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Production of TiNiPd 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 difficulty in preparing thick thin films, unsuitability, etc., and achieve the effects of good cold deformation ability, good shape memory effect, plasticity and high performance.

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

However, due to the brittleness of TiNiPd alloy, it is difficult to prepare films with a thickness less than 100 μm by conventional cold rolling.
The sputtering method is now widely used to prepare TiNiPd alloy thin films, but limited by the thickness and size of the prepared materials, this method is not suitable for general-purpose materials.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the designed composition formula Ti 0.5 (Ni 0.6 PD 0.4 ) 0.5 , Ti foil with a thickness of 0.140mm and Ni-40Pd (atomic percentage) alloy foil with a thickness of 0.100mm are used as raw materials, and 10 layers are stacked according to the stacking method of {Ti / NiPd}. First cold rolling to 1.200mm with a deformation of 50%, 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 973K for 50 hours for alloying. The Ms point of the alloy was determined to be 366K by electrical resistance method, and the shape was completely recovered after heating at room temperature with a tensile deformation of 6%.

Embodiment 2

[0022] According to the designed composition formula Ti 0.5 (Ni 0.5 PD 0.5 ) 0.5 , Ti foil with a thickness of 0.110mm and Ni-50Pd (atomic percentage) alloy foil with a thickness of 0.080mm are used as raw materials, and 10 layers are stacked according to the stacking method of {Ti / NiPd}. First cold rolling to 0.950mm with a deformation of 50%, 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 30 hours for alloying. The Ms point of the alloy was determined to be 476K by electrical resistance method, and the shape was completely recovered after being heated with 4% tensile deformation at room temperature.

Embodiment 3

[0024] According to the designed composition formula Ti 0.5 (Ni 0.4 PD 0.6 ) 0.5 , Ti foil with a thickness of 0.160mm and Pd-40Ni (atomic percentage) alloy foil with a thickness of 0.120mm are used as raw materials, and 10 layers are stacked according to the stacking method of {Ti / NiPd}. First cold rolling to 1.400mm with a deformation of 50%, 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 1173K for 20 hours for alloying. The Ms point of the alloy was determined to be 511K by electrical resistance method, and the shape was completely recovered after being heated with 4% tensile deformation at room temperature.

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Abstract

The invention opened thea. method to make TiNiPd shape-memory alloy firm by the cold-roll ultrathin laminated alloy. The method is to use the Ti foil, Ni foil or NiPd as the material, and decidethe thickness according to the Tix(Ni1-yPdy)1-x. The foil is interactively overlapped and cold-rooled to form the ultrathin laminated alloy. The content satisfies 0.48<=x<=0.5; 0.4<=y<=0.8 respectively. The alloy firm has the good features of fine crystal, long life, big area and low cost.

Description

technical field [0001] The invention relates to the field of shape-memory alloys, in particular to a method for preparing TiNiPd 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, high shape memory effect and high mechanical properties. technical background [0002] At present, the relatively mature shape memory alloys are TiNi alloy and CuZnAl alloy. However, the Ms point of NiTi and CuZnAl-based shape memory alloys is generally not higher than 100°C, so they can only be used at temperatures lower than 100°C. In many practical applications, such as early warning and automatic protection systems for fire or overheating, satellite launch towers, rocket engines, current overload protectors and other devices, shape memory alloys need to be used at higher temperatures, especially In nuclear reactor engineering, it is required that the operatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/40B21B3/00C22C1/00C22C11/00C22C14/00C22C19/03C22C30/00C22F1/00
Inventor 文玉华李宁莫华强李东
Owner SICHUAN UNIV
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