Unlock instant, AI-driven research and patent intelligence for your innovation.

Shape memory alloy with ductility and a process of making the same

a memory alloy and ductility technology, applied in vacuum evaporation coatings, sputtering coatings, coatings, etc., can solve the problems of ti--ni alloys with excessive ti, poor mechanical properties, brittleness, etc., and severely deteriorate the mechanical properties of the material

Inactive Publication Date: 2002-10-10
ISHIDA AKIRA +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these Ti--Ni alloys with lower transformation temperature has been put to practical use, the Ti--Ni alloy with excessive Ti has so poor mechanical properties and is so brittle that, in fact, it has not been used so far.
Once a usual ingot material is subjected to high temperature, Ti.sub.2Ni phases are preferentially precipitated at grain boundaries which are stable in energy and this precipitation severely deteriorates mechanical properties of the material.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Shape memory alloy with ductility and a process of making the same
  • Shape memory alloy with ductility and a process of making the same
  • Shape memory alloy with ductility and a process of making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Using a target of a Ti--Ni alloy, an amorphous thin film consisting of a Ti-48.3 atomic % Ni alloy with the thickness of about 7 .mu.m was formed on a glass substrate. The alloy thin film was annealed within a temperature range of 600.about.900K and then cooled down to room temperature slowly. A structure of the alloy thin film after annealing was observed by an electron microscope. FIG. 1 and FIGS. 2a and 2b are photos of a typical structure. In the alloy thin film subjected to annealing at 773K for 5 minutes, as shown in FIG. 1, a slight amount of oxides are confirmed at grain boundaries, but Ti.sub.2Ni phases are scarcely precipitated. The same structure as this is confirmed in the alloy thin film annealed at 873K for 3 minutes, as shown in FIG. 2a. On the contrary, in an alloy thin film subjected to annealing at 873K for an hour, as shown in FIG. 2b, precipitate of wedged-shaped Ti.sub.2Ni phases is observed at grain boundaries, especially at triple points of grain bounda...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
shapeaaaaaaaaaa
ductilityaaaaaaaaaa
Login to View More

Abstract

A Ti-Ni shape memory alloy with ductility, including Ti of 50~66atomic % in a composition, and in which precipitation of Ti2Ni phases at grain boundaries is suppressed.

Description

[0001] The present invention relates to a Ti--Ni shape memory alloy and a making process of the same. More particularly, the present invention relates to a new Ti--Ni shape memory alloy which is excellent in mechanical properties with which the Ti--Ni shape memory alloy can be put to practical use as an actuator for micro machines such as a micro valve. The present invention also relates to a making process of the Ti--Ni shape memory alloy.DESCRIPTION OF THE PRIOR ART[0002] A Ti--Ni alloy has been known as a shape memory alloy. A making process in which the Ti--Ni shape memory alloy is produced as a thin film has also been known. Besides, it has been known that a Ti--Ni alloy with excessive Ti, the amount of which is 50.about.66 atomic % in a composition, has higher R-phase transformation temperature than those of Ti--Ni alloys either with excessive Ni in a composition or with a composition in which Ti and Ni have an equal atomic ratio.[0003] While these Ti--Ni alloys with lower tra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C22C14/00C22C30/00C22F1/00C23C14/18
CPCC22C14/00C23C14/185C22F1/006C22C30/00
Inventor ISHIDA, AKIRAMIYAZAKI, SHUICHI
Owner ISHIDA AKIRA