Zirconium-based bulk amorphous alloy and preparation method thereof

Abstract

The invention provides a zirconium-based bulk amorphous alloy and a preparation method thereof and belongs to the technical field of amorphous alloys. A proper amount of silver element is used for replacing the iron element in the existing amorphous alloy Zr<60>Cu<25>Al<10>Fe<5>, the replacement of the iron element with the silver element causes the component segregation on an atomic scale in an atomic stacking structure in the amorphous alloy, and a large number of high-density short-range ordered structures (such as an icosahedron short program, a distorted icosahedron short program and thelike) are formed, so that the amorphous forming capability and the mechanical property of the system are obviously improved, the viscosity and the stability of an amorphous melt are obviously increased, and the reheating crystallization behavior of the material is greatly inhibited, namely the room-temperature plastic deformation capability, the amorphous forming capability, the thermal stabilityand the mechanical property of the amorphous alloy can be improved by replacing the Fe element with the Ag element.

Description

technical field [0001] The invention relates to the technical field of amorphous alloys, in particular to a zirconium-based bulk amorphous alloy and a preparation method thereof. Background technique [0002] Amorphous alloy, also known as metallic glass, is a new type of alloy material with long-range disorder and short-range order obtained by using various modern rapid solidification metallurgical techniques. Bulk amorphous alloys generally refer to amorphous alloys with a critical diameter or thickness exceeding 1mm. When the metal melt solidifies at an extremely fast cooling rate, its nucleation and growth processes are inhibited, and the disordered microstructure inside the melt is directly "frozen". Therefore, amorphous alloys can also be called liquid metals . Because of this microstructure different from the "long-range order" of crystalline alloys, amorphous alloys are endowed with many excellent physical and chemical properties, such as high strength, high hardne...

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Problems solved by technology

[0003] However, the existing amorphous alloys have the following technical problems: (1) the size of existing amorphous alloys is limited, which limits the application of amorphous alloys in structural materials; Microstructure, there is no plastic deformation mechanism such as dislocation slip, twinning and work hardening during deformation, and severe stress concentration will occur when stress is loaded, and cause shear band softening, which eventually leads to limited room temperature plastic deformation ability; ( 3) Amorphous alloy is a metastable material, which is prone to crystallization behavior when it is used in hot forming or in an environment above the glass transition temperature, and precipitates crystalline phases with complex structures and uneven distribution, which will change the amorphous alloy. properties, which not only further reduce its room temperature plasticity, but also greatly harm its corrosion resistance, soft magnetic properties and other properties.

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