Memory alloy driven by magnetic field to deform and preparation method thereof

Abstract

The invention provides a memory alloy driven by a magnetic field to deform and a preparation method thereof and belongs to the field of shape memory alloys. The alloy has the capacity of being controlled by the external magnetic field to deform at room temperature, and is a magnetic control shape memory alloy capable of generating restorable deformation in the manner that martensite twin boundaries are driven by the change of the external magnetic field to migrate and reversely migrate at room temperature. The chemical formula of the alloy is NixMnyGazFej, wherein x is larger than or equal to36 and smaller than or equal to 52, y is larger than or equal to 11 and smaller than or equal to 22, z is larger than or equal to 7 and smaller than or equal to 12, j is larger than or equal to 33 andsmaller than or equal to 48, x+y+z+j is equal to 100, and x, y, z and j show mole percent contents. Compared with existing materials, a Fe-Ga intermetallic compound exists in the microstructure of the magnetic control shape memory alloy, and the alloy has the wide magnetoelastic strain temperature range, the high magnetoelastic strain amount and the good mechanical performance, and can be importantly applied to the fields such as high-precision drivers and actuators used at room temperature.

Description

technical field

[0001] The invention belongs to the field of shape memory alloys, in particular to a magnetic field driven deformation memory alloy and a preparation method thereof. Background technique

[0002] Shape memory alloy is a new type of smart material with both "sensing" and "driving" characteristics. The principle of its "memory" is: the alloy deformed by external force restores its original shape through external factors (temperature or magnetic field, etc.), resulting in a shape memory effect. Because shape memory alloys have the advantages of generating large stress and strain, they are widely used in aerospace, medical, machinery, power and other fields. However, traditional shape memory alloys are driven by temperature, the shape recovery response is slow, and the response frequency is low. At the same time, cooling is often slower than heating and is accompanied by a large amount of heat loss.

[0003] Magnetically controlled shape memory alloy is a new t...

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