Preparation method of alpha+alpha' phase-containing beta-phase Ti2448 biomedical alloy single crystal and single crystal

Abstract

The invention discloses a preparation method of an alpha+alpha' phase-containing beta-phase Ti2448 biomedical alloy single crystal and the single crystal, wherein the preparation method comprises thesteps: S1, pressing prepared alloy powder into material rods by using a hydrostatic pressure method, and sintering the material rods into polycrystalline rods; and S2, fixing the polycrystalline rod to each of the upper end and the lower end of a ultra-high-temperature optical floating zone furnace, and enabling the other ends of the two rods to be close to each other in a heating zone; sealing afurnace, simultaneously rotating the two rods in the same direction or opposite directions, quickly heating to melt two end points, controlling the rotating speed to stably melt, and butting to form astable melting area; and then moving the heating area for crystal growth, powering off and naturally cooling to room temperature after the crystal growth is finished, and taking out the Ti2448 singlecrystal rod. Compared with the prior art, the method has the advantages that the crystal growth process is simple, the repeatability is high, the single crystal grown by using the optical floating zone method is free of macroscopic defects and has the diameter of centimeter level, the strength and plasticity of the Ti2448 biomedical alloy single crystal material are greatly improved, and the lowelastic modulus is maintained.

Description

technical field [0001] The invention relates to the technical field of biomedical alloy materials, in particular to a method for preparing a β-phase Ti2448 biomedical alloy single crystal containing α+α' phase and the single crystal. Background technique [0002] The optical floating zone method is a single crystal growth method that has been developed rapidly in recent years, and its application scope is becoming wider and wider. The optical floating zone method provides a new research method for growing multi-system, high melting point, and difficult-to-synthesize single crystals. and pathways. The optical floating zone method has the advantages of no need for a crucible, no pollution, fast growth rate, and easy control of components. It shows special advantages in the growth of some crystals that are difficult to grow or easy to contaminate. In addition, the optical floating zone method has a wide range of applications. It can be used for various materials such as oxides...

AI Technical Summary

Problems solved by technology

At present, the Ti2448 prepared in the laboratory is mainly β-phase polycrystalline and β+α-phase polycrystalline obtained by traditional casting or sintering methods. A related research group has prepared pure β-phase single crystals, which have no great strength and plasticity. breakthrough, and because the generation of α phase is difficult to control and other reasons, there is no research report on the growth of β-phase Ti2448 single crystal inlaid with α-phase and α′-phase by using an optical floating zone furnace.

However, the strength and plasticity of pure β-phase single crystals prepared in the laboratory are limited due to grain orientation and other reasons. At the same time, the rods required for growth usually require cutting out single crystals as seed crystals first. The steps are cumbersome and difficult to promote on a large scale.

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