Preparation method of double-scale crystalline grain Ti-6Al-4V material

Abstract

The invention discloses a preparation method of a double-scale crystalline grain Ti-6Al-4V material. The preparation method adopts a forming way combining a high energy ball milling process with a spark plasma sintering process, and comprises the following steps of: firstly, taking powder in a segmentation manner in the whole high energy ball milling process to obtain powder with different refining degrees, wherein the grain size distribution range of the ultrafine crystal powder is controlled to be between 100nm and 1 mu m, and the grain size distribution range of the nanocrystalline powder is controlled to be between 10nm and 100nm; then, compounding and uniformly mixing one of the powder serving as the raw material and the ultrafine crystal powder with the nanocrystalline powder according to any mass ratio; and finally, optimizing the spark plasma sintering process. By controlling the mixing proportion of the two powder, the proportion of a rough crystal zone and a fine crystal area in a double-scale crystalline grain Ti-6Al-4V material tissue can be accurately controlled, and the defect that the proportion of rough and fine crystals are difficult to be accurately controlled is overcome; and meanwhile, by optimizing the sintering parameters of the spark plasma sintering process, the material has an excellent comprehensive mechanical property.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a method for preparing a double-scale grain Ti-6Al-4V material. Background technique [0002] With the reduction of the cost of titanium alloy preparation, the material is not only used in the traditional aerospace and marine engineering fields, but also in the civil industry fields such as automobiles and construction. At the same time, with the development of science and technology, the requirements for the mechanical properties of titanium alloys are getting higher and higher. The existing titanium alloys can no longer meet the requirements of the rapid development of aerospace, automobile, construction, marine engineering and other industries, and more research and development is needed. High-performance titanium alloy material. Ti-6Al-4V alloy is a representative α+β two-phase titanium alloy. Its consumption accounts for more than 50% of the total output of titanium...

AI Technical Summary

Problems solved by technology

[0005] Although the large plastic deformation method can prepare defect-free dual-scale grain Ti-6Al-4V materials, it also has certain limitations.

Through the large plastic deformation method, it is difficult to control the grain size of the plastically deformed material and the volume percentage of the coarse-grained region in the structure, which makes the repeatability of the structure poor and the mechanical properties of the material unstable.