Low-phase-transformation-temperature titanium-zirconium-niobium-tantalum shape memory alloy, a preparation method and application thereof

Abstract

The invention provides a novel titanium-zirconium-niobium-tantalum shape memory alloy with a low phase transformation temperature. Based on the total amount of 100 percent, the titanium-zirconium-niobium-tantalum shape memory alloy is prepared from the following components by atomic percent: 15 to 25 percent of zirconium, 11 to 15 percent of niobium, 4.5 to 10 percent of tantalum and the balance of titanium. The reverse martensitic phase transformation temperature is 0 to 45 DEG C, the maximum shape memory effect is 3.9 percent, and an alloy product with a great shape memory effect and good biocompatibility is obtained by certain thermomechanical treatment. According to the titanium-zirconium-niobium-tantalum shape memory alloy, a low-phase-transformation-temperature alloy material is provided to prepare a typical medical straddle nail product by use of an advanced machining technology for application to medical human body orthopaedic implantation, and preparation of connectors, vascular stents, straddle nails and various products in the field of human body implantation medical devices.

Description

Technical field:

[0001] The invention belongs to the technical field of shape memory alloys, and designs and prepares a novel quaternary shape memory alloy whose composition is Ti-(18-25)Zr-(11-13)Nb-(4.5-6)Ta and has a low phase transition temperature, and utilizes The novel alloy prepares human body medical saddle nail products. Background technique

[0002] Due to its unique shape memory effect, shape memory alloys have been widely used in the fields of aerospace, biomedicine, and civil life. Especially in recent years, with the rapid development of human medical orthopedic implants, shape memory alloys have Due to its functional characteristics and mechanical properties, it has developed rapidly in the application of vascular stents and orthopedic implants. As a unique functional characteristic of shape memory alloys, the shape memory effect is caused by the reversible transformation between the low-temperature martensitic phase and the high-temperature parent phase. Th...

Examples

Embodiment 1

[0036] Example 1: Preparation of low phase transition temperature Ti-19Zr-11Nb-4.5Ta composition shape memory alloy material

[0037] The first step: use titanium block (purity ≥99.99%), zirconium block (purity ≥99.99%), niobium sheet (purity ≥99.98%) and tantalum block (purity ≥99.98%) for vacuum consumable arc melting, for Ensure the homogeneity of the composition and smelt more than 5 times to prepare alloy ingots of 1-5 kg ​​level.

[0038] Step 2: Homogenize the ingot in a vacuum heat treatment furnace at 1000°C for more than 6-10 hours to further eliminate component segregation.

[0039] Step 3: Carry out billet forging treatment on the alloy ingot, the billet temperature is 1000-1100°C, the annealing temperature is 850-1000°C, after 3-5 passes of forging, the size is about 30mm×50mm×80mm. material.

[0040] Step 4: Cut the ingot into thin slices with a thickness of 4-6mm along the cross-section of the block by means of wire-cutting mechanical treatment, and perform co...

Embodiment 2

[0048] Embodiment 2: Preparation of Ti-18Zr-13Nb-6Ta composition shape memory alloy material with low phase transition temperature;

[0049] According to the preparation method described in Example 1, a martensitic Ti-18Zr-13Nb-6Ta composition alloy plate was obtained.

[0050] Cut a sheet sample with a size of 5mm×50mm×0.5mm and pass figure 1 The bending method shown performs the shape memory effect measurement. The maximum shape memory effect of the Ti-18Zr-13Nb-6Ta composition alloy is 3.8%, which is equivalent to that of the existing Ti-Zr-based alloys, indicating that the composition alloy has excellent shape memory performance.

[0051] A sample with a size of 1 mm × 1 mm × 0.5 mm was cut from the alloy plate by slow wire cutting, and the phase transition temperature was measured by a NETZSCHSTA449 differential scanning calorimeter. use image 3 From the DSC curve shown, it can be observed that the reverse martensitic transformation temperature of the composition allo...

Embodiment 3

[0053] Example 3: Preparation of Ti-23Zr-12Nb-4.5Ta composition shape memory alloy material with low phase transition temperature;

[0054] According to the preparation method described in Example 1, a martensitic Ti-23Zr-12Nb-4.5Ta composition alloy plate was obtained.

