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Shape memory alloy and preparation method thereof

A memory alloy and alloy technology, applied in the field of shape memory alloy and its preparation, alloy and its preparation, can solve the problems of low yield and poor corrosion resistance, achieve good corrosion resistance, simple preparation process, and improve shape memory effect Effect

Inactive Publication Date: 2010-05-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alloy has poor corrosion resistance, and like conventional Fe-Mn-Si-based shape memory alloys, it needs to be prepared through melting and casting-alloy ingot homogenization annealing-forging or rolling-high temperature setting treatment, etc., and the yield is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This embodiment provides a shape memory alloy, the composition and weight percentage of the alloy are: Mn 14%, Si 7%, Cr 10%, Ni 5%, C 0.1%, and the balance is Fe.

[0018] The preparation method of the alloy is as follows:

[0019] Step 1, according to the weight percentage of each component, get following raw material respectively: grade is the low-carbon steel of 20, Fe, Mn, Si, Cr and Ni; Wherein, the weight ratio of low-carbon steel and Fe is 25:7;

[0020] Step 2, vacuum induction melting each raw material except Mn;

[0021] Step 3: adding Mn, melting in an argon atmosphere, and cooling naturally to obtain a shape memory alloy.

[0022] Implementation effect of this embodiment:

[0023] Get the shape memory alloy prepared in this embodiment and carry out the following experiments:

[0024] 1. Experiment of bending sample: Prepare the sample for bending experiment, use the bending mold to pre-deform the sample by 6%, and after the shape recovery treatment at 77...

Embodiment 2

[0028] This embodiment provides a shape memory alloy, the composition and weight percentage of the alloy are: Mn 15%, Si 6%, Cr 9%, Ni 6%, C 0.05%, and the balance is Fe.

[0029] The preparation method of the alloy is as follows:

[0030] Step 1, according to the weight percentage of each component, take the following raw materials respectively: grade is 20 low carbon steel, Fe, Mn, Si, Cr and Ni; Wherein, the ratio of low carbon steel to Fe is 25: 39;

[0031] Step 2, vacuum induction melting each raw material except Mn;

[0032] Step 3, adding Mn, smelting under nitrogen atmosphere, casting in a metal mold and cooling naturally;

[0033] Step 4, performing solution quenching on the alloy obtained by smelting in step 3. The solution quenching specifically includes: heating the alloy to 1125K for 30 minutes, and then water cooling to obtain a shape memory alloy.

[0034] The implementation effect of this embodiment: prepare the bending test sample, utilize the bending mold ...

Embodiment 3

[0036] This embodiment provides a shape memory alloy, the composition and weight percentage of the alloy are: Mn 14.5%, Si 6.8%, Cr 9.2%, Ni 5.3%, C 0.08%, and the balance is Fe.

[0037] The preparation method of the alloy is as follows:

[0038] Step 1, according to the weight percentage of each component, take the following raw materials respectively: grade is 20 low carbon steel, Fe, Mn, Si, Cr and Ni; Wherein, the ratio of low carbon steel to Fe is 5: 3;

[0039] Step 2, vacuum induction melting each raw material except Mn;

[0040] Step 3, adding Mn, melting in an argon atmosphere, casting in a metal mold and cooling naturally;

[0041] Step 4, performing solution quenching on the alloy obtained by smelting in step 3. The solution quenching specifically includes: heating the alloy to 1150K for 20 minutes, and then water cooling to obtain a shape memory alloy.

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Abstract

The invention provides a shape memory alloy and a preparation method thereof, belonging to the technical field of materials. The shape memory alloy comprises the following components in percent by weight: 14-15% of Mn, 6-7% of Si, 9-10% of Cr, 5-6% of Ni, 0.05-0.1% of C, and the balance of Fe. The preparation method of the shape memory alloy comprises the following steps: firstly, according to the weight percentages of all components of the shape memory alloy, respectively taking the following raw materials, such as ultra low carbon steel, Mn, Si, Cr and Ni, or respectively taking low carbon steel, Fe, Mn, Si, Cr and Ni; secondly, melting all raw materials except Mn by vacuum induction; and thirdly, adding Mn in the mixture and conducting melting in the inert gas and obtaining the shape memory alloy by natural cooling. The strength and recoverable strain of the shape memory alloy is obviously higher than those of the normal Fe-Mn-Si alloy, the corrosion resistance of the shape memory alloy is good, the recoverable strain of the shape memory alloy is 3% under a casting condition and is further increased after solution-quenching treatment; furthermore, the preparation process of the shape memory alloy is simple.

Description

technical field [0001] The invention relates to an alloy in the technical field of metal materials and a preparation method thereof, in particular to a shape memory alloy and a preparation method thereof. Background technique [0002] Compared with copper-based and Ni-Ti-based shape memory alloys, Fe-Mn-Si-based shape memory alloy (SMA) has high strength, good plasticity, easy smelting and processing, and low cost, so it has become a promising functional material. . However, their poor shape memory effect (SME) and low recoverable strain hinder their practical application. People have successively developed methods such as thermomechanical cycle training and thermal pre-deformation of austenite, which can significantly increase the recoverable strain of the alloy, but the process is complicated and has no practical value, especially not suitable for pipe joints. [0003] After searching the literature of the prior art, it was found that the Chinese Invention Patent Authori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C33/04C21D1/18C21D10/00
Inventor 黄斌李建国木户照雄
Owner SHANGHAI JIAO TONG UNIV
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