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Wide-temperature-range hyperelastic titanium-zirconium-niobium-tantalum shape memory alloy and preparation method thereof

A memory alloy, super-elastic technology, applied in the titanium zirconium niobium tantalum shape memory alloy material, the new quaternary Ti-Zr-based shape memory alloy field, to achieve the effect of improving X-ray visibility, easy positioning and tracking, and good plasticity

Active Publication Date: 2014-09-10
BEIHANG UNIV +1
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  • Application Information

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Problems solved by technology

The patent application document with the application number CN201210159967 provides a titanium-zirconium-niobium-iron shape memory alloy, which consists of 10-40 at.% zirconium, 5-20 at.% niobium, 0.1-10 at.% iron and the rest of titanium composition, its maximum room temperature superelasticity is 3.1%, and its maximum shape memory effect is 4.1%, but there is no report of wide temperature range superelasticity

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  • Wide-temperature-range hyperelastic titanium-zirconium-niobium-tantalum shape memory alloy and preparation method thereof
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  • Wide-temperature-range hyperelastic titanium-zirconium-niobium-tantalum shape memory alloy and preparation method thereof

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preparation example Construction

[0041] The present invention also provides a preparation method of a titanium-zirconium-niobium-tantalum shape memory alloy, comprising the following steps:

[0042] The first step: use titanium sponge particles with a purity of 99.7%, zirconium particles with a purity of 99.7%, master alloy Nb-Ti chips with a purity of 99.9%, and master alloy Nb-Ta chips with a purity of 99.9% as raw materials, according to 2 to 4 at.% Ta, 20 at.% Zr, 10 at.% Nb, and the rest are the composition ratios of Ti, and each raw material is prepared.

[0043]Step 2: After mixing all raw materials evenly, press cold isostatic pressing (CIP) into a rod with a diameter of 40mm, and then perform vacuum degassing. The cold isostatic pressing pressure is 280MPa, the holding time is 10 minutes, the vacuum degassing temperature is 750°C, the holding time is 5 minutes, and the vacuum degree is 5×10 -3 Pa.

[0044] Step 3: Weld the bar after vacuum degassing into a consumable electrode with a length of 650 ...

Embodiment 1

[0055] Example 1: Preparation of Ti-20Zr-10Nb-4Ta alloy material with wide temperature range superelasticity;

[0056] The first step: use titanium sponge particles with a purity of 99.7%, zirconium sponge particles with a purity of 99.7%, master alloy Nb-Ti chips with a purity of 99.9%, and master alloy Nb-Ta chips with a purity of 99.9% as raw materials, according to 4at.% Ta, 20 at.% Zr, 10 at.% Nb, and the rest are the composition ratios of Ti to prepare each raw material.

[0057] Step 2: After mixing all raw materials evenly, press cold isostatic pressing (CIP) into a rod with a diameter of 40mm, and then perform vacuum degassing. The cold isostatic pressing pressure is 280MPa, the holding time is 10 minutes, the vacuum degassing temperature is 750°C, the holding time is 5 minutes, and the vacuum degree is 5×10 -3 Pa.

[0058] Step 3: Weld the bar after vacuum degassing into a consumable electrode with a length of 650 mm in a vacuum consumable arc melting furnace and...

Embodiment 2

[0069] Example 2: Preparation of Ti-20Zr-10Nb-4Ta Alloy Material with High Temperature Shape Memory Effect

[0070] According to the preparation method of Example 1, the cooling in air to room temperature in the seventh step is replaced by quenching in water, so as to obtain a titanium-zirconium-niobium-tantalum alloy plate with high-temperature shape memory effect.

[0071] Use a low-speed cutting saw to cut out the titanium, zirconium, niobium, and tantalum shape memory alloy material with a size of 1×1×1.5 mm. 3 As a phase transition test sample, the martensitic phase transition temperature was measured with a NETZSCH STA449 differential scanning calorimeter; the wire cutting method was used to cut out a tensile gauge section with a length of 30 mm, a width of 1.5 mm, and a thickness of 1 mm. Tensile specimens are used as mechanical performance test samples, and the tensile test is carried out at room temperature using a SANS CMT5504 universal material testing machine wit...

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Abstract

The invention discloses a wide-temperature-range hyperelastic titanium-zirconium-niobium-tantalum shape memory alloy and a preparation method thereof. The wide-temperature-range hyperelastic titanium-zirconium-niobium-tantalum shape memory alloy consists of the following biosafety elements in percentage by atom: 20% of zirconium (Zr), 10% of niobium (Nb), 2-4% of tantalum (Ta) and the balance of titanium (Ti). Through different thermal treatment processes, the alloy has different functional characteristics of wide-temperature-range hyperelasticity and high-temperature shape memory effect, namely, the Ti-20Zr-10Nb-(2-4)Ta is of a beta phase at room temperature after annealing at 600 DEG C and air cooling and has a wide temperature range (from -196 DEG C to 135 DEG C) and hyperelasticity, and the maximum room-temperature hyperelasticity is 4.9%, and the highest hyperelasticity is obtained at 50 DEG C and reaches 5.0%; the Ti-20Zr-10Nb-(2-4)Ta is of an alpha phase at room temperature after annealing at 600 DEG C and quenching in water and has a high-temperature shape memory effect, the peak temperature of inverse martensite phase transformation is 97-130 DEG C, and the maximum shape memory effect is 3.34%.

Description

technical field [0001] The invention belongs to the technical field of shape memory alloys, and relates to a shape memory alloy material of titanium, zirconium, niobium, and tantalum. By adding 2 to 4% of Ta in the Ti-20Zr-10Nb (atomic percentage at.%, the same below) alloy, A new quaternary Ti-Zr based shape memory alloy was prepared. Background technique [0002] At present, all commercial superelastic shape memory alloys have extremely limited temperature range: Ti-Ni has superelasticity at -20~80℃, Fe-Ni-Co-Al has superelasticity at less than 50℃, Cu-Al- When Mn is less than 60°C, it has superelasticity. They are superelastic only in a narrow temperature range, which greatly limits their fields of application. Therefore, it is necessary to develop a shape memory alloy with superelasticity in a wide temperature range, which is very good in many fields such as space (-150-120°C), automobile (-50-150°C), and shock resistance (-50-50°C). application prospects. [0003] G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00
Inventor 李岩姚礼
Owner BEIHANG UNIV
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