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NbTi/TiNi memory alloy composite material and preparation method thereof

A technology of composite materials and memory alloys, which is applied in the field of memory alloy composite materials with in-situ self-generated ultrafine eutectic structure in the cast state and its preparation field, which can solve the limitations of the shape memory effect of TiNi alloys, the inability of superelasticity to be fully coupled with the matrix Memory alloy composite material functional properties and other issues, to achieve the effect of good interface bonding and high interface bonding strength

Inactive Publication Date: 2010-08-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These shortcomings may lead to the shape memory effect of TiNi alloy, and the superelasticity cannot be fully coupled with the matrix, which limits people's understanding of other functional properties of memory alloy composites.

Method used

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  • NbTi/TiNi memory alloy composite material and preparation method thereof
  • NbTi/TiNi memory alloy composite material and preparation method thereof
  • NbTi/TiNi memory alloy composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0045] The preparation method of NbTi / TiNi memory alloy composite material provided by the invention can comprise the following specific steps:

[0046] (1) Select niobium with a purity of 99.0wt.%-99.9wt.% according to the composition ratio of the composite material, titanium with a purity of 99.0wt.%-99.9wt.%, titanium with a purity of 99.0wt.%-99.9wt.% nickel;

[0047] (2) Putting the above-mentioned composite material components into a smelting furnace, smelting to obtain the NbTi / TiNi memory alloy composite material, and casting it into an ingot;

[0048] (3) In the vacuum furnace (the ultimate vacuum degree is 6.7×10 -4 Pa), the ingot was subjected to homogenization annealing treatment for 10 hours at 950° C.;

[0049] (4) Hot forging the annealed ingot at 850°C into rod-shaped material (rod-shaped ingot) or cake-shaped material (cake-shaped ingot);

[0050] (5) Plastic processing is repeated on the rod-shaped material or cake-shaped material obtained by hot forging u...

Embodiment 1

[0051] Example 1: Nb 20 Ti 42 Ni 38 memory alloy composite

[0052] (1) by Nb content 20at.%, the proportioning of Ti and Ni atomic ratio 21: 19 selects the niobium that purity is 99.9wt.%, the titanium that purity is 99.9wt.%, the nickel that purity is 99.9wt.%, wherein , the sum of the atomic percentages of Nb, Ti and Ni is 100%;

[0053] (2) Put the above-mentioned alloy components into a vacuum melting furnace, and melt them into ingots under the protection of argon at -0.05MPa;

[0054] (3) In the vacuum furnace, the ingot is subjected to homogenization annealing treatment for 10 hours at 950° C.;

[0055] (4) Hot forging the annealed ingot into a rod-shaped material (rod-shaped ingot) at 850°C;

[0056] (5) At 600°C, the rod-shaped material obtained by hot forging is hot-drawn to obtain a wire with a diameter of 1mm;

[0057] (6) annealing the wire material obtained in step (5) at 750° C. for 3 minutes;

[0058] (7) cold drawing the wire material obtained in step ...

Embodiment 2

[0067] Example 2: Nb 20 Ti 37 Ni 43 memory alloy composite

[0068] (1) by Nb content 20at.%, the ratio of Ti and Ni atomic ratio 37:43 selects the niobium that purity is 99.9wt.%, the titanium that purity is 99.9wt.%, the nickel that purity is 99.9wt.%, wherein , the sum of the atomic percentages of Nb, Ti and Ni is 100%;

[0069] (2) Put the above-mentioned alloy components into a smelting furnace, melt and cast them into button-shaped ingots under the protection of -0.5MPa argon;

[0070] (3) In the vacuum furnace, the ingot is subjected to homogenization annealing treatment for 10 hours at 950° C.;

[0071] (4) At 850°C, hot forge the annealed button-shaped ingot radially into a cake-shaped material (cake-shaped ingot) with a thickness of 10 mm;

[0072] (5) cold rolling the cake-shaped material obtained by hot forging, the cold rolling deformation is 50%-60%;

[0073] (6) annealing the cold-rolled material at 800° C. for 20 minutes;

[0074] (7) Step (5) and step (...

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Abstract

The invention relates to an NbTi / TiNi memory alloy composite material and a preparation method thereof. The memory alloy composite material comprises the following components calculated by the total weight of the memory alloy composite material: Nb element with the atomic percentage of 18-22%, and Ti element and Ni element with the atomic rate of 0.3: 1-1.5: 1, wherein the sum of the atomic percentage of the three elements of Ti, Ni and Nb is 100%. The memory alloy composite material has the special functional features of high yield strength, strain soft mode, linear super-elasticity, double-stress platform and the like. The invention further relates to the preparation method of the NbTi / TiNi memory alloy composite material, which comprises the following steps: selecting elementary substances of niobium, titanium and nickel with the purity of above 99.0% by weight according to the mixture ratio of the components of the NbTi / TiNi memory alloy composite material, placing the elementary substances of niobium, titanium and nickel into a smelting furnace with the vacuum degree of being higher than 10-1Pa or inert gas protection, and smelting for forming the NbTi / TiNi memory alloy composite material.

Description

technical field [0001] The invention relates to a NbTi / TiNi memory alloy composite material and a preparation method thereof, in particular to a memory alloy composite material with the NbTi phase as the reinforcing phase and the TiNi phase as the matrix, which has an in-situ self-generated ultrafine eutectic structure in the as-cast state. Materials and their preparation methods. Background technique [0002] As a new type of metal functional material, TiNi-based shape memory alloy (SMA) has been widely used in aerospace, medical, industry, life and other fields due to its shape memory effect, high damping, superelasticity and other properties. However, when TiNi memory alloy has excellent damping properties, it is generally in a martensitic state, and its yield strength is only 100-200 MPa. Such a low yield strength greatly limits its application as a damping material in a high-load environment. In addition, the micro-actuator made of TiNi memory alloy superelasticity als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C14/00C22C1/02
Inventor 崔立山姜大强姜江郝世杰刘明于存王珊郑雁军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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