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Titanium-niobium shape memory alloy with adjustable negative thermal expansion and preparation method thereof

A technology of negative thermal expansion and memory alloy, which is applied in the field of titanium-niobium shape memory alloy and its preparation, can solve the problems of small negative thermal expansion coefficient of titanium alloy, narrow adjustable range, and insufficient temperature range, etc., and achieve wide applicable temperature range and adjustable temperature. Wide range, enhanced strength effect

Active Publication Date: 2021-03-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in general, the negative thermal expansion coefficient of the above-mentioned titanium alloys is small, the adjustable range is narrow, or the applicable temperature range is not wide enough

Method used

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  • Titanium-niobium shape memory alloy with adjustable negative thermal expansion and preparation method thereof
  • Titanium-niobium shape memory alloy with adjustable negative thermal expansion and preparation method thereof
  • Titanium-niobium shape memory alloy with adjustable negative thermal expansion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] With high purity Ti, Nb and TiO 2 Powder is used as raw material to prepare alloy, and the weight of each component is: Ti: 65.725g; Nb: 34.000g; TiO 2 : 0.275g; the weight percent of each alloy element is: Nb: 34wt%; O: 0.11wt%, and the balance is Ti. The prepared raw materials are placed in a magnetically stirred vacuum non-consumable electric arc furnace for five times of repeated melting to obtain an ingot with uniform composition. The ingot was hot forged into a bar at 900°C with a deformation of 70%. After solution treatment at 950°C for 40 minutes, put it into water for quenching and cooling. Turning removes the scale on the surface of the bar, and then carries out cold rolling deformation with a deformation amount of 95% at room temperature.

[0028] After the above treatment, the obtained alloy is subjected to XRD analysis, and the spectrum is as follows figure 1 As shown, according to the figure, it can be seen that the phase composition is β matrix + a sm...

Embodiment 2

[0031] With high purity Ti, Nb and TiO 2 Powder is used as raw material to prepare alloy, and the weight of each component is: Ti: 61.750g; Nb: 38.000g; TiO 2 : 0.250g; the weight percent of each alloy element is: Nb: 38wt%; O: 0.10wt%, and the balance is Ti. The prepared raw materials are placed in a magnetically stirred vacuum non-consumable electric arc furnace for five times of repeated melting to obtain an ingot with uniform composition. The ingot was hot-forged into a bar at 1000°C with a deformation of 75%. After solid solution treatment at 850°C for 60 minutes, put it into water for quenching and cooling. Turning removes the scale on the surface of the bar, and then carries out cold rolling deformation with a deformation amount of 93% at room temperature.

[0032] After the above treatment, the obtained alloy is subjected to XRD analysis, and the spectrum is as follows figure 1 As shown, according to the figure, it can be seen that the phase composition is β matrix +...

Embodiment 3

[0034] With high purity Ti, Nb and TiO 2 Powder is used as raw material to prepare alloy, the weight of each component is: Ti: 59.880g; Nb: 40.000g; TiO 2 : 0.300g; the weight percent of each alloy element is: Nb: 40wt%; O: 0.12wt%, and the balance is Ti. The prepared raw materials are placed in a magnetically stirred vacuum non-consumable electric arc furnace for five times of repeated melting to obtain an ingot with uniform composition. The ingot was hot forged into a bar at 950°C with a deformation of 80%. After solution treatment at 900°C for 30 minutes, put it into water for quenching and cooling. Turning removes the scale on the surface of the bar, and then carries out cold rolling deformation with a deformation amount of 92% at room temperature.

[0035] After the above treatment, the obtained alloy is subjected to XRD analysis, and the spectrum is as follows figure 1 As shown, according to the figure, it can be seen that the phase composition is β matrix + a small ...

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Abstract

The invention discloses a titanium-niobium shape memory alloy with adjustable negative thermal expansion. The titanium-niobium shape memory alloy comprises, by weight, 34 wt%-40 wt% of Nb, 0.10 wt%-0.12 wt% of O and the balance Ti. The invention also discloses a preparation method of the alloy. The preparation method comprises the following steps that smelting is conducted by using a vacuum non-consumable electric arc furnace to obtain an alloy ingot with uniform components, the alloy ingot is subjected to hot forging to form a bar, and then the bar is subjected to solution treatment at 850-950 DEG C and water-cooled to the room temperature; and then, cold rolling deformation machining is carried out, wherein the deformation amount is 92%-95%. By changing the Nb content within the range of34 wt%-40 wt%, the alloy has an adjustable negative thermal expansion coefficient of -33.0*10^-6 / K--2.0*10^-6 / K within the temperature range of 25 DEG C-300 DEG C, and the alloy has a stable shape memory effect during temperature cycling and is suitable for preparing low-expansion-coefficient components and temperature-sensitive elements such as thermal switches and intelligent valves.

Description

technical field [0001] The invention belongs to titanium alloy preparation technology, in particular to a titanium-niobium shape memory alloy with adjustable negative thermal expansion and a preparation method thereof. Background technique [0002] The phenomenon that the volume or length of an object changes relative to temperature is called thermal expansion. Ordinary materials generally have a positive coefficient of expansion, which is their inherent nature. When there is a large temperature change in the object, on the one hand, it is easy to generate thermal stress, for example, the difference in thermal expansion coefficient between the substrate and the film will generate internal stress, which will affect the physical, electrical and thermal properties of the film; on the other hand, it will cause Components produce obvious dimensional changes, which affects the accuracy of precision instruments, and also leads to the need to leave expansion joints at the joints of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02C22F1/18
CPCC22C14/00C22C1/02C22F1/183C22F1/006
Inventor 陈锋武祥为邹雯倩
Owner SOUTHEAST UNIV
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