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Method for preparing NiAl shape memory alloy film by cold rolling ultra-thin laminated alloy foil

A memory alloy and alloying technology, which is applied in the field of shape memory alloy, can solve the problems of film width limitation and unsuitability for industrial production, and achieve good shape memory effect and plasticity, good cold deformation ability, and high fatigue life.

Inactive Publication Date: 2005-09-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain a NiAl alloy film with a thickness less than 100 μm, the film is limited by its width and is not suitable for industrial production.

Method used

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  • Method for preparing NiAl shape memory alloy film by cold rolling ultra-thin laminated alloy foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the designed composition formula Ni 0.63 Al 0.37 , using Ni foil with a thickness of 0.180mm and Al foil with a thickness of 0.160mm as raw materials, and 10 layers are alternately stacked. First cold rolling to 1.200mm with a deformation of 65%, and then cold rolling to 0.080mm, the cold rolled film is folded and overlapped, and then cold rolled to 0.080mm, and so on for 10 passes. Finally, the cold-rolled 10-pass film was kept at 773K for 50 hours for alloying. The alloyed film was reheated to 1373K, kept warm for 0.5 hours and quenched in water. The Ms point of the alloy was determined to be 271K by the resistance method, and the shape was completely restored after bending at 243K with 3% heating.

Embodiment 2

[0022] According to the designed composition formula Ni 0.635 Al 0.365 , using Ni foil with a thickness of 0.140mm and Al foil with a thickness of 0.122mm as raw materials, and 10 layers are alternately stacked. First cold rolling to 1.000mm with a deformation of 62%, and then cold rolling to 0.080mm, the cold rolled film is folded and overlapped, and then cold rolled to 0.080mm, and so on for 10 passes. Finally, the cold-rolled 10-pass film was kept at 873K for 30 hours for alloying. The alloyed film was reheated to 1423K, kept warm for 0.3 hours and water quenched. The Ms point of the alloy was determined to be 342K by the resistance method, and the shape was completely recovered after being bent at room temperature by 3% and heated.

Embodiment 3

[0024] According to the designed composition formula Ni 0.64 Al 0.36 , using Ni foil with a thickness of 0.140mm and Al foil with a thickness of 0.119mm as raw materials, and 10 layers are alternately stacked. First cold rolling to 0.800mm with a deformation of 69%, and then cold rolling to 0.050mm, the cold rolled film is folded and overlapped, and then cold rolled to 0.050mm, and so on for 10 passes. Finally, the cold-rolled 10-pass film was kept at 923K for 20 hours for alloying. The alloyed film was reheated to 1473K, kept warm for 0.25 hours and water quenched. The Ms point of the alloy was determined to be 419K by the resistance method, and the shape was completely recovered after being bent at room temperature by 3% and heated.

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Abstract

This invention discloses a method of preparing NiAl shape memory alloy thin film through cold rolling ultrathin lamination alloying. Good plasticity, easy deformed Al foil, Ni foils are materials, and foil thickness is defined according to atom constitution formula Ni1-XAlX. Metal foils are alternating laid, sandwich structure is got after big deformation cold rolling, it is repeated again and again, and finally components uniform alloy film is got after diffusion annealing alloying. The reactant ratio is 0.30íœxíœ0.40. The film components made by this method is easy control, crystal grain is small, fatigue life is high, area is large and cost is low.

Description

technical field [0001] The invention relates to the field of shape-memory alloys, in particular to a method for preparing NiAl shape-memory alloy films by cold-rolling ultra-thin lamination alloying. The thin film prepared by the method has the advantages of simple production process, easy control of components and good mechanical properties. technical background [0002] Most of the shape memory alloys used today are affected by their thermoelastic martensitic phase transition temperature, and their working temperatures are mostly lower than 100°C. There is particular interest and demand for high temperature shape memory alloys with higher phase transition temperatures. Therefore, the research and development of high-temperature shape memory alloys has considerable engineering application prospects, and will definitely help to upgrade automation and self-adaptive capabilities in the field of engineering technology in the next century. [0003] At present, the high-tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/40B21B3/00C22C1/00C22C19/03C22C21/00
Inventor 文玉华李宁熊隆荣胥永刚
Owner SICHUAN UNIV
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