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Micron fine-grained titanium-nickel-copper alloy block constant-diameter corner extrusion preparation method

A copper alloy block, titanium-nickel technology, applied in the field of radial bending angle extrusion preparation, can solve problems such as poor room temperature plasticity of titanium-nickel-copper shape memory alloy, and achieves solving the problem of poor room temperature plasticity, improving flow uniformity, and simple process method Effect

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 preparation method of equal-diameter angular extrusion of micron fine-grained titanium-nickel-copper alloy blocks, which can solve the problem of poor plasticity of titanium-nickel-copper shape memory alloys at room temperature, and improve Its mechanical properties, while reducing the cost of high-temperature shape memory alloy processing, improve 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 55% titanium, 35% nickel, and 10% copper. Under the protection of argon, they are melted by vacuum magnetic levitation induction method in a cold-walled copper crucible to make titanium-nickel-copper alloy ingots. Each The mass of the ingot is about 90 grams. The ingot was annealed at 850°C and held for 4 hours. Wire-cut the titanium-nickel-copper 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, and the surface roughness of the blank is not lower than R a = 1.25 to 2.5 μm. Clean the surface of the blank with acetone, 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 and the thickness of the coating is about 0.2mm. After coating, dry the blank at 90°C for 20 minutes. If ther...

Embodiment 2

[0017] The raw materials are prepared according to the atomic percentage of 50% titanium, 43% nickel and 7% copper, and are smelted under vacuum conditions to make titanium-nickel-copper alloy ingots. The ingot was annealed at 800°C and kept for 5 hours. Wire-cut the titanium-nickel-copper 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, and the surface roughness of the blank is not 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 minutes. If there are defects such as falling coating, scratches...

Embodiment 3

[0020] The raw materials are prepared according to the atomic percentage of 48% titanium, 47% nickel, and 5% copper, and are melted under vacuum conditions to make titanium-nickel-copper alloy ingots. The ingot was annealed at 900°C and kept for 4.5 hours. Wire-cut the titanium-nickel-copper 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. The surface roughness of the blank should not be 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, it should be re...

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Abstract

The invention is an equant bending-angle extrusion preparing method of micron microlite Ti, Ni-Cu alloy block, vacuum-melting Ti, Ni and Cu, where their atomic percents are 48-55%, 35-47% and 5-10% in turn, to make the Ti, Ni-Cu alloy cast ingot, cutting the alloy block into blanks, polishing and coating glass lubricant, adopting the equant bending-angle extrusion mould whose extrusion channel angle is 90-120 degrees and whose molding cavity surface is coated with graphitic lubricant, heating the blanks and the mould and preserving heat, at the same time taking out the blanks and the mould from the heating furnace for equant bending-angle extrusion and finally obtaining good -intensity and -plasticity Ti, Ni-Cu alloy block.

Description

Technical field: [0001] The invention relates to a method for preparing micron fine-grained titanium-nickel-copper (TiNi-Cu) alloy bulk material by equal-diameter angle extrusion, which is used to obtain titanium-nickel-copper for improving the low-temperature plasticity, strength and shape memory performance of shape memory alloys Alloy bulk, and then improve the practical engineering application value of the shape memory alloy in the fields of aerospace, medical and health, and civil industry. 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-Cu alloy has many excellent properties, such as: good mechanical properties (high specific strength, good thermal strength, ...

Claims

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Application Information

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IPC IPC(8): B21C23/01B21C23/04B21C23/32B21C29/00
Inventor 程先华谢超英向国权
Owner SHANGHAI JIAO TONG UNIV
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