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

A memory alloy and alloying technology, applied in the field of shape memory alloys, can solve the problems of difficulty in preparing thin films with a thickness of less than 100 μm, high cost, and limited width, and achieve good cold deformation ability, low cost, good shape memory effect and plasticity. Effect

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

However, due to the brittleness of NiTiHf alloy with high Hf content, it is difficult to prepare films with a thickness of less than 100 μm by conventional cold rolling. To prepare a film with a thickness of less than 100 μm, it is necessary to go through tedious repeated cold rolling and annealing, which is expensive
The sputtering method is commonly used to prepare NiTiHf alloy thin films, but limited by the thickness and size of the prepared materials, this method is not suitable for general-purpose materials.
There is also a method of rapid quenching of melt to prepare NiTiHf alloy film, but its width is limited

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the designed composition formula Ni 0.5 (Ti 0.9 f 0.1 ) 0.5 , using Ni foil with a thickness of 0.100mm and Ti-10Hf (atomic percentage) alloy foil with a thickness of 0.166mm as raw materials, stacking 10 layers according to the stacking method of {Ni / TiHf}. First cold rolling to 1.000mm with a deformation of 62%, 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 Ni 0.5 (Ti 0.8 f 0.2 ) 0.5 , using Ni foil with a thickness of 0.100mm and Ti-20Hf (atomic percentage) alloy foil with a thickness of 0.170mm as raw materials, stacking 10 layers according to the stacking method of {Ni / TiHf}. First cold rolling to 1.000mm with a deformation of 63%, and then cold rolling to 0.060mm, the cold rolled film is folded and overlapped, and then cold rolled to 0.060mm, 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 376K by electrical resistance method, and the shape was completely recovered after being heated with 4% tensile deformation at room temperature.

Embodiment 3

[0025] According to the designed composition formula Ni 0.5 (Ti 0.6 f 0.4 ) 0.5 , using Ni foil with a thickness of 0.100mm and Ti-40Hf (atomic percentage) alloy foil with a thickness of 0.180mm as raw materials, stacking 10 layers according to the stacking method of {Ni / TiHf}. First cold rolling to 1.000mm with a deformation of 64%, and then cold rolling to 0.060mm, the cold rolled film is folded and overlapped, and then cold rolled to 0.060mm, repeating 10 passes. Finally, the cold-rolled 10-pass film was kept at 1173K for 20 hours for alloying. The Ms point of the alloy was determined to be 575K by the electrical resistance method, and the shape was completely recovered after heating at room temperature with a tensile deformation of 4%.

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Abstract

This invention discloses a method of preparing NiTiHf shape memory alloy thin film through cold rolling ultrathin lamination alloying. Good plasticity, easy deformed Ni foil, Ti foil, Hf foil or TiHf alloy foil are materials, foil thickness is defined according to atom constitution formula NiX (Ti1-yHf1-y)1-X. metal foils are alternating laid, sandwich structure is got after big deformation cold rolling, it is repeated again and again, finally components uniform alloy film is got after diffusion annealing alloying. The reactant ratio is 0.04íœxíœ0.55, 0íœyíœ0.8. 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 NiTiHf 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 high mechanical properties. 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 nickel-titanium alloy: Ni-Ti; 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): B21B1/40B21B3/00C22C14/00C22C19/03C22C28/00C22C30/00C22F1/00
Inventor 文玉华李宁莫华强谢文玲
Owner SICHUAN UNIV
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