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Preparation method of high-strength and high-plasticity Ni-Mn-Ga-Nb memory alloy

A memory alloy and high plasticity technology, which is applied in the field of high strength and high plasticity Ni-Mn-Ga-Nb memory alloy preparation, can solve the problems of small restoring force, low strength, and high brittleness of NiMnGa alloy, and achieve high toughness and fracture The effect of high strength and increased fracture strain

Active Publication Date: 2017-10-27
DALIAN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of existing NiMnGa alloys such as high brittleness, low strength and low recovery force, we adopt aging methods to increase the strength and plasticity of the alloy

Method used

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  • Preparation method of high-strength and high-plasticity Ni-Mn-Ga-Nb memory alloy
  • Preparation method of high-strength and high-plasticity Ni-Mn-Ga-Nb memory alloy
  • Preparation method of high-strength and high-plasticity Ni-Mn-Ga-Nb memory alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The high-strength, high-plasticity Ni of this embodiment 53 mn 25 Ga 21 Nb 1 The preparation method of the memory alloy is prepared as follows: according to the atomic percentage, 53 parts of Ni, 25 parts of Mn, 21 parts of Ga and 1 part of Nb are put into a vacuum intermediate frequency induction melting furnace, and the raw materials are placed in the following order: first place rare elements Nb, Ni is placed next, Ga is placed last, Mn is placed in the smelting furnace for standby, and the side furnace door is closed. Before smelting, vacuumize to 6.67×10 with mechanical pump and Roots pump -3 Pa, then filled with high-purity argon to 0.5Pa. Start smelting and control the smelting power between 350-500Kw. After the molten metal liquid is fully mixed, add Mn at last, pour the alloy liquid into the rod-shaped mold for 3-5 minutes, and obtain a rod-shaped sample of Φ12mm×60mm, and take it out after cooling. The test materials were wire-cut and mechanically polish...

Embodiment 2

[0027] The high-strength, high-plasticity Ni of this embodiment 53 mn 25 Ga 21 Nb 1The difference between the memory alloy and Example 1 is that the aging temperature and aging time are changed, and the aging time is fixed at 3 hours. The specific steps are as follows: heat the samples to 500°C, 600°C, 700°C and 800°C for 3 hours and then quench them into water to obtain high-strength, high-plasticity Ni 53 mn 25 Ga 21 Nb 1 Shape Memory Alloys.

Embodiment 3

[0029] This embodiment high strength, high plasticity Ni 53 mn 25 Ga 21 Nb 1 The difference between the memory alloy and Example 1 is that the aging time is changed to 0.5h, 1h, 3h and 5h under the condition that the aging temperature is kept constant at 700°C.

[0030] The novel high strength, high plasticity Ni prepared by present embodiment 2 and embodiment 3 53 mn 25 Ga 21 Nb 1 Alloy structure analysis, through figure 1 It can be seen that the precipitated phases in all alloys increase first and then decrease with the increase of aging temperature, and the number of precipitated phases is the largest after aging treatment at 700℃ / 3h. From figure 2 It can be seen that the number of precipitates in the alloy increases first and then decreases with the increase of aging time.

[0031] The high-strength, high-plasticity alloy prepared in present embodiment 2 is carried out the test of breaking strength and breaking strain, and test result is as follows image 3 As s...

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Abstract

The invention relates to a preparation method of high-strength and high-plasticity Ni-Mn-Ga-Nb memory alloy. The method comprises the steps of taking raw materials according to an atomic percent, vacuumizing, smelting, adding Mn element and continuously smelting, cleaning, carrying out heat preservation, quenching in water and carrying out homogenization treatment; after that, changing aging temperature and aging time to obtain aged Ni53Mn25Ga21Nb1 alloy. The prepared Ni53Mn25Ga21Nb1 alloy has the advantages of being good in toughness, high in strength, and the like. The method provided by the invention is simple to operate and stable in performance of the prepared alloy, and expands a new idea for the field of high-strength and high-plasticity shape memory alloy.

Description

technical field [0001] The invention relates to a method for preparing a Ni-Mn-Ga-Nb memory alloy with high strength and high plasticity. Background technique [0002] Ni-Mn-Ga shape memory alloy is a new type of intelligent ferromagnetic shape memory material, which has both thermoelastic martensitic phase transformation and ferromagnetic transformation. It not only has the shape memory effect of traditional shape memory alloys controlled by temperature field, but also The shape memory effect can be produced under the action of a magnetic field. The response frequency of its magnetically controlled shape memory effect is close to that of piezoelectric ceramics, and the output strain is close to that of traditional temperature-controlled shape memory alloys. It is a smart material with great engineering application prospects. Because of its unique characteristics, it can also be widely used in drivers and sensors. [0003] However, Ni-Mn-Ga bulk materials still have disadv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10
CPCC22C1/023C22C19/007C22C19/03C22F1/006C22F1/10
Inventor 董桂馥马春荣邱春龙苏康
Owner DALIAN UNIV
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