Production of TiNiCu shape memory alloy thin membrane by cold rolling superthin laminated alloy

A memory alloy and alloying technology, applied in the field of shape memory alloys, can solve the problems of film production, cold rolling, width limitation, etc., and achieve the effects of easy control, high fatigue life and accurate composition

Inactive Publication Date: 2005-07-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, when the Cu content is higher than 10 at%, the alloy becomes brittle, and the conventional casting and rolling process cannot produce thin films
In order to overcome the shortcoming that high Cu content TiNiCu alloy is brittle and cannot be cold-rolled, sputtering method is generally used to prepare TiNiCu alloy thin film, but limited by the thickness and size of the prepared material, this method is not suitable for general-purpose materials
There is also a method of rapid quenching of melt to prepare TiNiCu alloy film, but its width is limited

Method used

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  • Production of TiNiCu shape memory alloy thin membrane by cold rolling superthin laminated alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the designed composition formula Ti 0.5 (Ni 0.9 Cu 0.1 ) 0.5 , Ti foil with a thickness of 0.168mm and 0.100mm Ni-10Cu (atomic percentage) alloy foil are alternately placed in 10 layers. First cold rolling to 1.000mm with a deformation of 63%, and then cold rolling to 0.050mm, the cold rolled film is folded and overlapped, and then cold rolled to 0.050mm, repeating 10 passes. Finally, the cold-rolled 10-pass film was kept at 973K for 50 hours for alloying. The Ms point of the alloy was determined to be 341K by electrical resistance method, and the shape recovered completely after being heated with 6% tensile deformation at room temperature.

Embodiment 2

[0023] According to the designed composition formula Ti 0.5 (Ni 0.8 Cu 0.2 ) 0.5 , Ti foil with a thickness of 0.168mm and 0.100mm Ni-20Cu (atomic percentage) alloy foil are alternately placed in 10 layers. First cold rolling to 1.000mm with a deformation of 63%, and then cold rolling to 0.050mm, the cold rolled film is folded and overlapped, and then cold rolled to 0.050mm, repeating 10 passes. Finally, the cold-rolled 10-pass film was kept at 1073K for 40 hours for alloying. The Ms point of the alloy was determined to be 326K by electrical resistance method, and the shape recovered completely after heating at room temperature with a tensile deformation of 6%.

Embodiment 3

[0025] According to the designed composition formula Ti 0.5 (Ni 0.6 Cu 0.4 ) 0.5 , Ti foil with a thickness of 0.168mm and 0.100mm Ni-40Cu (atomic percentage) alloy foil are alternately placed in 10 layers. First cold rolling to 1.000mm with a deformation of 63%, and then cold rolling to 0.050mm, the cold rolled film is folded and overlapped, and then cold rolled to 0.050mm, repeating 10 passes. Finally, the cold-rolled 20-pass film was kept at 1173K for 20 hours for alloying. The Ms point of the alloy was determined to be 323K by electrical resistance method, and the shape was completely recovered after heating at room temperature with a tensile deformation of 6%.

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Abstract

The invention was involved in the method to preparation of TiNiCu shaped memory alloy firm by cold roll ultrathin lamination alloying. Using Ti foil, Ni foil, Cu foil and NiCu foil as the rough material which has good plastic nature that easy to distortion. The thickness of foil determined according to Tix(Nil-yCuy)1-x. The foils were placed by mutual overlap, and the ultrathin sandwich structure formed by cool roll. The ultrathin structure was repeated cool rulled. The foil that has a homogeneous ingredient was gained after diffusion annealing. The ingredient has the quality of 0.45<=x<=0.55, 0<=y<=0.6. Its advantages: ingredients easy to be controlled and has a small crystal grain; has a long endurance life, a large area and a low cost.

Description

technical field [0001] The invention relates to the field of shape-memory alloys, in particular to a method for preparing TiNiCu shape-memory alloy thin films by alloying cold-rolled ultra-thin layers. The thin film prepared by the method has the advantages of simple production process, fine grain, high fatigue life, large area and low cost. technical background [0002] The shape memory effect means that a deformed material can fully or partially return to its original undeformed shape when heated above a certain temperature. Alloys with this effect are called shape memory alloys, which are a new type of functional material that integrates perception and actuation. So far, dozens of alloys with shape memory effect have been found, but the shape memory alloys with good application value can be divided into three categories according to their composition: ① titanium-nickel alloy: Ti-Ni; ② copper-based alloy: Cu-Zn-Al, Cu-Al-Ni; ③ Iron-based alloys: Fe-Mn-Si, Fe-Ni-Co-Ti. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/40B21B3/00C22C1/00C22C30/00C22F1/00
Inventor 文玉华李宁熊隆荣胥永刚
Owner SICHUAN UNIV
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