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Wide-temperature-range high-strength linear-elasticity metallic nano material and preparation method and application thereof

A metal nano, nanocrystalline technology, applied in the field of nano materials, can solve problems such as inability to meet requirements, difficult to precisely control device deformation, and dissipation of mechanical energy.

Active Publication Date: 2017-09-19
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For traditional bulk metal materials, the elastic deformation limit is usually less than 1% and cannot meet the requirements
Although the superelastic TiNi shape memory alloy has a superelastic deformation of about 8%, its superelastic deformation is nonlinear, so it is very difficult to accurately control the deformation of the device
[0003] CN101805843A discloses a composite material of NbTi nanofiber reinforced TiNi shape memory alloy. Although the strength of the composite material is improved, due to the positive-reverse stress-induced martensitic transformation of the matrix during the stretching and unloading process , which not only dissipates a large amount of mechanical energy, but also shortens the operating temperature range of the material (15°C to 50°C, when the operating temperature is lower than M S point, the matrix is ​​martensite without superelasticity)

Method used

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  • Wide-temperature-range high-strength linear-elasticity metallic nano material and preparation method and application thereof
  • Wide-temperature-range high-strength linear-elasticity metallic nano material and preparation method and application thereof
  • Wide-temperature-range high-strength linear-elasticity metallic nano material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0055] The present embodiment provides the wire material (composition is Ti) of the metal nanomaterial of wide temperature domain high strength linear superelasticity 45 Ni 55 ), which is prepared by the following steps:

[0056] (1) Titanium with a purity of 99.9wt.% and nickel with a purity of 99.9wt.% are selected according to the ratio of Ti and Ni atomic ratio 0.9:1, wherein the sum of the atomic percentages of Ti and Ni is 100%;

[0057] (2) Put the above material components into a vacuum melting furnace, melt and cast them into NiTi binary alloy ingots under the protection of 0.5MPa argon;

[0058] (3) In a vacuum furnace, the obtained NiTi binary alloy ingot is subjected to homogenization annealing treatment for 10 hours at 950° C.;

[0059] (4) Hot forging the ingot after homogenizing annealing into a rod-shaped profile at 850°C;

[0060] (5) At 550°C, the rod-shaped profile obtained by hot forging is hot-drawn to obtain a wire with a diameter of 0.55 mm;

[0061]...

Embodiment 2

[0072] The present embodiment provides the wire material (composition is Ti) of the metal nanomaterial of wide temperature domain high strength linear superelasticity 45 Ni 55 ), which is prepared by the following steps:

[0073] The steps (1)-(8) in this embodiment are the same as the steps (1)-(8) in Example 1.

[0074] (9) The wire material obtained in step (8) was subjected to a 10% uniaxial tensile deformation treatment at 20° C. to obtain the metal nanomaterial wire material of this embodiment.

[0075] Figure 7 For the two-dimensional high-energy X-ray diffraction spectrum of the metal nanomaterial wire in this embodiment after implementing uniaxial stretching and 10% deformation, from Figure 7 It can be seen that after the metal nanomaterial wire is deformed by 10% uniaxial stretching, the metal nanomaterial is in the martensitic phase (B19'-NiTi) at 20 °C, which is composed of preferentially oriented martensite variants.

[0076] Figure 8 The tensile stress-st...

Embodiment 3

[0078] The present embodiment provides the wire material (composition is Ti) of the metal nanomaterial of wide temperature domain high strength linear superelasticity 45 Ni 55 ), which is prepared by the following steps:

[0079] Steps (1)-(7) of this embodiment are the same as steps (1)-(7) in Embodiment 1.

[0080] (8) Carrying out crystallization annealing treatment at 450° C. for 10 minutes on the wire material obtained in step (7);

[0081] Figure 9 It is the bright-field image of the transmission electron microscope of the longitudinal section of the cold-drawn wire after crystallization and annealing at 450 ° C for 10 minutes. Figure 9 It can be seen that the metal nanomaterial is composed of uniformly distributed NiTi nanocrystals, and the average diameter of the grains is 100nm.

[0082] Figure 10 It is the two-dimensional high-energy X-ray diffraction spectrum of the wire after the cold-drawn wire is crystallized and annealed at 450 ° C for 10 minutes, from ...

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Abstract

The invention provides a wide-temperature-range high-strength linear-elasticity metallic nano material and a preparation method and application thereof. The metallic nano material is a wire material, wherein the metallic nano material is composed of, in total, an element Ti and an element Ni with the atomic ratio of Ti to Ni being (0.8:1)-(0.9:1), and the sum of atomic percentages of the Ti and Ni is 100%; and the metallic nano material is a martensite NiTi nano material composed of NiTi nanocrystals which are uniformly distributed, and the martensite NiTi nanocrystals are formed by martensite variants with preferred orientation. The operating temperature range for the nano material provided by the invention is approximately minus 197 DEG C-50 DEG C, and the material can keep linear elasticity within the temperature range and has the yield strength of 1.2-1.9 GPa and the linear elasticity strain limit of 4.5%-5.4%.

Description

technical field [0001] The invention relates to a wide temperature range high-strength linear elastic metal nano material and its preparation method and application, belonging to the field of nano materials. Background technique [0002] The development of high-performance driving devices not only requires materials to have linear superelastic properties, but also to have high strength properties in a wide temperature range. For traditional bulk metal materials, the requirements cannot be met because their elastic deformation limit is usually less than 1%. Although the superelastic TiNi shape memory alloy has a superelastic deformation of about 8%, its superelastic deformation is nonlinear, so it is very difficult to precisely control the deformation of the device. [0003] CN101805843A discloses a composite material of NbTi nanofiber reinforced TiNi shape memory alloy. Although the strength of the composite material is improved, due to the positive-reverse stress-induced m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10B21C1/00
CPCB21C1/003C22C1/023C22C19/007C22C19/03C22C2200/04C22F1/10
Inventor 郝世杰孙震孔祥广康根发崔立山
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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