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Ti-Ni-based shape-memory alloy and method of manufacturing same

Inactive Publication Date: 2001-07-26
KAJIWARA SETABUO +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conventional technique has problems such that the improving effect of shape-memory properties is not sufficient, that the above-mentioned method for improving these properties requires strict control of the chemical composition of the Ti--Ni-based alloy, and furthermore, that two-stage heat treatments are required.
Under such circumstances, therefore, it is very difficult even to obtain a limited improvement of shape-memory properties and to reduce the manufacturing cost.

Method used

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  • Ti-Ni-based shape-memory alloy and method of manufacturing same
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  • Ti-Ni-based shape-memory alloy and method of manufacturing same

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[0028] Using a Ti--Ni target material, thin films of an amorphous Ti--Ni alloy containing 48.2 atomic % Ni were formed on a glass substrate by argon ion sputtering. The thickness of the films was about 7 .mu.m and its composition was determined by electron probe X-ray microanalysis.

[0029] A thin film heat-treated at 745 K for 1 hr was observed by means of a high-resolution electron microscope. FIG. 1 illustrates an example of electronmicrograph thereof. FIG. 2 is an enlarged micrograph thereof. As is known from the micrographs of FIGS. 1 and 2, a number of thin plate precipitates are produced and distributed in the parent phase. These precipitates appear along the {100}bcc plane of the parent phase bcc(B2 type), and take the form of a disk having a thickness of about 0.5 nm (2 to 3 lattice planes) and a radius of from about 5 to 10 nm. The precipitates are distributed at intervals of about 10 nm, i.e., in a nanometer scale. The precipitate was confirmed to be Ti-rich by EDS analysis...

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Abstract

To remarkably improve shape-memory properties without the need for strictly controlling the composition, the present invention provides a Ti-Ni-based shape-memory alloy having a titanium content within a range of from 50 to 55 atomic %, which comprises an amorphous alloy heat-treated at a temperature of from 600 to 800 K, in which subnanometric precipitates generating coherent elastic strains are formed and distributed in the bcc parent phase(B2).

Description

[0001] This is a divisional of Ser. No. 08 / 768,467, filed Dec. 18, 1996.[0002] The present invention relates to a Ti--Ni-based shape-memory alloy and a method of manufacturing same. More particularly, the present invention relates to a novel Ti--Ni-based shape-memory alloy which is useful as an actuator for a micro-valve or a micro-machine without the need for a strict control of composition and which has a largely improved shape-memory property, and a method of manufacturing same.PRIOR ART AND PROBLEMS[0003] As an alloy having shape-memory properties, Ti--Ni-based alloy has conventionally been known. A method of manufacturing this Ti--Ni-based alloy into a thin-film alloy is also known.[0004] The thin-film shape-memory alloy is expected to be applicable to various precision areas. In the case of Ti--Ni-based shape-memory alloy thin film, a method for improving shape-memory properties such as shape recovering ability and recovery strain is known, which comprises crystallizing an amo...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22F1/10C22C14/00C22C19/03C22C45/04C22C45/10C22F1/00C22F1/18
CPCC22C14/00C22C45/04C22C45/10C22F1/006Y10S977/891
Inventor KAJIWARA, SETSUOKIKUCHI, TAKEHIKOOGAWA, KAZUYUKIMIYAZAKI, SHUICHIMATSUNAGA, TAKESHI
Owner KAJIWARA SETABUO