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Superplastic Alloy Mold

IP.com Disclosure Number: IPCOM000092003D
Original Publication Date: 1968-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Travieso, R: AUTHOR [+2]

Abstract

Superplastic alloys such as 80% ZN - 20% AL undergo large plastic deformation at very low strength. A mold for plastic prototype parts is made by pressing a pattern made of steel or any other suitable material into the alloy while it is in the superplastic condition. These three steps are used.

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Superplastic Alloy Mold

Superplastic alloys such as 80% ZN - 20% AL undergo large plastic deformation at very low strength. A mold for plastic prototype parts is made by pressing a pattern made of steel or any other suitable material into the alloy while it is in the superplastic condition. These three steps are used.

An alloy ingot 2 inches wide, 6 1/2 inches long, and 1 inch high is homogenized by first heating it in air for 12 hours at 345 degrees C and then allowing it to air cool. The ingot is then solution heat-treated for one hour at 315 degrees C and water quenched. The superplastic behavior is observed after the alloy is heated above the eutectoid temperature of 275 degrees C, cooled rapidly to suppress the eutectoid transformation, and subsequently tested in the range of 270 degrees to 275 degrees C. If the above temperature is exceeded, the superplastic properties of the material are impaired. The mold is made by pressing the pattern into the preconditioned superplastic material from step 2 with a 50-ton platen press under a maximum pressure of 700 psi at a temperature of 271 degrees C. Five minutes is required to imbed the pattern in the mold material under the preceding conditions.

The mechanical properties of a mold made in this manner are improved by heating the mold for one hour at 371 degrees C and then slowly cooling it in air.

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