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Polycrystalline Fe-Ni-Co-Al-Nb-B shape memory alloy with super elasticity and preparation method thereof

A fe-ni-co-al-nb-b, memory alloy technology, applied in the field of polycrystalline Fe-Ni-Co-Al-Nb-B shape memory alloy and its preparation, to achieve excellent superelasticity effect

Inactive Publication Date: 2014-01-15
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Maki et al. have developed Fe-Ni-Co-Ti shape memory alloys, but the measured recoverable strain at -33°C is only 0.7%, which is far from meeting the actual use requirements.

Method used

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  • Polycrystalline Fe-Ni-Co-Al-Nb-B shape memory alloy with super elasticity and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Example 1: The composition and corresponding atomic percentages of the polycrystalline Fe-Ni-Co-Al-Nb-B shape memory alloy with superelasticity in this example are: Fe 30.35%, Ni 30%, Co 18% , Al 10.5%, Nb 2%, B 0.15%.

[0025] The preparation process and steps are as follows: prepare 60 g of industrially pure metal raw materials Fe, Ni, Co, Al, Nb, and B according to the polycrystalline Fe-Ni-Co-Al-Nb-B shape memory alloy composition of this embodiment, and then configure The material is melted in a vacuum non-consumable electric arc furnace under the protection of argon, and the melting current density is 250A / cm 2 , the smelted alloy was turned over and smelted 4 times; the alloy ingot obtained by smelting was first hot-rolled at 1000°C into a thin plate with a thickness of 3.5mm, and then solid solution treated at 1150°C for 30min, and cold-rolled into a thin plate with a thickness of 2.5mm after water quenching; The final material was solutionized at 1250°C for 30...

Embodiment 2

[0027] Embodiment 2: The alloy composition of this embodiment is the same as that of Embodiment 1.

[0028] Its preparation process and steps are as follows: prepare 60g of the polycrystalline Fe-Ni-Co-Al-Nb-B shape memory alloy composition of the industrial pure metal raw material Fe, Ni, Co, Al, Nb, B according to the present embodiment, and use vacuum The non-consumable electric arc furnace is smelted under the protection of argon, and the smelting current density is 250A / cm 2 , the smelted alloy was turned over and smelted 4 times; the alloy ingot obtained by smelting was first hot-rolled at 1000°C into a thin plate with a thickness of 3.5mm, then solution treated at 1150°C for 30min, and cold-rolled into a thin plate with a thickness of 2.5mm after water quenching; After rolling, the material was solid-dissolved at 1250°C for 30 minutes, and then quenched in water; after solution treatment, the material was aged at 600°C for 45 hours and then air-cooled.

[0029] The p...

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Abstract

The invention relates to a polycrystalline Fe-Ni-Co-Al-Nb-B shape memory alloy with super elasticity and a preparation method thereof. The alloy comprises the following atoms: 30-50% of Fe, 28-40% of Ni, 10-30% of Co, 8-15% of Al, 1-4% of Nb and 0.1-3% of B. The preparation method of the alloy includes solid solution treatment and aging treatment. The shape memory alloy provided by the invention adopts a special alloy formula, and the preparation technology is simple and controllable. The shape memory alloy provided by the invention has significantly increased recoverable strain with the maximum recoverable strain reaching 10.5%, and shows excellent super elasticity.

Description

technical field [0001] The invention relates to the technical field of iron-based shape memory alloy materials, in particular to a polycrystalline Fe-Ni-Co-Al-Nb-B shape memory alloy with superelasticity and a preparation method thereof. Background technique [0002] Shape memory alloys came out in the early 1860s and are functional materials that combine temperature sensing and driving. Because of its good shape memory effect (SMA), superelasticity (SE) and other properties, it is widely used in the fields of electronics, machinery, aviation and medical treatment. Among them, superelasticity can make the alloy absorb more energy without permanent deformation during the loading-unloading process. This characteristic can be used to make dampers, energy storage devices and earthquake protection devices. [0003] At present, shape memory alloys with practical application value in industry can be divided into three categories according to their composition: Ni-Ti-based allo...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C38/12C22F1/16C21D8/02
Inventor 彭文屹陈朝霞杨能武渠桂丽孙云龙冯亮
Owner NANCHANG UNIV
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