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Method for preparing strongly-textured polycrystalline magnetic control shape memory materials through magnetic field assisted directional solidification

A directional solidification, magnetic field-assisted technology, applied in the preparation of shape memory materials, directional solidification process, and directional solidification to prepare textured polycrystalline magnetron shape memory materials, can solve the loss and weakening of the advantages of intrinsic magnetocrystalline anisotropy Magneto-induced shape memory effect and other problems, to achieve the effect of improving the performance of polycrystalline alloys, improving the magnetic control performance, and promoting high performance

Inactive Publication Date: 2018-01-05
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with single crystals, the macroscopically random distribution of crystal orientations in polycrystals will lead to the loss of the intrinsic magnetocrystalline anisotropy advantage of the crystals, thereby significantly weakening its magnetically induced shape memory effect, such as the current Ni-Mn-Ga The magnetically induced strain obtained in the polycrystalline system is only 0.01-1%

Method used

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  • Method for preparing strongly-textured polycrystalline magnetic control shape memory materials through magnetic field assisted directional solidification
  • Method for preparing strongly-textured polycrystalline magnetic control shape memory materials through magnetic field assisted directional solidification
  • Method for preparing strongly-textured polycrystalline magnetic control shape memory materials through magnetic field assisted directional solidification

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Effect test

Embodiment 1

[0030] In this example, see figure 1 and figure 2 , Using a directional solidification device under a transverse magnetic field to implement a magnetic field-assisted directional solidification to prepare a strongly textured polycrystalline magnetically controlled shape memory material Al 3Ni crystals. The directional solidification device under the transverse magnetic field is mainly composed of a traditional Bridgman directional solidification device and a strong magnet 4. The directional solidification device mainly includes a water-cooled casing 1, a heating furnace 2, a quenching pool 6, a pull rod 7, a corundum crucible 8, a thermocouple 9, and a temperature control The device 11 and the pulling speed control device 10, the corundum crucible 8 and the thermocouple 9 placed with the alloy rod sample are arranged in the heating furnace 2, a water cooling sleeve 1 is installed on the outside of the heating furnace 2, and the strong magnet 4 adopts an electromagnet and Se...

Embodiment 2

[0045] This embodiment is basically the same as Embodiment 1, especially in that:

[0046] In this embodiment, the method for preparing a strongly textured polycrystalline magnetically controlled shape memory material through magnetic field-assisted directional solidification includes the following steps:

[0047] a. Raw material preparation of polycrystalline alloy:

[0048] The material is Ni-Mn-Ga alloy, Ni, Mn and Ga metals with a purity of 99.99% are selected, and the required metal raw materials are weighed according to the alloy composition ratio, and the weighed metal raw materials are placed in a vacuum electric arc furnace for melting. Then the alloy ingot is smelted repeatedly for more than 4 times to ensure that the alloy composition is uniform. In the last melting and casting process, the alloy ingot is first melted again, and then sucked into the copper mold under the crucible in the vacuum electric arc furnace to obtain Uniform Ni-Mn-Ga raw alloy rods with a si...

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Abstract

The invention discloses a method for preparing strongly-textured polycrystalline magnetic control shape memory materials through magnetic field assisted directional solidification, and belongs to thetechnical field of crystal growth orientation control and magnetic control shape memory material researching. A used device is a traditional general device and comprises an electromagnetic device anda directional solidification device. A magnetic field is introduced into the directional solidification process, and through the dual effects of crystal orientation in the alloy solidification processthrough directional solidification and a magnetic field, the magnetic control shape memory materials are induced to be completely orientated. In the directional solidification process of the magneticfield, the crystals with growth anisotropy and magnetocrystalline anisotropy grow in the preferentially growing direction, meanwhile, under the effect of the magnetic field, the magnetic field drivesthe crystals to rotate, the crystals are orientated in a certain direction, and the completely-oriented polycrystalline magnetic control shape memory materials are obtained. The new method is provided for preparing of the strongly-textured polycrystalline magnetic control shape memory materials.

Description

technical field [0001] The present invention relates to a preparation method of shape memory materials, in particular to a method for preparing textured polycrystalline magnetically controlled shape memory materials by directional solidification, and also relates to a directional solidification process under the action of an external field, which is applied to crystal growth orientation Technical field of control and magnetic control shape memory materials. Background technique [0002] In recent years, with the rapid development of aerospace, mechatronics, energy environment, marine development, biomedicine and other fields, especially the increasingly significant high efficiency, low power consumption, miniaturization, miniaturization and Intelligentization urgently requires sensing and driving mechanisms to have higher energy conversion efficiency and dynamic response speed, so research and development of various new materials with superior performance is an important and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/02B22D27/04C30B28/06C30B30/04
Inventor 李喜侯龙戴砚超童辉
Owner SHANGHAI UNIV
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