High-purity titanium-nickel alloys with shape memory

a titanium-nickel alloy, high-purity technology, applied in the field of shape memory alloys, can solve the problems of low fatigue life, shift phase transformation temperature out of specification, variability and inconsistency in mechanical and transformation properties of the resulting alloys, and the inability to meet the requirements of use,

Inactive Publication Date: 2006-02-23
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] In one aspect the invention encompasses an alloy containing atomically equivalent amounts of nickel and titanium. The alloy

Problems solved by technology

For example, contaminants such as metallic impurities and/or gases can impair mechanical properties by forming inclusions that can lower fatigue life and can shift phase transformation temperatures out of specification.
The presence of such contaminants can also influence the effects of additional alloying elements, and can cause unpredictability, variability and incons

Method used

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Examples

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Production of a High-Purity Ni—Ti Alloy

[0026] Titanium having a 99.9997% purity and nickel having a purity of 99.997% were combined and were vacuum arc re-melted to form a Ni—Ti binary alloy containing approximately 55.8 wt % Ni. The resulting alloy had a purity of 99.997%, by weight. Purity analysis of the Ni—Ti binary alloy presented in Tables 1 and 2.

TABLE 1Ni—Ti Binary Alloy (approximately 55.8wt % Ni); Analysis of Metallic ImpuritiesMetallic Impurities*Concentration [ppm wt]Al0.69B0.01Co0.79Cr0.93Cu3.40Fe5.90Hf0.02Mg0.02Mn0.06P0.01Re0.01Si0.23V0.25W8.40Zr1.00OthersTotal metallic impurities21.72

*Measurement technique GDMS

[0027]

TABLE 2Ni—Ti Binary Alloy (approximately 55.8wt % Ni); Analysis of Gas ContaminantsLECO AnalysisConcentration [ppm wt]O99C33N1SH2

[0028] Processing in accordance with the invention can additionally include various thermo-mechanical processing steps, including but not limited to, forging, rolling, drawing, and annealing. The described thermo-mechanical p...

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Abstract

The invention includes an alloy containing equivalent amounts of nickel and titanium. The alloy has shape memory and a metallic purity of at least about 99.995%, and comprises less than about 200 ppm of gases. The invention also includes an alloy comprising titanium and nickel where the titanium and nickel amounts are non-equivalent. The alloy has shape memory and has a metallic purity of at least 99.995%, and contains less than about 200 ppm of gases. The invention further includes a method of producing a shape memory alloy. Titanium is provided having a metallic purity of at least 99.999% and nickel is provided having a metallic purity of at least 99.99%. The titanium and nickel are combined utilizing at least one melting event independently selected from e-beam melting, vacuum arc melting, vacuum induction melting, induction skull melting and plasma melting.

Description

RELATED PATENT DATA [0001] This patent claims benefit of priority under 35 U.S.C. §119 to U.S. Provisional Patent Ser. No. 60 / 514,317, which was filed Oct. 24, 2003.TECHNICAL FIELD [0002] The invention pertains to shape memory alloys and methods of producing shape memory alloys. BACKGROUND OF THE INVENTION [0003] Shape memory materials are materials which can recover a shape after heating. The shape memory properties of shape memory alloys such as, for example, nickel-titanium based shape memory alloys, can overlap with super-elastic properties. Super-elastic properties which exist over a temperature range specific to the particular material allow shape memory materials to have great flexibility. The unique properties of shape memory alloys make them particularly useful for applications in fields such as automotive, aerospace, thin-film, robotics, and medical fields. Exemplary applications for these materials include implantable medical devices, precision tools and medical instrumen...

Claims

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Application Information

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IPC IPC(8): C22C19/03
CPCC22F1/006C22C19/03C22C14/00
Inventor LOVE, DAVID B.TURNER, STEPHEN P.XU, YUNCAWLEY, EDWARD F.
Owner HONEYWELL INT INC
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