A Composition Design Method for Metastable β Titanium Alloy

Abstract

A method for composition design of metastable β-titanium alloy, based on first-principles calculation, combined with Mo equivalent, d-electron theory, and yield strength check to design the composition of metastable β-titanium alloy. The first principle is to design alloys from the atomic level to obtain macroscopically high-performance materials, but the span from the atomic scale to the macroscale is too large, resulting in a large difference between the simulation or calculation results and the actual situation. Therefore, the present invention also adopts the methods of Mo equivalent, d-electron theory, and yield strength check simultaneously. Among them, the composition check based on Mo equivalent and d electron theory is mainly based on phase stability. This scale plays a link between the atomic scale of the first principle and the macro scale of the yield strength test. This effective scale spanning realizes the effective spanning from the atomic scale to the macroscopic scale, improves the accuracy of the design method, and at the same time realizes the reduction of the research and development cost of new materials and the improvement of research and development efficiency.

Description

Technical field[0001]The invention belongs to the technical field of titanium alloys, and relates to a composition design method of a metastable beta titanium alloy.Background technique[0002]Metastable β-type titanium alloy is a type of alloy that can retain all β phase without martensitic transformation after quenching to room temperature, and can obtain higher tensile strength after heat treatment. At present, most of the high-strength titanium alloys widely used at home and abroad are metastable beta titanium alloys, such as Ti1023, VT22 and their derivative alloys Ti-5553, Ti-55531 have been used in EL-76, Boeing 787, EL-96-300, Airbus A350 and other aircraft landing gear, wing and pylon connecting device and other key bearing parts, reduce weight>30%. Therefore, metastable beta titanium alloy is one of the key development directions of high-strength titanium alloys.[0003]At present, the alloy design methods applied in the field of titanium alloys mainly include trial and err...

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Problems solved by technology

[0006] In order to overcome the problems of high design cost, long cycle time and large difference between the simulated calculation results and the actual situation in the prior art, the present invention proposes a composition design method for metastable β-titanium alloys

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