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Micro fine-grained titanium-nickel-niobium shape memory alloy block material preparing method

A technology of memory alloy and niobium alloy, which is applied in the field of metal materials and metallurgy, can solve problems such as poor plasticity at room temperature, achieve the effects of improving mechanical properties, preventing grain growth, and high growth rate

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 in the prior art, to provide a method for preparing a micron fine-grained titanium-nickel-niobium shape memory alloy bulk material, which can solve the problem of poor room temperature plasticity of titanium-nickel-niobium-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 raw materials are 50% titanium, 40% nickel and 10% niobium by atomic percentage, and are smelted by cold-wall niobium crucible vacuum magnetic levitation induction method under the protection of argon to make titanium-nickel-niobium alloy ingots. The mass of the ingot is about 90 grams. The ingot was annealed at 850°C for 4 hours. The titanium-nickel-niobium alloy bulk material is wire-cut into a billet with a cross-section of 9.3×9.3mm and a length of 87mm, and the billet is surface-treated by wire EDM to achieve a surface precision of grade 4 or higher, and the roughness of the billet surface is processed. not lower than 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 at 80°C for 30 minutes, and then apply a 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 0.2mm. After coating, the blank is dri...

Embodiment 2

[0017] The raw materials are prepared according to atomic percentage of titanium 47%, nickel 44% and niobium 9%, and smelted under vacuum condition to make a titanium-nickel-niobium alloy ingot. The ingot was annealed at 800°C for 5 hours. The titanium-nickel-niobium alloy bulk material is wire-cut into billets with a cross-section of 9.3 × 9.3mm and a length of 87mm, and the billet is surface-treated by wire-cutting method to achieve surface accuracy of grade 4 or higher, and the roughness of the billet surface is processed. not lower than 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 at 65°C for 50 minutes, and then apply a 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 20 minutes. If there are defects such as falling coating, scra...

Embodiment 3

[0020] The raw materials are prepared according to atomic percentages of titanium, 45%, and niobium, 5%, and smelted under vacuum conditions to make titanium-nickel-niobium alloy ingots. The ingot was annealed at 900°C for 4.5 hours. The titanium-nickel-niobium alloy bulk material is wire-cut into billets with a cross-section of 9.3 × 9.3mm and a length of 87mm, and the billet is surface-treated by wire-cutting method to achieve surface accuracy of grade 4 or higher, and the roughness of the billet surface is processed. should be no less than 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 at 100°C for 20 minutes, and then apply a 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 0.4mm. After coating, the blank is dried at a temperature of 90 ° C for 30 minutes. If there are defects such as falling coating, sc...

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Abstract

The invention is a manufacturing method for a kind of micron tiny crystal titanium nickel-niobium shape memorizing alloy block materials, 45%-50% titanium, 40%-45% nickel, 5%-10% niobium are melted and produced into titanium nickel-niobium alloy cast ingot, and cuts the titanium nickel-niobium alloy block material into blank, and carries on surface finish process, and paints with glass lubricate, uses isometric curved squeezing mould with 90-120 degrees channel angle, the mould cavity surface is painted with black lead lubricate, the blank and mould are heated and carries on temperature reservation, and takes them out to be squeezed at the same time, finally gets the product. The invention solves the problem that the bad plastic property of titanium nickel-niobium shape memorizing alloy in room temperature, enhances the alloy mechanical performance, and lowers the cost.

Description

Technical field: [0001] The invention relates to a method for preparing a micron fine-grained titanium-nickel-niobium (TiNi-Nb) shape memory alloy bulk material, which is used to obtain a titanium-nickel-niobium alloy bulk material that improves the low-temperature plasticity, strength and shape memory performance of the shape memory alloy, Further, the practical engineering application value of the shape memory alloy in the fields of aerospace, medical care and civil industry is improved. It belongs to the technical field of metal materials and metallurgy. Background technique: [0002] Since its appearance in the early 1970s, shape memory alloys have been widely valued by the material industry and have shown great application prospects in civil industry, aerospace, nuclear industry, biomedicine and other fields. TiNi-Nb alloys have many excellent properties, such as: good mechanical properties (high specific strength, good thermal strength, high fatigue strength), extreme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C14/00C22C30/00C22F1/18
Inventor 程先华谢超英向国权
Owner SHANGHAI JIAO TONG UNIV
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