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A kind of fe-mn-al-ni-cu superelastic alloy and preparation method thereof

A technology for superelastic alloys and sample alloys is applied in the field of iron-based superelastic alloy materials, which can solve the problems that the preparation efficiency and material properties cannot be improved synchronously, and the difficulty of alloy production and application, so as to avoid the phenomenon of natural aging and have a wide range of applications. , The process is simple and effective

Active Publication Date: 2022-07-15
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, in current FeMnAlNi-based alloys, increasing the single crystal preparation efficiency will be accompanied by an increase in the intergranular fracture tendency of the alloy, and the preparation efficiency and material properties cannot be improved simultaneously, which leads to the existence of such alloys in the actual production and application of engineering. difficulty

Method used

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  • A kind of fe-mn-al-ni-cu superelastic alloy and preparation method thereof
  • A kind of fe-mn-al-ni-cu superelastic alloy and preparation method thereof
  • A kind of fe-mn-al-ni-cu superelastic alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] Select industrially used pure metal raw materials metal iron, metal manganese, metal aluminum, metal nickel and metal copper, according to the atomic percentage content of Fe 40.5%, Mn 34%, Al 15%, Ni 7.5%, Cu 3% for batching, using The vacuum non-consumable electric arc furnace is smelted under the protection of argon gas. During the smelting process, the magnetic stirring technology is used to mix the metal solution evenly. The castings were heated to 1200°C for 2 hours and then hot rolled, and hot rolled from 20mm to 6mm at room temperature. Then do as image 3 As shown in the schematic diagram of the cyclic heat treatment, the samples after the cyclic heat treatment were aged at 200°C for 3 hours and then water-cooled.

[0019] The stress-strain curve obtained by loading-unloading the polycrystalline Fe-Mn-Al-Ni-Cu superelastic alloy prepared in this example at room temperature is shown in the attached figure 1 . from the attached figure 1 It can be seen from th...

Embodiment 2

[0021] Select the pure metal raw materials used in industry: metal iron, metal manganese, metal aluminum, metal nickel, metal copper, according to the atomic percentage content of Fe 30-50%, Mn25-40%, Al 10-20%, Ni 1-15%, Cu 1-10% is batched, and the vacuum non-consumable arc furnace is used to smelt under the protection of argon gas. During the smelting process, the magnetic stirring technology is used to make the metal solution evenly mixed. During the smelting process, the alloy is repeatedly smelted for 5 times, and finally suction Cast into columns. The castings were heated to 1200°C for 2 hours after homogenization, and hot rolled from 20mm to 6mm at room temperature. The superelastic alloy was subjected to directional annealing at a temperature above the precipitation temperature of γ-phase. a. The temperature of the hot zone of directional annealing is between 600-1300°C, and the width of the hot zone is between 1-100mm. b. The movement rate of the directional anneali...

Embodiment 3

[0023]Select the pure metal raw materials used in industry: metal iron, metal manganese, metal aluminum, metal nickel, metal copper, according to the atomic percentage content of Fe 30-50%, Mn25-40%, Al 10-20%, Ni 1-15%, Cu 1-10% is batched, and the vacuum non-consumable arc furnace is used to smelt under the protection of argon gas. During the smelting process, the magnetic stirring technology is used to make the metal solution evenly mixed. During the smelting process, the alloy is repeatedly smelted for 5 times, and finally suction Cast into columns. The casting is heated to 1200°C for 2 hours, homogenized for 2 hours, and then hot rolled from 20mm to 6mm at room temperature. The superelastic alloy is heat treated at a temperature above the precipitation temperature of the γ phase, combined with directional annealing and cyclic heat treatment to obtain single crystals. Or columnar crystal Fe-Mn-Al-Ni-Cu superelastic alloy.

[0024] Orientation annealing: a. The temperature...

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Abstract

The invention provides a Fe-Mn-Al-Ni-Cu superelastic alloy and a preparation method thereof, comprising 25-40% of Mn, 10-20% of Al, 1-15% of Ni, 1- 10% of Cu, the rest is Fe; prepared by the following steps: (1) batching according to atomic percentage content, fully smelting and mixing in vacuum or inert gas protection to obtain castings; (2) castings obtained in step (1) Homogenizing treatment, and then deforming to obtain the desired sample alloy; (3) Selecting the directional annealing process and / or the cyclic heat treatment process as required to control the grain size. The invention can effectively improve the single crystal preparation efficiency of cyclic heat treatment and directional annealing, improve the grain growth rate of the alloy, and avoid the tendency of intergranular fracture caused by conventional abnormal grain growth promoting elements Ti and Al in FeMnAlNi alloy.

Description

technical field [0001] The invention relates to a Fe-Mn-Al-Ni-Cu superelastic alloy with superelasticity and a preparation method thereof, and belongs to the technical field of iron-based superelastic alloy materials. Background technique [0002] Superelastic alloys can produce strains far beyond the elastic limit after being deformed by force, and can return to the shape before deformation after stress unloading. This special mechanical behavior with shape memory effect makes it suitable for automotive machinery, aerospace It has a wide range of applications in many fields such as aerospace, vibration reduction and shock resistance, and intelligent sensors. [0003] With the ever-increasing demands of production and life and the material bottlenecks faced by high-tech fields, people urgently need to reduce the cost of superelastic alloys and break through the performance of superelastic alloys. Therefore, in the past few decades, researchers have paid great attention to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/08C22C38/16C22C30/02C22C33/04C21D1/18C21D1/26C21D1/78
CPCC22C38/04C22C38/06C22C38/08C22C38/16C22C30/02C22C33/04C21D1/18C21D1/26C21D1/785
Inventor 张中武汪必琛黎席廷王茜宇
Owner HARBIN ENG UNIV
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