Coherent nanodispersion-strengthened shape-memory alloys
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United States of America Patent
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Jan 8, 2008
Grant Date -
Sep 30, 2004
app pub date -
Mar 25, 2004
filing date -
Mar 25, 2003
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Abstract
High-strength, low-hysteresis TiNi-based shape-memory alloys (SMAS) employing fully coherent low-misfit nanoscale precipitates, wherein the precipitate phase is based on an optimized composition for high parent-phase strength and martensite phase stability, and compensating the stored elastic energy through the addition of martensite stabilizers. The alloys, with a yield strength in excess of 1200 MPa, are useful for applications such as self-expanding stents, automotive actuators, and other applications wherein SMAs with high output force and long cyclic life are desired.
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