Si-containing high-strength low-modulus Beta-type titanium alloy and preparation method and application thereof

A titanium alloy, low-mold technology, used in prosthesis, tissue regeneration, medical science, etc., can solve the problems of weakened performance, poor plasticity, high brittleness of hypereutectoid steel, and achieve the effect of improving strength and plasticity

Active Publication Date: 2017-08-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of non-metallic elements, such as Si, is easy to generate a Si-containing grain boundary weakening phase. From the perspective of the relationship between the microstructure and macroscopic properties of the material and the control mechanism, the brittleness of the continuous thin layer of the grain boundary usually plays a role in the performance of the material. to the weakening effect
For example, when the cooling rate of hypereutectoid steel is slow, it first transforms into single-phase austenite, and the proeutectoid cementite precipitated in the subsequent cooling process forms a continuous network along the austenite grain boundary. shape distribution, the hypereutectoid steel with this structure has high brittleness and poor plasticity

Method used

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  • Si-containing high-strength low-modulus Beta-type titanium alloy and preparation method and application thereof
  • Si-containing high-strength low-modulus Beta-type titanium alloy and preparation method and application thereof
  • Si-containing high-strength low-modulus Beta-type titanium alloy and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Alloy composition design: design titanium alloy composition as Ti 60at.%, Nb 20at.%, Zr10at.%, Ta5at.%, Si5at.%. The alloy is prepared from sponge titanium, sponge zirconium, tantalum-niobium master alloy and silicon.

[0034] (2) Casting: The casting process is vacuum consumable arc melting. The prepared raw materials are pressed into electrodes, and the size of the electrodes is controlled to be 50-70mm smaller than the crucible; the gap between the electrodes and the molten pool is controlled between 60-80mm; the melting speed is 20kg / min; ingot.

[0035] (3) Plastic deformation at high temperature: the ingot obtained by casting is cut into a cuboid sample of 15×25×80 mm. Choose Ti-6Al-4V as the sheath material, assemble the sheath with the sample, heat to 900°C, and keep it warm for 30min. Multi-pass hot rolling. Finally, a sample with a rolling ratio of 80% was obtained and water quenched to room temperature.

[0036](4) Recovery and recrystallization: rem...

Embodiment 2

[0042] (1) Alloy composition: design titanium alloy composition as Ti 70at.%, Nb 10at.%, Zr10at.%, Ta6at.%, Si 4at.%. The above-mentioned components of the alloy are prepared with sponge titanium, sponge zirconium, tantalum-niobium master alloy and silicon as raw materials.

[0043] (2) Casting: The casting process is vacuum consumable arc (VAR) melting. The prepared raw materials are pressed into electrodes, and the electrode size is controlled to be 50-70mm smaller than the crucible; the gap between the electrode and the molten pool is controlled to be between 60-80mm; the melting speed is 20kg / min. Remelt twice to get ingots. The dendritic β-titanium matrix with the as-cast microstructure of 50-300 μm is dispersed with spherical S2 phases with a size of about 1-3 μm and acicular S2 phases with a length of about 50-100 μm, and the grain boundaries are continuous. S2 phase.

[0044] (3) Plastic deformation at high temperature: Cut the ingot obtained by casting into a cube ...

Embodiment 3

[0048] (1) Alloy composition: design titanium alloy composition as Ti 65at.%, Nb 15at.%, Zr10at.%, Ta7at.%, Si 3at.%. The above-mentioned components of the alloy are prepared with sponge titanium, sponge zirconium, tantalum-niobium master alloy and silicon as raw materials.

[0049] (2) Casting: The casting process is vacuum consumable arc (VAR) melting. The prepared raw materials are pressed into electrodes, and the electrode size is controlled to be 50-70mm smaller than the crucible; the gap between the electrode and the molten pool is controlled to be between 60-80mm; the melting speed is 20kg / min. Remelt twice to get ingots. Spherical S2 phases with a size of about 1-3 μm and acicular S2 phases with a length of about 50-100 μm are dispersed on the dendritic β-titanium matrix with a microstructure of 50-300 μm in the as-cast state, and the grain boundaries are continuous. S2 phase.

[0050] (3) Plastic deformation at high temperature: the ingot obtained by casting is cut...

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Abstract

The invention belongs to the field of titanium alloy materials, and discloses Si-containing high-strength low-modulus Beta-type titanium alloy and a preparation method and application thereof. The preparation method includes the steps that according to the atomic percent of 60%-70% of Ti, 10%-20% of Nb, 5%-15% of Zr, 1%-10% of Ta and 1%-5% of Si, sponge titanium, sponge zirconium, tantalum-niobium intermediate alloy and silicon are used as raw materials to prepare alloy compositions, then the alloy compositions are evenly smelted to obtain a solidified ingot casting, afterwards, the obtained ingot casting is subjected to high-temperature plastic deformation, the deformation temperature is 800-900 DEG C, the deformation amount is 60%-80%, and water quenching is performed to an indoor temperature; and finally an obtained sample is heated to a recrystallization temperature, heat preservation lasts for 1-4h, air cooling is conducted to an indoor temperature after annealing treatment is completed, and accordingly the Si-containing high-strength low-modulus Beta-type titanium alloy can be obtained. The titanium alloy obtained through the method has the higher strength, larger plasticity, lower elasticity modulus and finer grain sizes, thereby being more suitable for medical implant materials.

Description

technical field [0001] The invention belongs to the field of titanium alloy materials, and in particular relates to a Si-containing high-strength low-modulus β-type titanium alloy and a preparation method and application thereof. Background technique [0002] Titanium alloy has the characteristics of good biocompatibility, excellent comprehensive mechanical properties, and good corrosion resistance, and has become the mainstream material for the development of medical products in the international community. The development of titanium and its alloys can be divided into three eras: the first era is represented by pure titanium and Ti-6Al-4V, which have high strength and good processing performance. The second era is a new type of α+β titanium alloy represented by Ti-5Al-2.5Fe and Ti-6Al-7Nb, which has a more controllable structure and greatly improved performance; Novel β-type titanium alloys have been studied most extensively. These new β-type titanium alloys generally co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00C22C1/03C22F1/18A61L27/50A61L27/06
CPCA61L27/06A61L27/50C22C1/03C22C14/00C22C30/00C22F1/183A61L2430/02C22C1/02C22F1/002C22C1/0458
Inventor 李元元叶伟文杨超王芬张卫文肖志瑜
Owner SOUTH CHINA UNIV OF TECH
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