Biomedical Ti-Zr-Hf-Nb-Ta series high-entropy alloy and preparing method

Abstract

The invention relates to a biomedical Ti-Zr-Hf-Nb-Ta series high-entropy alloy. The composition general formula of the high-entropy alloy is TiZrHf<c>Nb<d>Ta<e>, wherein a, b, c, d and e are atomic percents, a is larger than or equal to 5 and smaller than or equal to 40, b is larger than or equal to 5 and smaller than or equal to 40, c is larger than or equal to 5 and smaller than or equal to 40, d is larger than or equal to 5 and smaller than or equal to 40, e is larger than or equal to 5 and smaller than or equal to 40, and the sum of a, b, c, d and e is 100. Starting from a TiZr-transition group high-entropy alloy system, a cluster type structure unit model is combined for component design, a low-modulus and high-corrosion-resistance biomedical TiZr-transition group high-entropy alloy with more excellent comprehensive mechanical performance is prepared, and the elasticity modulus of the Ti-Zr-Hf-Nb-Ta series high-entropy alloy is low to 54GPa.

Description

technical field [0001] The invention relates to the technical field of biomedical materials, in particular to a biomedical Ti-Zr-Hf-Nb-Ta high-entropy alloy and a preparation method thereof. Background technique [0002] Due to their excellent mechanical properties, medical metal materials have significant advantages as dental or orthopedic implants and repair materials. With the improvement of human health and economic development, the market demand for medical implant metal materials is increasing . Titanium and titanium alloys have osseointegration and can provide a biocompatible interface. At the same time, they exhibit high specific strength, low elastic modulus, and excellent corrosion resistance. They have become the materials of choice for medical implant products. However, when medical pure titanium and Ti-6Al-4V alloy (α+β type titanium alloy) are used as implant materials for a long time in clinical practice, they still face the "stress shielding" effect caused b...

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Problems solved by technology

[0004] The (Al,Ni)-transition group metal-based high-entropy alloys, Cr-Mn-Fe-Co-Ni-based high-entropy alloys and some refractory high-entropy alloys developed in the prior art all contain Ni element, and Ni is high-entropy alloy. Biotoxic elements, Ni ions entering the body can cause allergic reactions or cause cancer, so high-entropy alloy systems containing Ni are not conducive to being used as implant materials in the biomedical field; in addition, some developed TiZr-transition metal high-entropy alloys The component elements of the system have good biocompatibility and good corrosion resistance, and can form a denser oxide film on the surface of the alloy, thereby hindering the dissolution of metal ions or the influence of corrosion products on the acceptor, and reducing the damage caused by corrosion. However, the gap between its elastic modulus and that of human bone (30GPa) is still large, and it is still not suitable as an implant material for biomedical applications.

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