the surface of the melt. The application of ultrasonic energy increases the dissolution rate of solid titanium in molten aluminum, decreases the amount of time needed to achieve homogeneity, and results in a titanium-aluminum alloy with a reduction in grain size and improved properties. For example, a ti rod immersed in molten aluminum and subjected to 500 w of ultrasonic energy at 11.1 Khz for 1 h showed a ti concentration in the aluminum of 0.19 Wt pct. For the same conditions except 1,000 w, the ti concentration was 0.50 Wt pct. For 500 w at 18.0 Khz, the ti concentration was 0.31 Wt pct, and for 1,000 w at 17.7 Khz, the ti concentration was 1.07 Wt pct. With no ultrasonic energy applied, the ti concentration in the aluminum was <0.05 Wt pct.
U.S. Pat. 4,847,047, July 11, 1989
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