a lightweight ti 35 the y 35 sc 20 v 5 al 5 High entropy alloy and its preparation method

Abstract

The invention discloses a light Ti35Y35Sc20V5Al5 high-entropy alloy and a preparation method thereof, and belongs to the technical field of light high-entropy alloy material. A vacuum arc is used forsmelting. An INSTRON mechanical experiment machine and a Hopkinson pressure bar are used for respectively conducting a quasi-static compression test with strain rate of 1*10<-3>s<-1> and a dynamic compression test with strain rate of 1500 s<-1>. The crystal structure is analyzed by X-ray diffraction. Composition and distribution of a phase are determined by energy spectrum analysis. A scanning electron microscopy is used for observing the microstructure of a specimen at the fracture surface, and the fracture model is the brittle fracture mode. The high-entropy alloy is a high-entropy solid solution phase with dense hexagonal structure. Under the condition of high strain rate, the yield strength and plasticity of the material are improved. The material exhibits excellent impact toughness.

Description

technical field [0001] The invention belongs to the technical field of lightweight high-entropy alloy materials, in particular to a lightweight Ti 35 Y 35 sc 20 V 5 Al 5 High-entropy alloys and methods for their preparation. Background technique [0002] Exploring new materials is one of the eternal goals of human beings. The traditional main method to explore new materials is to obtain new materials by changing and modulating chemical composition, modulating structure, phase and changing structural defects. In the past ten years, people have discovered that new materials can also be obtained by modulating the "order" or "entropy" of materials. In 2004, Professor Ye Junwei, a Chinese scholar, and Professor Cantor, a British scholar, took the lead in proposing the brand-new alloy development concept of "high-entropy alloy", that is, no longer using one element as the main element, but consisting of 5 to 13 components, usually The design is an equimolar ratio, each comp...

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Problems solved by technology

High-entropy alloys mainly diffuse through the vacancy mechanism. Because the melting point of different atoms is different from the bonding strength, atoms with stronger mobility are more likely to diffuse to the vacant position, but the bonding between elements is different. Generally speaking, , atomic diffusion is the process of continuously filling the vacancies. If the energy decreases after filling the vacancies, it is difficult for the atoms to continue to diffuse.

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