Shape-memory alloy and shape-memory alloy wire

A technology of memory alloy and alloy wire, which is applied in the field of shape memory alloy and shape memory alloy wire, and can solve problems such as lack of biocompatibility

Active Publication Date: 2020-10-20
TOKYO INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Ni-Ti-based alloys are materials that lack biocompatibility (the most important characteristic in the medical field) because they contain Ni, which is the main cause of metal allergies.

Method used

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  • Shape-memory alloy and shape-memory alloy wire
  • Shape-memory alloy and shape-memory alloy wire
  • Shape-memory alloy and shape-memory alloy wire

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0069] first embodiment : In this embodiment, a shape memory alloy wire rod made of an Au-25at%Cu-25at%Al alloy was produced. In addition, in the production of the shape memory alloy wire, it was examined whether the alloy wire can be produced while adjusting the heat treatment conditions and the like.

[0070] First, an Al wire with a wire diameter of 1.5 mm (purity 99.99%) was inserted into an Au-Cu alloy tube (outer diameter 3.53 mm, inner diameter 2.5 mm) of an Au-33.33 atomic % Cu alloy (Au-13.89 mass % Cu alloy), Extrusion processing was performed to produce a cored pipe with an outer diameter of 2.6 mm. According to the ratio of the cross-sectional area of ​​the Au-Cu alloy tube to the cross-sectional area of ​​the Al wire in the transverse section of the cored tube, the apparent composition is Au-25 atomic % Cu-25 atomic % Al alloy (Au-13.12 mass % Cu-5.57 mass % Al alloy).

[0071] The cored tube (Au-33.33 atomic % Cu alloy / Al tube: wire diameter: 2.6 mm) produced...

no. 2 approach

[0094] second embodiment : In this embodiment, shape memory alloy wires made of Au—Cu—Al alloys with various compositions were manufactured, and their respective characteristics were evaluated.

[0095] The manufacturing method of the alloy wire in this embodiment is the same as that of the first embodiment. Here, an Al wire rod (purity: 99.99%) with a wire diameter of 1.5 mm was inserted into an Au-Cu alloy tube (outer diameter: 3.53 mm, inner diameter: 2.5 mm) with adjusted Cu concentration, and extruded to produce a cored tube. Brushed processing. Here, too, the composition of the alloy wire is set in advance, and the ratio of the cross-sectional area of ​​the Au—Cu alloy tube in the cored tube to the cross-sectional area of ​​the Al wire is adjusted so that the apparent composition is consistent.

[0096] The wire drawing was repeated until the wire diameter became 100 μm so that the area reduction rate per pass became 10%. The temperature of the wire drawing process w...

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Abstract

A shape-memory alloy comprises an Au-Cu-Al alloy containing 20-40 at% of Cu and 15-30 at% of Al, with the remainder being Au and unavoidable impurities, and has a Vickers hardness of at most 360 Hv. The Au-Cu-Al alloy is able to exhibit both biocompatibility and a shape-memory effect, and further can provide an artifact-free effect in a magnetic environment. The Au-Cu-Al alloy can be produced by heating, at 500-700 DEG C, a clad material obtained by combining a hollow material made of an Au-Cu alloy with a core material made of metallic aluminum.

Description

technical field [0001] The present invention relates to shape memory alloys and shape memory alloy wires suitable as medical materials. Specifically, it relates to a Ni-free shape memory alloy, and also relates to a shape memory alloy and a shape memory alloy wire material free from artifacts in a magnetic field environment. It also relates to a shape memory alloy capable of lowering the transformation point and becoming a superelastic alloy. Background technique [0002] Conventionally, shape memory alloys have been used in the medical field. A shape memory alloy refers to a metal alloy that has the characteristic of being able to return to its original shape even when subjected to a large deformation at a temperature above the transformation point. Also, among shape memory alloys, alloys having a phase transition point in the vicinity of the normal temperature range are called superelastic alloys. It is expected that these shape memory alloys and superelastic alloys wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/02C22C30/00C21D9/52A61C7/00A61C8/00A61C13/267A61F2/86A61L31/02A61M25/00A61M25/09C22F1/14C22F1/00
CPCC22C5/02C22F1/14A61C7/00A61C8/00A61C13/267A61F2/86A61M25/00A61M25/09C22F1/00C22F1/006A61L2400/16A61L31/14A61L31/022A61L29/14A61L29/02A61L27/50A61L27/047A61L2430/12
Inventor 细田秀树海濑晃后藤研滋
Owner TOKYO INST OF TECH
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