Preparation method of micron-fine-crystal titanium nickel-iron shaped memory alloy block material

A memory alloy and ferroalloy technology, applied in the fields of metal materials and metallurgy, can solve the problems of poor room temperature plasticity of titanium-nickel-iron shape memory alloy, and achieve the effects of improving mechanical properties, simple process method and simple treatment

Inactive Publication Date: 2004-10-20
SHANGHAI JIAO TONG 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 in the prior art, to provide a micron fine-grained titanium-nickel-iron alloy block material equal diameter angle extrusion preparation method, which can solve the problem of poor plasticity of titanium-nickel-iron shape memory alloy at room temperature, and improve its Mechanical properties, while reducing the cost of high-temperature shape memory alloy processing, and improving 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 50% titanium, 47% nickel, and 3% iron. Under the protection of argon, they are melted by vacuum magnetic levitation induction method in a cold-walled iron crucible to make titanium-nickel-iron alloy ingots. Each ingot The mass is about 90 grams. The ingot was annealed at 850°C and held for 4 hours. Wire-cut the titanium-nickel-iron alloy block material into a billet with a cross-section of 9.3×9.3mm and a length of 87mm. The surface treatment of the billet is carried out by the wire electric discharge method, and the surface precision of the grade 4 or above is achieved. The surface roughness of the billet is not high. 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 coat...

Embodiment 2

[0017] Raw materials are prepared according to the atomic percentage of 50% titanium, 45% nickel, and 5% iron, and are melted under vacuum conditions to make titanium-nickel-iron alloy ingots. The ingot was annealed at 800°C and kept for 5 hours. Wire-cut the titanium-nickel-iron alloy block material into a billet with a cross-section of 9.3×9.3mm and a length of 87mm. The surface treatment of the billet is carried out by the wire electric discharge method, and the surface precision of the grade 4 or above is achieved. The surface roughness of the billet is not high. 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 minut...

Embodiment 3

[0020] Raw materials are prepared according to the atomic percentage of 50% titanium, 49% nickel, and 1% iron, and are melted under vacuum conditions to make titanium-nickel-iron alloy ingots. The ingot was annealed at 900°C and kept for 4.5 hours. Wire-cut the titanium-nickel-iron alloy block material into a billet with a cross-section of 9.3×9.3mm and a length of 87mm. The surface treatment of the billet is carried out by the wire electric discharge method to achieve a surface accuracy of 4 or above. The surface roughness of the billet should be no less 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 90°C for 30 minutes. If there are defects such as falling coating, scr...

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Abstract

A microbe-crystal TiFeNi marmen block is prepared from Ti, Ni and Fe through proportional mixing, vacuum smelting to obtain alloy ingot, cutting, polishing, coating glass lubricant, coating graphite lubricant on the surface of cavity in die, preheating and isometric corner pressing by said preheated die. Its advantages are high strength and plasticity, and low cost.

Description

Technical field: [0001] The invention relates to a method for preparing a micron fine-grained titanium-nickel-iron (TiNi-Fe) shape memory alloy block material, which is used to obtain a titanium nickel-iron alloy block material that improves the low-temperature plasticity, strength and shape memory performance of the shape memory alloy, and further Improve 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. TiNi-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 Applications(China)
IPC IPC(8): C22C14/00C22F1/18
Inventor 程先华谢超英向国权
Owner SHANGHAI JIAO TONG UNIV
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