[0055] Cut a sheet sample with a size of 5mm×50mm×0.5mm and pass figure 1 The bending method shown performs the shape memory effect measurement. The maximum shape memory effect of the Ti-23Zr-12Nb-4.5Ta composition alloy is 3.5%, which is equivalent to that of the existing Ti-Zr-based alloys, indicating that the composition alloy has excellent shape memory performance.

[0056] A sample with a size of 1 mm × 1 mm × 0.5 mm was cut from the alloy plate by slow wire cutting, and the phase transition temperature was measured by a NETZSCHSTA449 differential scanning calorimeter. use Figure 4 From the DSC curve shown, it can be observed that the reverse martensitic transformation temperature of the composition ...

Technical field:

[0001] The invention belongs to the technical field of shape memory alloys, and designs and prepares a novel quaternary shape memory alloy whose composition is Ti-(18-25)Zr-(11-13)Nb-(4.5-6)Ta and has a low phase transition temperature, and utilizes The novel alloy prepares human body medical saddle nail products. Background technique

[0002] Due to its unique shape memory effect, shape memory alloys have been widely used in the fields of aerospace, biomedicine, and civil life. Especially in recent years, with the rapid development of human medical orthopedic implants, shape memory alloys have Due to its functional characteristics and mechanical properties, it has developed rapidly in the application of vascular stents and orthopedic implants. As a unique functional characteristic of shape memory alloys, the shape memory effect is caused by the reversible transformation between the low-temperature martensitic phase and the high-temperature parent phase. Th...

Examples

Embodiment 1

[0036] Example 1: Preparation of low phase transition temperature Ti-19Zr-11Nb-4.5Ta composition shape memory alloy material

[0037] The first step: use titanium block (purity ≥99.99%), zirconium block (purity ≥99.99%), niobium sheet (purity ≥99.98%) and tantalum block (purity ≥99.98%) for vacuum consumable arc melting, for Ensure the homogeneity of the composition and smelt more than 5 times to prepare alloy ingots of 1-5 kg ​​level.

[0038] Step 2: Homogenize the ingot in a vacuum heat treatment furnace at 1000°C for more than 6-10 hours to further eliminate component segregation.

[0039] Step 3: Carry out billet forging treatment on the alloy ingot, the billet temperature is 1000-1100°C, the annealing temperature is 850-1000°C, after 3-5 passes of forging, the size is about 30mm×50mm×80mm. material.

[0040] Step 4: Cut the ingot into thin slices with a thickness of 4-6mm along the cross-section of the block by means of wire-cutting mechanical treatment, and perform co...

Embodiment 2

[0048] Embodiment 2: Preparation of Ti-18Zr-13Nb-6Ta composition shape memory alloy material with low phase transition temperature;

[0049] According to the preparation method described in Example 1, a martensitic Ti-18Zr-13Nb-6Ta composition alloy plate was obtained.

[0050] Cut a sheet sample with a size of 5mm×50mm×0.5mm and pass figure 1 The bending method shown performs the shape memory effect measurement. The maximum shape memory effect of the Ti-18Zr-13Nb-6Ta composition alloy is 3.8%, which is equivalent to that of the existing Ti-Zr-based alloys, indicating that the composition alloy has excellent shape memory performance.

[0051] A sample with a size of 1 mm × 1 mm × 0.5 mm was cut from the alloy plate by slow wire cutting, and the phase transition temperature was measured by a NETZSCHSTA449 differential scanning calorimeter. use image 3 From the DSC curve shown, it can be observed that the reverse martensitic transformation temperature of the composition allo...

Embodiment 3

[0053] Example 3: Preparation of Ti-23Zr-12Nb-4.5Ta composition shape memory alloy material with low phase transition temperature;

[0054] According to the preparation method described in Example 1, a martensitic Ti-23Zr-12Nb-4.5Ta composition alloy plate was obtained.

[0055] Cut a sheet sample with a size of 5mm×50mm×0.5mm and pass figure 1 The bending method shown performs the shape memory effect measurement. The maximum shape memory effect of the Ti-23Zr-12Nb-4.5Ta composition alloy is 3.5%, which is equivalent to that of the existing Ti-Zr-based alloys, indicating that the composition alloy has excellent shape memory performance.

[0056] A sample with a size of 1 mm × 1 mm × 0.5 mm was cut from the alloy plate by slow wire cutting, and the phase transition temperature was measured by a NETZSCHSTA449 differential scanning calorimeter. use Figure 4 From the DSC curve shown, it can be observed that the reverse martensitic transformation temperature of the composition ...

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