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Microcrystal nickel aluminum-manganese shape memory alloy block material preparation method

A memory alloy, crystalline nickel-aluminum technology, applied in the fields of metal materials and metallurgy, can solve problems such as poor plasticity at room temperature, and achieve the effects of improving mechanical properties, simple process method, and improving yield.

Inactive Publication Date: 2005-08-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to address the deficiencies of the prior art, to provide a method for preparing a micron-grained nickel-aluminum-manganese shape memory alloy bulk material, to solve the problem of poor plasticity of the nickel-aluminum-manganese shape memory alloy at room temperature, to improve its mechanical properties, and at the same time reduce the The cost of high temperature shape memory alloy processing to 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 50% nickel, 16% aluminum and 34% manganese. Under the protection of argon, they are melted by vacuum magnetic levitation induction method in a cold-walled manganese crucible to make nickel-aluminum-manganese alloy ingots. Each The mass of the ingot is about 90 grams. The ingot was annealed at 1100°C and kept for 48 hours. Wire-cut the nickel-aluminum-manganese alloy block material into a blank with a cross-section of 9.3×9.3mm and a length of 87mm, and perform surface grinding on the blank to achieve a surface precision of 4 or above, 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 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, the blank is dried at 90°C for 20 mi...

Embodiment 2

[0017] Raw materials are prepared according to the atomic percentage of 50% nickel, 20% aluminum, and 30% manganese, and are smelted under vacuum conditions to make nickel-aluminum-manganese alloy ingots. The ingot was annealed at 1150°C and kept for 72 hours. Wire-cut the nickel-aluminum-manganese alloy block material into a blank with a cross-section of 9.3×9.3mm and a length of 87mm, and perform surface grinding on the blank to achieve a surface precision of 4 or above, 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, s...

Embodiment 3

[0020] Raw materials are prepared according to the atomic percentage of 50% nickel, 18% aluminum, and 32% manganese, and are smelted under vacuum conditions to make nickel-aluminum-manganese alloy ingots. The ingot was annealed at 1150°C and kept for 72 hours. Wire-cut the nickel-aluminum-manganese alloy block material into a billet with a cross-section of 9.3×9.3mm and a length of 87mm, and perform surface grinding on the billet to achieve a surface accuracy of above grade 4. The surface roughness of the billet should not be less 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 a temperature of 90°C for 30 minutes. If there are defects such as falling coating, scratches, ...

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Abstract

The invention discloses a microcrystal nickel aluminum-manganese shape memory alloy block material preparation method which comprises, preparing the raw materials by the atom percentage of nickel 50%, aluminum 16-20%, manganese 30-34%, smelting under vacuum condition, obtaining nickel-aluminium-manganese alloy cast ingot, cutting the nickel-aluminium-manganese alloy into blanks, carrying out surface smoothness treatment, and coating glass lubricant, using equal diameter curved corner compression die with extruding channel angle being 90-120 degrees, coatint the die molding volume surface with graphite lubricant, subjecting the blank and die arrangement respectively to heating and heat preservation, carrying out equal diameter curved corner extrusion simultaneously after being taken out of the heating-furnace.

Description

Technical field: [0001] The invention relates to a method for preparing a micron-grained nickel-aluminum-manganese (NiAl-Mn) shape memory alloy block, which is used to obtain a nickel-aluminum-manganese alloy block that improves the low-temperature plasticity, strength and shape memory performance of the shape memory alloy, 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. NiAl-Mn alloy has many excellent properties, such as: good mechanical properties (high specific strength, good thermal strength, high fat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22F1/10
Inventor 程先华向国权
Owner SHANGHAI JIAO TONG UNIV
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