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Ni-Fe-Ga-Co high-temperature magnetic-drive memory alloy

A technology of 1. ni-fe-ga-co and memory alloy, which is applied in the field of memory alloy and can solve the problems that magnetic drive shape memory materials cannot satisfy

Inactive Publication Date: 2010-05-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a Ni-Fe-Ga-Co high temperature magnetic drive memory alloy in order to solve the problem that the existing magnetic drive shape memory materials cannot satisfy Tc>Ms>100°C

Method used

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specific Embodiment approach 1

[0008] Embodiment 1: In this embodiment, the molecular formula of Ni-Fe-Ga-Co high-temperature magnetic drive memory alloy is Ni 56 Fe 17 Ga 27-x co x , the value of x in the molecular formula is 2-6.

[0009] In this embodiment, the preparation method of Ni-Fe-Ga-Co high-temperature magnetically driven memory alloy is as follows: 1. Electrolytic nickel, iron, gallium and electrolytic cobalt are respectively placed in a vacuum degree of 5×10 -3 Smelting under the condition of Pa for 2 minutes to obtain nickel elemental ingots, iron elemental ingots, gallium elemental ingots and cobalt elemental ingots, respectively pulverize each elemental ingots, and ultrasonically clean them in acetone for 20 to 30 minutes to obtain broken nickel material, iron scrap, gallium scrap and cobalt scrap; two, nickel scrap, iron scrap, gallium scrap and cobalt scrap are mixed according to the molar ratio of 56:17:(27-x):x to obtain the mixed material, put the mixture in a vacuum of 4×10 -2 Un...

specific Embodiment approach 2

[0018] Embodiment 2: This embodiment differs from Embodiment 1 in that the value of x in the molecular formula is 2.1-5.9. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the value of x in the molecular formula is 2.3-5.8. Others are the same as in the first embodiment.

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Abstract

The invention relates to a Ni-Fe-Ga-Co high-temperature magnetic-drive memory alloy which belongs to a memory alloy. The invention solves the problem that the traditional magnetic-drive shape memory material can not meet the relational expression that Ms is less than Tc and is more than 100 DEG C. The molecular formula of the Ni-Fe-Ga-Co high-temperature magnetic-drive memory alloy is Ni56Fe17Ga27-xCox, wherein x is 2-6. A Co element is added in the Ni-Fe-Ga-Co high-temperature magnetic-drive memory alloy to obtain a Ni-Fe-Ga-Co alloy meeting the relational expression that Ms is less than Tc and is more than 100 DEG C. The Ni-Fe-Ga-Co high-temperature magnetic-drive memory alloy can be used at high temperature, especially, Ms and Tc of a Ni56Fe17Ga21Co6 alloy are respectively 177 DEG C and 201 DEG C, thereby guaranteeing the application of the high-temperature magnetic-drive memory alloy under high temperature environment.

Description

technical field [0001] The invention relates to a memory alloy. Background technique [0002] The magnetically actuated shape memory materials discovered so far mainly include: NiMnGa, NiFeGa, FePd, FePt, Ni2MnAl, CoNiX (X=Ga, Al) and NiMnX (X=In, Sn, Sb) alloys, etc. But none of them can be used as magnetically actuated shape memory alloys in the high temperature field (above 100°C). Because the main mechanism of magnetically driven shape memory alloys to generate large magnetically induced strains under the action of a magnetic field is the reorientation of the martensitic twin variants under the action of a magnetic field. Therefore, in order to apply the magnetic memory alloy in the high-temperature field, it must be satisfied that the material is in a martensite state at high temperature (martensitic transformation start temperature Ms>100°C), and at the same time, the martensite is required to have ferromagnetism (Curie temperature Tc should be much higher than th...

Claims

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Application Information

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IPC IPC(8): C22C19/03
Inventor 高智勇余慧茹隋解和蔡伟吴冶
Owner HARBIN INST OF TECH
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