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Nb nanobelt/martensitic NiTi memory alloy matrix composite filament and production method thereof

A technology of memory alloy and nanoribbon, which is applied in the field of composite materials, can solve the problem that the ultra-large tensile elastic strain of nanowires cannot be retained, and achieve the effect of controlling the superconducting critical temperature and critical magnetic field and improving superconducting performance

Inactive Publication Date: 2015-09-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, a Nb nanowire / superelastic NiTi memory alloy composite material was reported (Science 339, 1191, 2013), and it was found for the first time that the Nb nanowire exhibited a super large tensile elastic strain (4.2-6.5% ), during the unloading process, the ultra-large tensile elastic strain of the Nb nanowires is released, so that the ultra-large tensile elastic strain of the nanowires in the free-state composite after unloading cannot be retained, which limits its application

Method used

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  • Nb nanobelt/martensitic NiTi memory alloy matrix composite filament and production method thereof
  • Nb nanobelt/martensitic NiTi memory alloy matrix composite filament and production method thereof
  • Nb nanobelt/martensitic NiTi memory alloy matrix composite filament and production method thereof

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preparation example Construction

[0044] The preparation method of the Nb nanobelt / martensitic state NiTi memory alloy matrix composite material wire material provided by the invention can comprise the following concrete steps:

[0045] (1) Select niobium with a purity of more than 99wt.% according to the composition ratio of the Nb nanobelt / martensitic NiTi memory alloy matrix composite material wire, and titanium with a purity of 99wt.% or more. nickel;

[0046] (2) Put the selected elemental nickel, titanium and niobium in a vacuum higher than 10 -1 Pa or a smelting furnace protected by an inert gas, and then cast to obtain a Nb / NiTi ingot;

[0047] (3) In the vacuum furnace (the ultimate vacuum degree is 6.0×10 -4 Pa), performing a homogenization annealing treatment on the ingot at 800-1000°C (preferably 950°C) for 5-50 hours (preferably 10 hours);

[0048] (4) Hot forging the ingot after the homogenization annealing treatment into a rod-shaped profile at 800-1000°C (preferably 850°C);

[0049] (5) War...

Embodiment 1

[0054] This embodiment provides a kind of Nb nanobelt / martensitic state NiTi memory alloy matrix composite material wire material, and a kind of Nb nanobelt 2.8 in free state Nb nanobelt / martensitic state NiTi memory alloy matrix composite material material material A method for super large tensile elastic strain, which is achieved by the following steps:

[0055] (1) According to the ratio of Nb content 10at.%, Ti and Ni atomic ratio 1:1, select niobium with a purity of 99.9wt.%, titanium with a purity of 99.9wt.%, and nickel with a purity of 99.9wt.%. , the sum of the atomic percentages of Nb, Ti, and Ni is 100%;

[0056] (2) Put the above-mentioned composite material components elemental nickel, titanium, and niobium into a vacuum melting furnace, melt and cast them into ingots under the protection of 0.5MPa argon;

[0057] (3) In the vacuum furnace, the ingot is subjected to homogenization annealing treatment for 10 hours at 950° C.;

[0058] (4) Hot forging the annealed...

Embodiment 2

[0072] The present embodiment provides a kind of method that regulates free state Nb nanobelt / martensitic state NiTi memory alloy matrix composite material wire material and Nb nanobelt is retained tensile elastic strain size, and it is realized by the following steps:

[0073] The composite material filament obtained by step (10) in Example 1 is subjected to multi-step uniaxial stretching plus-unloading cycle deformation at room temperature with a deformation amount of 1.5%, 3.0%, 4.5%, 6.2%, and 8.7%. .

[0074] Figure 7 is the stress-strain curve of the multi-step uniaxial tension plus-unload cycle deformation of the composite filament.

[0075] Figure 8 In the multi-step uniaxial tensile loading-unloading cyclic deformation process, the relationship curve between the tensile elastic strain of the Nb nanoribbon along the filament axis and the macroscopic tensile strain of the sample is obtained from Figure 8 It can be seen that after tensile unloading, 0.4%, 1.1%, 1.4...

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Abstract

The invention provides Nb nanobelt / martensitic NiTi memory alloy matrix composite filament and a production method thereof. The Nb nanobelt / martensitic NiTi memory alloy matrix composite filament comprises the following components: 7-15% (atomic percent) of Nb, Ti and Ni with the atom ratio of (0.8-1.2):1, wherein the sum of atomic percents of Ti, Ni and Nb is 100%. The Nb nanobelt / martensitic NiTi memory alloy matrix composite filament is prepared by carrying out the following steps: selecting simple substances nickel, titanium and niobium with purity of more than 99wt%; smelting and casting, so that ingot casting is obtained; homogenizing and annealing the ingot casting; and then carrying out hot forging and moulding; carrying out plastic processing, annealing treatment, at least once uniaxial drawing-loading-unloading circular deformation treatment on a profile subjected to hot forging, wherein deformation is 1-9%, so that the Nb nanobelt / martensitic NiTi memory alloy matrix composite filament is obtained. The Nb nanobelt / martensitic NiTi memory alloy matrix composite filament can reserve great tensile elastic strain of Nb nanobelt in a free-state composite material, superconduction critical temperature of the free-state composite material is increased, and a magnetic field of the free-state composite material is enhanced.

Description

technical field [0001] The invention relates to a Nb nanobelt / martensitic NiTi memory alloy matrix composite material wire and a preparation method thereof, belonging to the field of composite materials. Background technique [0002] The physical and chemical properties of metal materials are functions of elastic strain. If a metal material can exhibit super large elastic strain, it will not only have super high strength (elastic modulus × elastic strain), but also be expected to have specific physical and chemical properties. . However, the elastic strain limit of traditional bulk metal materials is usually less than 1%, and the physical and chemical properties cannot be significantly changed due to the small elastic strain. It has been shown that a single free-state nanowire can exhibit ultra-large elastic strain (4-7%), but its application is limited due to its small size. Nanowires can be combined with other metals to form composite materials, but nanowires lose their ...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C30/00C22C1/02C22F1/10C22F1/16
Inventor 郝世杰崔立山郭芳敏姜大强
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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