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Micron fine-grained titanium-nickel alloy block material isodiametric corner extrusion preparing method

A titanium-nickel alloy and equal-diameter technology, which is applied in the field of metal materials and metallurgy, can solve the problems of poor plasticity at room temperature of titanium-nickel-based shape memory alloys, and achieve the effects of poor room temperature plasticity, cost reduction, and good plasticity.

Inactive Publication Date: 2004-09-15
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 of the prior art, to provide a method for preparing micron fine-grained titanium-nickel alloy block material with equal diameter angle extrusion, which can solve the problem of poor room temperature plasticity of titanium-nickel-based shape memory alloys and improve their mechanical properties , while reducing the cost of high-temperature shape memory alloy processing and increasing its yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Titanium with an atomic percentage of 50% and nickel with a percentage of 50% are prepared and melted by vacuum magnetic levitation induction method in a cold-walled copper crucible under the protection of argon to make a titanium-nickel alloy ingot, each ingot having a mass of about 90 grams. The ingot was annealed at 850°C and held for 4 hours. The titanium-nickel alloy bulk material is wire-cut 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 cutting method, and the surface precision of the grade 4 or above is achieved. The surface roughness of the billet is not low. in 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 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 , The thickness of the coating i...

Embodiment 2

[0017] Titanium with an atomic percentage of 45% and nickel with a percentage of 55% are prepared and smelted under vacuum conditions to make a titanium-nickel alloy ingot. The ingot was annealed at 800°C and kept for 5 hours. The titanium-nickel alloy bulk material is wire-cut 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 cutting method, and the surface precision of the grade 4 or above is achieved. The surface roughness of the billet is not low. in 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...

Embodiment 3

[0020] Titanium with an atomic percentage of 52% and nickel with a percentage of 48% is prepared and smelted under vacuum conditions to make a titanium-nickel alloy ingot. The ingot was annealed at 900°C and kept for 4.5 hours. Wire-cut the titanium-nickel alloy block material into a blank with a cross-section of 9.3×9.3mm and a length of 87mm. The surface treatment of the blank is carried out by the wire electric discharge method to achieve a surface precision of 4 or above. The surface roughness of the blank should not exceed 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 90°C for 30 minutes. If there are defects such as falling coating, scratches, and peeling, i...

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Abstract

The invention is an isometric angle squeezing producing method for a kind of micron tiny crystal titanium nickel alloy block materials. Titanium and nickel whose atom percentage are 45%-52% and 48%-55% are melted in vacuum, produces the titanium nickel base alloy cast ingot, cuts the block materials into blanks, and carries on surface finish process, and paints with glass lubricate, uses squeezing mould with 90-120 degrees angle, the surface of mould cavity is painted with black lead lubricate, the blank, mould are heated, and they are taken out from the stove and carried on with angle squeezing, finally acquires the titanium nickel base alloy block materials with excellent intensity and plasticity. The invention enhances the mechanical property of alloy, and reduces the cost.

Description

Technical field: [0001] The invention relates to a method for preparing micron fine-grained titanium-nickel (TiNi) alloy blocks with equal diameter angle extrusion, which is used to obtain titanium-nickel alloy blocks with improved low-temperature plasticity, strength and shape memory properties of shape memory alloys, 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. Near equiatomic ratio TiNi (50at.%) alloy has many excellent properties, such as: good mechanical properties (high specific strength, good the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
Inventor 程先华谢超英向国权李振华
Owner SHANGHAI JIAO TONG UNIV
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