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US 8,216,398 B2Granted
Method for controlling phase transformation temperature in metal alloy of a device
AssigneeSaint Louis University
InventorsJohn Gary Bledsoe, Berton Roy Moed, Dongfa Li
Life of this patent
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Abstract
An efficient method to reduce product wastes due to inaccurate transformation temperatures for shape memory products and parts, which provides a useful method for optimizing shape memory alloys phase transformation temperatures and mechanical properties by using heat treatment procedures below 250 degrees C. for extended dwell times.
Claims8
A heat treatment process for lowering the transformation
- temperature of an alloy comprising the steps of:
- providing a shape memory alloy forged into a preliminary structure and at least 25% cold working the preliminary structure into a primary product;
- high temperature heat treating the primary product formed in a shape of a first configuration for a duration of less than 120 minutes and establishing a preliminary Af;
- and
- low temperature heat treating the primary product formed in the shape of said first configuration for a duration of greater than 40 hours and establishing a final Af lower than said preliminary Af.
2 more elements
Dependencies are inferred from the claim text.