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

A memory alloy and alloying technology, applied in the field of shape memory alloy, can solve the problems of film width limitation and unsuitability for industrial production, etc., and achieve the effects of low-cost performance, good cold deformation ability, and high fatigue life

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

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the designed composition formula (percentage by weight): Al 14.5%, Ni 5%, and the balance is copper. Al foil with a thickness of 0.100 mm and Cu-5.85Ni (weight percent) alloy foil with a thickness of 0.178 mm are used as raw materials, and 10 layers are stacked alternately. 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 873K for 40 hours for diffusion alloying. The alloyed film was reheated to 973K, kept warm for 0.5 hours and water quenched. The Ms point of the alloy was determined to be 141K by the resistance method, and it was bent by 6% at the temperature of liquid nitrogen, and the shape was completely restored after heating.

Embodiment 2

[0018] According to the designed composition formula (percentage by weight): Al 13%, Ni 4%, and the balance is copper. Al foil with a thickness of 0.100 mm and Cu-4.65Ni (weight percent) alloy foil with a thickness of 0.200 mm are used as raw materials, and 10 layers are stacked alternately. First cold rolled to 1.000mm with a deformation of 67%, and then cold rolled to 0.080mm. Fold the cold-rolled film in half, and then cold-roll to 0.080mm, repeating this 10 times. Finally, the cold-rolled 10-pass film was kept at 900K for 30 hours for diffusion alloying. The alloyed film was reheated to 1073K, kept warm for 0.3 hours and water-quenched. The Ms point of the alloy was determined to be 406K by the resistance method. It was bent by 6% at room temperature, and the shape was completely restored after heating.

Embodiment 3

[0020] According to the designed composition formula (percentage by weight): Al 12%, Ni 5%, Mn 2%, and the balance is copper. Al foil with a thickness of 0.100 mm and Cu-5.58Ni-2.27Mn (weight percent) alloy foil with a thickness of 0.220 mm are used as raw materials, and 10 layers are stacked alternately. First cold rolled to 1.600mm with a deformation of 50%, and then cold rolled to 0.100mm. Fold the cold-rolled film in half, and then cold-roll to 0.100mm, repeating this 10 times. Finally, the thin film cold-rolled for 10 passes was kept at 923K for 20 hours for diffusion alloying. The alloyed film was heated to 1173K, kept warm for 0.25 hours and water-quenched. The Ms point of the alloy was determined to be 434K by the resistance method. It was bent by 6% at room temperature, and the shape was completely recovered after heating.

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Abstract

The invention opened a method to make CuAlNiMn shape-memory alloy firm by the cold-roll ultrathin laminated alloy. The process use the Al foil, CuNiMn alloy foil as the material and decide the thickness according to the the composition. The foil is interactively overlapped and cold-rooled to form the ultrathin laminated alloy. The CuAlNiMn alloy firm is consists of Al11.5-14.5%, Ni 0-5%, Mn 0-3%, the remain is Cu. 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 CuAlNiMn 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, easy control of components and high mechanical properties. technical background [0002] CuAlNi shape memory alloy not only has low price, but also has better aging stability and thermal stability than CuZnAl alloy. Compared with NiTi and CuZnAl based shape memory alloy, CuNiAl alloy can also be used under the condition of 200 ℃. 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 below 100°C. In many practical applications, such as early warning and automatic protection systems for fire or overheating situations, satellite launch towers, rocket engines, current overload protectors and other devices, shape m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/40B21B3/00C22C1/00C22C9/01C22F1/08
Inventor 文玉华李宁李东谢文玲
Owner SICHUAN UNIV
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