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Microcrystal nickel aluminum-iron shape memory alloy block material preparation method

A memory alloy, crystalline nickel-aluminum technology, which is applied in the field of microcrystalline nickel-aluminum-iron shape memory alloy bulk preparation, can solve problems such as poor room temperature plasticity, and achieve good effects such as improving mechanical properties, reducing costs, and plasticity.

Inactive Publication Date: 2006-05-17
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art, to provide a method for preparing a micron-sized nickel-aluminum-iron shape memory alloy bulk material, to solve the problem of poor plasticity of the nickel-aluminum-iron shape memory alloy at room temperature, to improve its mechanical properties, and at the same time reduce the The cost of high-temperature shape memory alloy processing to improve its yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The raw materials are prepared according to the atomic percentage of 62% nickel, 23% aluminum, and 15% iron. Under the protection of argon, they are melted by vacuum magnetic levitation induction method in a cold-walled iron crucible to make nickel-aluminum-iron alloy ingots. Each ingot The mass is about 90 grams. The ingot was annealed at 1100°C and kept for 72 hours. Wire-cut the nickel-aluminum-iron alloy block material into a billet with a cross-section of 9.3×9.3mm and a length of 87mm, and perform surface grinding on the billet to achieve a surface precision of 4 or above, and the surface roughness of the billet is not lower than R a = 1.25 to 2.5 μm. Clean the surface of the blank with acetone, preheat at 80°C for 30 minutes, and then apply glass protective lubricant on the surface of the blank by dip coating. The coating should be uniform and the thickness of the coating is about 0.2mm. After coating, the blank is dried at 90°C for 20 minutes. If there are def...

Embodiment 2

[0017] Raw materials are prepared according to the atomic percentage of 57% nickel, 25% aluminum, and 18% iron, and are melted under vacuum conditions to make nickel-aluminum-iron alloy ingots. The ingot was annealed at 1150°C and kept for 48 hours. Wire-cut the nickel-aluminum-iron alloy block material into a billet with a cross-section of 9.3×9.3mm and a length of 87mm, and perform surface grinding on the billet to achieve a surface precision of 4 or above, and the surface roughness of the billet is not lower than R a = 1.25 to 2.5 μm. Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at a temperature of 65°C for 50 minutes, and then apply a glass protective lubricant on the surface of the blank by dipping, and the coating should be uniform , The thickness of the coating is about 0.3mm. After coating, the blank is dried at a temperature of 90°C for 20 minutes. If there are defects such as falling coating, scratches, and...

Embodiment 3

[0020] Raw materials are prepared according to the atomic percentage of 60% nickel, 24% aluminum and 16% iron, and are smelted under vacuum conditions to make nickel-aluminum-iron alloy ingots. The ingot was annealed at 1150°C and kept for 72 hours. Wire-cut the nickel-aluminum-iron alloy block material into a billet with a cross-section of 9.3×9.3mm and a length of 87mm, and perform surface grinding on the billet to achieve a surface precision of grade 4 or above. The surface roughness of the billet should not be lower than R a = 1.25 to 2.5 μm. Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at 100°C for 20 minutes, and then apply glass protective lubricant on the surface of the blank by dip coating, the coating should be uniform , The thickness of the coating is about 0.4mm. After coating, the blank is dried at a temperature of 90°C for 30 minutes. If there are defects such as falling coating, scratches, and peeling,...

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Abstract

A method for preparing a microcrystalline nickel-aluminum-iron shape memory alloy bulk material, the raw materials are prepared according to the atomic percentage of 57% to 62% nickel, 23% to 25% aluminum, and 15% to 18% iron, and the raw materials are prepared under vacuum conditions Melting to make nickel-aluminum-iron alloy ingots, cutting nickel-aluminum-iron alloy blocks into blanks, performing surface finish treatment, and coating glass lubricant, using equal-diameter corner extrusion with an extrusion channel angle of 90-120° Press the mold, the surface of the mold cavity is coated with graphite lubricant, the billet and the mold are heated and kept separately, and at the same time they are taken out of the heating furnace for equal-diameter bending extrusion, and finally a nickel-aluminum-iron alloy block with good strength and plasticity is obtained material. The invention can solve the problem of poor room-temperature plasticity of the nickel-aluminum-iron shape memory alloy, improve the mechanical properties of the alloy, reduce the processing cost of the alloy, and increase the yield of the alloy.

Description

Technical field: [0001] The invention relates to a method for preparing a micron-grained nickel-aluminum-iron (NiAl-Fe) shape memory alloy block material, which is used to obtain a nickel-aluminum-iron alloy block material that improves the low-temperature plasticity, strength and shape memory performance of the shape memory alloy, and further improves the The practical engineering application value of the shape memory alloy in the fields of aerospace, medical and health, civil industry and the like. The invention belongs to the technical field of metal materials and metallurgy. Background technique: [0002] Since the appearance of shape memory alloy in the early 1970s, it has received extensive attention from the material industry, and has shown great application prospects in civil industry, aerospace, nuclear industry, biomedicine and other fields. NiAl-Fe alloy has many excellent properties, such as: good mechanical properties (high specific strength, good thermal stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22F1/10
Inventor 程先华向国权
Owner SHANGHAI JIAOTONG UNIV
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