Cobalt-nickel-iron-gallium shape memory alloy material

A memory alloy, iron gallium technology, applied in the field of cobalt-nickel-iron-gallium shape memory alloy materials, can solve the problems of small brittleness, difficult processing and deformation, and inability to be practically applied.

Inactive Publication Date: 2007-11-28
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ternary CoNiGa series alloy is a high-temperature shape memory alloy with good comprehensive properties. Its martensitic and reverse martensitic phase transition temperatures vary in a wide range with different compositions, and its single crystal material has good shape memory properties. and superelastic properties, and the cost is relatively low. Although the alloy polycrystalline material is less brittle than NiMnGa, it is still difficult to process and deform, and cannot be practically applied.

Method used

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  • Cobalt-nickel-iron-gallium shape memory alloy material
  • Cobalt-nickel-iron-gallium shape memory alloy material
  • Cobalt-nickel-iron-gallium shape memory alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Making 50g Co 46 Ni 23 Fe 2 Ga 29 Shape memory alloy material

[0036] Step 1: Weighing and proportioning

[0037] Press Co 46 Ni 23 Fe 2 Ga 29 Atomic ratio weighed 21.9 grams of cobalt with a purity of 99.9%, 10.9 grams of nickel with a purity of 99.9%, 0.9 grams of iron with a purity of 99.9%, and 16.3 grams of gallium with a purity of 99.99%.

[0038] Step 2: smelting, casting rod

[0039] Put the weighed nickel, manganese, iron, and gallium blocks into a non-consumable vacuum arc furnace, and vacuumize to 3×10 -3 Pa, filled with high purity argon to 0.7×10 5 Pa.

[0040] Then, the raw materials are smelted repeatedly at 1800℃ for 4 times to make the composition uniform and make Co 46 Ni 23 Fe 2 Ga 29 Shape memory alloy ingots;

[0041] The above-mentioned ingot is melted at 1800°C and directly poured into a water-cooled copper mold of a non-consumable vacuum electric arc furnace; a rapidly solidified cast rod with a diameter of 5 mm is made.

[0042] Step 3: ...

Embodiment 2

[0048] Example 2: Making 50g Co 46 Ni 19 Fe 6 Ga 29 Shape memory alloy material

[0049] Step 1: Weighing and proportioning

[0050] Press Co 46 Ni 19 Fe 6 Ga 29 Atomic ratio weighed 21.9 grams of cobalt with a purity of 99.9%, 9.0 grams of nickel with a purity of 99.9%, 2.7 grams of iron with a purity of 99.9%, and 16.3 grams of gallium with a purity of 99.99%.

[0051] Step 2: smelting, casting rod

[0052] Put the weighed nickel, manganese, iron, and gallium block materials into the non-consumable vacuum electric arc furnace and vacuumize to 5×10 -3 Pa, filled with high purity argon to 0.7×10 5 Pa;

[0053] Then, the raw materials are smelted 5 times at 2000℃ to make the composition uniform and make Co 46 Ni 19 Fe 6 Ga 29 Shape memory alloy ingots;

[0054] Then add the above Co 46 Ni 19 Fe 6 Ga 29 After the shape memory alloy ingot is melted at 2000°C, it is directly poured into the water-cooled copper mold of the non-consumable vacuum arc furnace; a rapidly solidified cast ro...

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Abstract

A kind of CoNiFeGa figure memory alloy material, the structural formula of it is Co46Ni25-xFexGa29, the atomy percent of X is form 1 to 6. The alloy in this patent is apparently preponderant on price, comparing with TiNiPd system high temperate figure memory alloy, which owns the best performance at present. The shape performance of it is one to two point five times of that of the ternary CoNiGa alloy, not containing Fe. The appearance transformation temperate against martensite of Co46Ni25-xFexGa29 in this patent is from 260 to 390deg.C, the bending intension of it at room temperate is from 350 to 410MPa, the compression shape transformation rate is from 18 to 30 percent, the shape memory effect is form 3.5 to 4.6 percent.

Description

Technical field [0001] The invention relates to a cobalt nickel iron gallium (Co 46 Ni 25-x Fe x Ga 29 ) Shape memory alloy material, by adding Fe element to replace part of Ni element to change and control Co 46 Ni 25-x Fe x Ga 29 Phase transition temperature, and make Co 46 Ni 25-x Fe x Ga 29 The content of γ-phase is controlled within the range of 5-15%, so as to ensure that the Co 46 Ni 25-x Fe x Ga 29 It has good plasticity under the premise of high shape memory performance. Background technique [0002] Generally, shape memory alloys whose inverse martensitic transformation temperature (driving temperature) is higher than 200℃ are called high-temperature shape memory alloys. This type of material is used in aerospace, firefighting, chemical , Nuclear industry and other fields have been widely used. [0003] The ternary CoNiGa series alloy is a high temperature shape memory alloy with good comprehensive properties. Its martensite and reverse martensite transformation tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02B22D21/00C22F1/16
Inventor 李岩辛燕徐惠彬
Owner BEIHANG UNIV
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