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Fe-Mn-Al-Ni-Nb shape memory alloy and preparation method thereof

A fe-mn-al-ni-nb, memory alloy technology, applied in the field of Fe-Mn-Al-Ni-Nb shape memory alloy and its preparation, can solve the problems of insufficient research on alloying and the like

Active Publication Date: 2020-02-21
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, for the new alloy system of FeMnAlNi, the research on alloying is not deep enough.

Method used

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  • Fe-Mn-Al-Ni-Nb shape memory alloy and preparation method thereof
  • Fe-Mn-Al-Ni-Nb shape memory alloy and preparation method thereof
  • Fe-Mn-Al-Ni-Nb shape memory alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A superelastic Fe-Mn-Al-Ni-Nb shape memory alloy, the alloy elements and their atomic percentages are:

[0034] Mn: 20.00%; Al: 16.00%; Ni: 14.0%; Nb: 0.50%;

[0035] Its preparation method is as follows:

[0036] (1) According to the stoichiometry of the above elements, industrial pure iron, electrolytic aluminum, electrolytic nickel and ferroniobium are directly smelted in an induction furnace at a temperature of 1500°C and refined for 10 minutes;

[0037] (2) After the alloy in step (1) is completely melted and maintained for 3 minutes, ferromanganese is added, the alloy melt is mixed uniformly and then kept at 1500° C. for 10 minutes, and then cooled to room temperature with the furnace to obtain an ingot;

[0038] (3) heating the ingot in step (2) to 1100° C. for homogenization treatment for 12 hours in a vacuum furnace, and then cooling to room temperature with the furnace to obtain the treated ingot;

[0039] (4) Cut strip samples of appropriate size from the i...

Embodiment 2

[0046] A superelastic Fe-Mn-Al-Ni-Nb shape memory alloy, the alloy elements and their atomic percentages are:

[0047] Mn: 28.50%; Al: 20.00%; Ni: 11.00%; Nb: 1.00%; Fe: balance.

[0048] Its preparation method is as follows:

[0049] (1) According to the stoichiometry of the above elements, industrial pure iron, electrolytic aluminum, electrolytic nickel and ferroniobium were directly smelted in an induction furnace at a temperature of 1550°C for 8 minutes of refining.

[0050] (2) After the alloy in step (1) is completely melted and maintained for 5 minutes, ferromanganese is added, the molten alloy is mixed evenly and kept at 1550° C. for 8 minutes, and then cooled to room temperature with the furnace to obtain an ingot.

[0051] (3) heating the ingot in step (2) to 1100° C. for homogenization treatment for 10 hours in a vacuum furnace, and then cooling to room temperature with the furnace to obtain the treated ingot;

[0052] (4) Cut strip samples of appropriate size fro...

Embodiment 3

[0059] A superelastic Fe-Mn-Al-Ni-Nb shape memory alloy, the alloy elements and their atomic percentages are:

[0060] Mn: 36.50%; Al: 15.50%; Ni: 7.50%; Nb: 1.00%; Fe: balance.

[0061] Its preparation method is as follows:

[0062] (1) According to the stoichiometry of the above elements, industrial pure iron, electrolytic aluminum, electrolytic nickel and ferroniobium are directly smelted in an induction furnace at a temperature of 1550°C for 10 minutes of refining;

[0063] (2) After the alloy in step (1) is completely melted and maintained for 5 minutes, ferromanganese is added, the alloy melt is mixed uniformly and then kept at 1550° C. for 10 minutes, and then cooled to room temperature with the furnace to obtain an ingot;

[0064] (3) heating the ingot in step (2) to 1100° C. for homogenization treatment for 10 hours in a vacuum furnace, and then cooling to room temperature with the furnace to obtain the treated ingot;

[0065] (4) Cut strip samples of appropriate si...

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Abstract

The invention relates to an Fe-Mn-Al-Ni-Nb shape memory alloy and a preparation method thereof. The Fe-Mn-Al-Ni-Nb shape memory alloy comprises 20%-43% of Mn, 13.50%-20% of Al, 7%-14% of Ni, 0.50%-2%of Nb, and the balance Fe. The preparation method comprises the steps: directly smelting industrial pure iron, electrolytic aluminum, electrolytic nickel and niobium iron in an induction furnace, andcompletely melting; adding ferromanganese, mixing alloy melt, and cooling to the room temperature along with the furnace to obtain a cast ingot; homogenizing the cast ingot in a vacuum furnace to obtain a treated cast ingot; and preserving heat of the cast ingot at 1250 DEG C for 30-60 min, then cooling to 900 DEG C for heat preservation for 30-60 min, repeatedly preserving heat at 1250 DEG C and900 DEG C for 2-10 cycles of heat treatment, and water quenching to the room temperature. According to the Fe-Mn-Al-Ni-Nb shape memory alloy and the preparation method thereof, the intracrystalline precipitation is promoted by the Nb, and a matrix is strengthened; the grain growth driving force is improved, and the as-cast sample has recoverable strain of more than 1.8% after heat treatment.

Description

technical field [0001] The invention relates to the field of functional materials, and provides a Fe-Mn-Al-Ni-Nb shape memory alloy and a preparation method thereof. Background technique [0002] Shape memory alloys (SMAs) are a class of functional alloys with shape memory effect and pseudo / superelasticity. The phenomenon of the original state; and superelasticity refers to the deformation (stretching, compression, bending, etc.) of the alloy sample in the full austenitic state (T>Af) that is greater than its elastic stage under the action of an external force. When the external force is removed, the alloy The phenomenon that the sample returns to the state before the external force. [0003] At present, the main applications of SMAs include Ni-Ti-based, Cu-based, Fe-based and other shape memory alloy systems. Ni-Ti-based alloys have excellent shape memory properties and biocompatibility, and are widely used in aerospace, electronic devices, medical devices and other fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C33/04C22C38/04C22C38/06C22C38/08C22C38/12C21D1/78C22C1/02
CPCC21D1/785C21D2201/01C22C1/02C22C30/00C22C33/04C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 董治中孙德山宁保群王志奇
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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