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Method for preparing micron fine-crystal titanium-nickle-hafnium high-temp. shape memory alloy cube matherial

A memory alloy and titanium-nickel technology, which is applied to the preparation of micron fine-grained titanium-nickel-hafnium high-temperature shape memory alloys and the field of titanium-nickel-hafnium alloy bulk materials, can solve problems such as poor room temperature plasticity, improve mechanical properties, improve flow uniformity, The effect of high yield

Inactive Publication Date: 2006-05-24
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 solve the problem of poor plasticity of titanium-nickel-hafnium shape-memory alloy at room temperature, improve its mechanical properties, and reduce the high-temperature shape at the same time. Reduce the cost of memory alloy processing and increase its yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The raw materials are equipped with 51% titanium, 1% hafnium and 48% nickel by atomic percentage, and are melted by vacuum magnetic levitation induction method in a cold-walled copper crucible under the protection of argon to make a titanium-nickel-hafnium alloy ingot. The ingot was annealed at 850°C and kept for 2 hours. The titanium-nickel-hafnium alloy bulk material is wire-cut into blanks with a cross-section of 9.4×9.4mm and a length of 100mm. Surface treatment is carried out on the blanks to achieve surface processing accuracy above level 4, and the surface roughness of the blanks is Ra=1.25-2.5μm. 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, 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 30 minutes. I...

Embodiment 2

[0017] Raw materials are prepared according to the atomic percentage of 40% titanium, 11% hafnium, and 49% nickel, and are melted under vacuum conditions to make titanium-nickel-hafnium alloy ingots. The ingot was annealed at 900°C and kept for 1 hour. The titanium-nickel-hafnium alloy bulk material is wire-cut into blanks with a cross-section of 9.4×9.4mm and a length of 100mm. Surface treatment is carried out on the blanks to achieve surface processing accuracy above level 4, and the surface roughness of the blanks is Ra=1.25-2.5μm. Clean the surface of the blank with acetone, place the blank on a stainless steel tray, preheat it at 90°C for 30 minutes, and then apply glass protective lubricant on the surface of the blank by dip coating. The thickness of the layer is about 0.2mm. After coating, the blank is dried at 90°C for 20 minutes. If there are defects such as falling coating, scratches, and peeling, it should be re-coated or washed off and re-coated. Use acetone to cl...

Embodiment 3

[0020]Raw materials are prepared according to the atomic percentage of 27% titanium, 25% hafnium, and 48% nickel, and are melted under vacuum conditions to make titanium-nickel-hafnium alloy ingots. The ingot was annealed at 1000°C and kept for 1 hour. The titanium-nickel-hafnium alloy bulk material is wire-cut into blanks with a cross-section of 9.4×9.4mm and a length of 100mm. Surface treatment is carried out on the blanks to achieve surface processing accuracy above level 4, and the surface roughness of the blanks is Ra=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 glass protective lubricant on the surface of the blank by dip coating, the coating should be uniform , The thickness of the coating is about 0.2mm. 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 peeling, it should be...

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Abstract

The invention relates to a method to produce micrometer crystal titanium-nickel- hafnium shape memory alloy. The raw material includes 99.95% purity titanium sponge, 99.90% purity hafnium filament, and 99.95% purity nickel. Smelting in vacuum, the titanium-nickel- hafnium alloy ingot would be gained, and cutting the ingot into blank to take surface process and covered with graphite lubricant, heating the blank under the condition of 300-400 degree centigrade in heating furnace, taking equal diameter bend angle extruding process after taking out to gain the titanium-nickel- hafnium alloy block material. The invention improves the mechanical property of the alloy and decreases the cost of treatment.

Description

technical field [0001] The invention relates to a method for preparing a micron fine-grained titanium-nickel-hafnium (TiNi-Hf) high-temperature shape memory alloy, which adopts an equal-diameter angle extrusion method to prepare titanium-nickel for improving the low-temperature plasticity, strength and high-temperature shape memory performance of the high-temperature shape-memory alloy Hafnium alloy block material, thereby improving the practical engineering application value of the shape memory alloy in the fields of aerospace, nuclear industry and automobile industry. The invention belongs to the technical field of metal materials and metallurgy. Background technique [0002] Since its appearance in the 1970s, shape memory alloys have been widely valued by the material industry, and have shown great application prospects in aerospace, civil industry, nuclear industry, biomedicine and other fields. At present, the shape memory alloys that have been widely used are mainly T...

Claims

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Application Information

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IPC IPC(8): C22F1/16
Inventor 程先华李振华
Owner SHANGHAI JIAO TONG UNIV
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