Chemically induced superplastic deformation

Details Chemically induced superplastic deformation Chemically induced superplastic deformation

1997-03-19

2000-03-28

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148669, C22F 100

Patent

active

060426616

ABSTRACT:
The invention produces superplastic deformation in a workpiece by altering the chemical composition of the workpiece material, while the workpiece is subjected to a biasing stress, in a manner that introduces a strain increment into the material that effects a change in a overall dimension of the workpiece without causing failure. In one approach, repeated cyclic alteration of chemical composition, so as to repeatedly alternately induce and reverse a phase transition that produces strain increment, allows accumulation of strain in an incremental fashion thereby achieving large overall superplastic deformations in the workpiece without applying large stresses.

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F.H. Froes et al., "Thermochemical Processing of Titanium Alloys," Journal of Metals, 26-47 (1990).
O.N. Senkov et al., "Recent Advances in the Thermohydrogen Processing of Titanium Alloys," Journal of Metals, 42-47 (1996).

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