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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, applied in the fields of metal materials and metallurgy, can solve problems such as poor room temperature plasticity of titanium-nickel-based shape memory alloys, and achieve the effects of solving poor room temperature plasticity, simple process method and high success rate

Inactive Publication Date: 2005-09-14
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 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] The 50% atomic percentage of titanium and 50% of nickel are prepared and smelted by cold-walled copper crucible vacuum magnetic levitation induction method under the protection of argon gas to produce titanium-nickel alloy ingots, each with a mass of about 90 grams. The ingot was annealed at 850°C and kept for 4 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 blank is surface treated by wire-cut EDM to achieve a surface accuracy above level 4, and the surface roughness of the blank is not low. To R a =1.25~2.5μm. Use acetone to clean the surface of the blank, place the blank on a clean stainless steel tray, preheat it at 80°C for 30 minutes, and then apply a glass protective lubricant on the surface of the blank by dip coating. The coating should be even The thickness of the coating is about 0.2mm. After coating, the blank is dried at 90°C for 20 minutes. If there are defects such as drop coat...

Embodiment 2

[0017] The 45% atomic percentage of titanium and 55% of nickel 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. 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 blank is surface treated by wire-cut EDM to achieve a surface accuracy above level 4, and the surface roughness of the blank is not low. To R a =1.25~2.5μm. Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at 65°C for 50 minutes, and then apply a glass protective lubricant on the surface of the blank by dip coating. The coating should be even , The coating thickness is about 0.3mm. After coating, the blank is dried at 90°C for 20 minutes. If there are defects such as drop coating, scratches, peeling, etc., it should be repaired or washed off and recoated. Use acetone to clean the surface and cavity of t...

Embodiment 3

[0020] The 52 atomic percent of titanium and 48% of nickel are prepared and smelted under vacuum to produce a titanium-nickel alloy ingot. The ingot was annealed at 900°C for 4.5 hours. The titanium-nickel alloy block material is wire-cut into a blank with a cross-section of 9.3×9.3mm and a length of 87mm. The surface of the blank is treated by wire-cut electric discharge to achieve a surface accuracy of 4 or more. The surface roughness of the blank should not be Lower than R a =1.25~2.5μm. 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 a glass protective lubricant on the surface of the blank by dip coating. The coating should be even , The coating thickness is about 0.4mm. After coating, the blank is dried at 90°C for 30 minutes. If there are defects such as drop coating, scratches, peeling, etc., it should be recoated or washed off and recoated. Use acetone to clean the surface and ...

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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-crystalline titanium nickel (TiNi) alloy block material by equal-diameter bending angle extrusion, which is used to obtain a titanium-nickel alloy block material that improves the low-temperature plasticity, strength and shape memory performance of shape memory alloys, thereby improving The actual engineering application value of the shape memory alloy in aerospace, medical and health, civil industry and other fields. It belongs to the technical field of metal materials and metallurgy. Background technique: [0002] Since its inception in the early 1970s, shape memory alloys have received extensive attention from the material industry and have shown great application prospects in the civil industry, aerospace, nuclear industry, biomedicine and other fields. Nearly equal atomic ratio TiNi (50at.%) alloy has many excellent properties, such as: good mechanical properties (high specific strength, good...

Claims

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Application Information

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