Nitinol alloy design for improved mechanical stability and broader superelastic operating window
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United States of America Patent
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Dec 20, 2004
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Dec 27, 2000
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Abstract
A nickel-titanium alloy having a large, superelastic operating temperature window or range. The nickel-titanium alloy includes at least an additional element such as platinum, palladium, manganese, boron, aluminum, tungsten, and/or zirconium. When processed through heat treat and area reduction steps, the resultant alloy exhibits a wide superelastic temperature operating window if the characteristics of the alloy when plotted on a temperature versus stress curve can be expressed as UP=(0.66 ksi/.degree. C.)(T)+.sigma..sub.0, with R.sup.2.gtoreq.0.98, wherein .sigma..sub.0 is the upper plateau stress of the alloy at about 0.degree. C., R.sup.2 is the coefficient of determination, and UP is the upper plateau stress of the alloy.
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