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Preparation method for shape memory alloy with exchange bias effect

A technology of memory alloy and bias effect, which is applied in the field of preparation of shape memory alloy with exchange bias effect, can solve the problems of low temperature and unfavorable practical application of materials, and achieve the effects of low preparation cost, low cost and convenient operation

Active Publication Date: 2018-07-13
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of exchange bias field is very weak and there are materials with low temperature, which is not conducive to practical application

Method used

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  • Preparation method for shape memory alloy with exchange bias effect
  • Preparation method for shape memory alloy with exchange bias effect
  • Preparation method for shape memory alloy with exchange bias effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Mn 2 Preparation process of NiAl ribbon sample

[0024] Step 1: Follow Mn 2 Calculate the mass of each element required by the NiAl chemical formula, and use an electronic balance to weigh the metal element Mn: 5.8356g (0.106mol), Ni: 2.9999g (0.053mol) and Al: 1.3789g (0.053mol) with a purity of 99.99%; Prepare a piece of unoxidized metal zirconium ingot;

[0025] The second step: Put the unoxidized metal zirconium ingot and the weighed metal element into the electric arc furnace. Use mechanical pump and molecular pump to pump the vacuum in the electric arc furnace to 2x10 -3 Pa. Then fill with argon to atmospheric pressure;

[0026] Step 3: Use an electric arc with a current of 50A to melt the metal zirconium ingot to ensure that the alloy will not be oxidized during the melting process. After the arc is stable, use an electric arc with a current of 85A to melt the prepared metal element. Prepare a uniform ingot-like sample after repeated smelting for...

Embodiment 2

[0030] Example 2: Mn 1.9 co 0.1 Preparation process of NiAl ribbon sample

[0031] Step 1: Follow Mn 1.9 co 0.1 Calculate the mass of each element required by the NiAl chemical formula, and use an electronic balance to weigh Mn: 3.9016g (0.071mol), Ni: 2.0952g (0.037mol), Al: 0.9628g (0.037mol) and Co : 0.2104g (0.004mol); Prepare a piece of unoxidized metal zirconium ingot;

[0032] The second step: Put the unoxidized metal zirconium ingot and the weighed metal element into the electric arc furnace. Use mechanical pump and molecular pump to pump the vacuum in the electric arc furnace to 2x10 -3 Pa and then filled with argon to atmospheric pressure;

[0033]Step 3: Use an electric arc with a current of 50A to melt the metal zirconium ingot to ensure that the alloy will not be oxidized during the melting process. After the arc is stable, use an electric arc with a current of 85A to melt the prepared metal element. Prepare a uniform ingot-like sample after repeated smelti...

Embodiment 3

[0037] Example 3: Mn 1.8 co 0.2 Preparation process of NiAl ribbon sample

[0038] Step 1: Follow Mn 1.8 co 0.2 Calculate the mass of each metal element required by the NiAl chemical formula, and weigh the metal element Mn with a purity of 99.99%: 3.6994g (0.067mol), Ni: 2.0957g (0.037mol), Al: 0.9627g (0.037mol) and Co : 0.4207g (0.007mol); prepare a piece of unoxidized metal zirconium ingot;

[0039] The second step: Put the unoxidized metal zirconium ingot and the weighed metal element into the electric arc furnace. Use mechanical pump and molecular pump to pump the vacuum in the electric arc furnace to 2x10 -3 Pa and then filled with argon to atmospheric pressure;

[0040] Step 3: Use an electric arc with a current of 50A to melt the metal zirconium ingot to ensure that the alloy will not be oxidized during the melting process. After the arc is stable, use an electric arc with a current of 85A to melt the prepared metal element. Prepare a uniform ingot-like sample a...

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Abstract

The invention discloses a preparation method for the shape memory alloy with the exchange bias effect. The method comprises the following steps of weighing each metal substance according to the atom ratio showed by Mn2-xCoxNiAl, wherein the atom ratio is as the equivalent that Mn:Co:Ni:Al=(2-x):x:1:1, and the x ranges from 0 to 0.3; placing the metal materials into an electric arc furnace, and obtaining alloy ingots after carrying out electric arc melting for three to five days; and carrying out polishing and washing on the alloy ingots, then, placing the treated alloy ingots into a melt-spinning machine furnace, applying electric currents to smelt the alloy ingots, and obtaining the shape memory alloy with the exchange bias effect after the molten sample is ejected out by utilizing the gas pressure difference between a test tube and the interior of a furnace chamber. The preparation method for the shape memory alloy with the exchange bias effect is simple in preparation technology, low in cost and quick to carry out. The prepared belt-shaped sample is high in exchange bias effect, can exist at the high temperature (about 100 K), and meets the requirements for potential applicationin the fields such as magnetic storage, magnetic recording and spin valves.

Description

technical field [0001] The invention belongs to a novel shape memory alloy Mn with exchange bias effect 2-x co x NiAl (0≤x≤0.3) is a new type of material with exchange bias effect, which is a pure phase sample with exchange bias effect prepared by the method of smelting single metal in electric arc furnace and then strip quenching. Background technique [0002] In recent years, shape memory alloys with exchange bias effects have attracted extensive interest due to their potential applications in giant magnetoresistance, ultrahigh-density magnetic recording, and spin valve devices. People have conducted more detailed research on Ni-rich shape memory alloys before, and prepared a series of Ni-rich samples with exchange bias effects, such as in the literature Structure, magneto-structural transitions and magnetocaloric properties in Ni 50-x mn 37+ x In 13 The alloy with exchange bias effect introduced in melt spun ribbons. has an exchange bias field of only 250Oe, and no e...

Claims

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Application Information

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IPC IPC(8): C22C22/00C22C30/00C22C1/02B22D11/06
CPCB22D11/001B22D11/0611C22C1/02C22C22/00C22C30/00
Inventor 刘国栋王峻峰代学芳张小明李英
Owner HEBEI UNIV OF TECH
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