A zirconium-based metallic glass endogenous composite material and its microstructure refinement method

Abstract

The invention discloses a zirconium-based metallic glass endogenous composite material and a method for refining its structure. The atomic percentage expression of the composition of the zirconium-based metal composite material of the present invention is: (Zr a Ti b Cu c Ni d be e Nb f ) Sn g , where 35≤a≤70, 5≤b≤15, 5≤c≤20, 2≤d≤12, 5≤e≤23, 5≤f≤15, 0.5≤g≤2, a+b+c+ d+e+f+g=100. According to the principle of heterogeneous nucleation of precipitated phases, the present invention first calculates the mixing heat of Sn element and BMG alloy element, and finds that Zr-Ti-Cu-Ni-Be-Nb alloy system adds Sn element, and only Zr is formed in the alloy 5 sn 3 nanoparticles, and Zr 5 sn 3 Melting point 1988°C, β‑Zr(Ti) melting point 1856°C, Zr 5 sn 3 Precipitate before β‑Zr(Ti), and then calculate Zr 5 sn 3 and Zr 5 sn 3 The degree of mismatch found that Zr 5 sn 3 It can be used as an effective heterogeneous nucleation core for the β-Zr phase, so that the β-Zr(Ti) phase that precipitates first during the solidification of the alloy is replaced by Zr 5 sn 3 Precipitate and grow as the core; add Sn element on the basis of ensuring the formation ability of the bulk metallic glass to form the heterogeneous nucleation core of the β-Zr phase, and refine the morphology of the first precipitated phase through heterogeneous nucleation to obtain a fine and uniform organizational structure.

Description

technical field [0001] The invention belongs to metal-based composite material technology, in particular to a zirconium-based metallic glass endogenous composite material and a method for refining its structure. Background technique [0002] Although bulk metallic glass (BMG) materials have high fracture strength and hardness and high elastic strain limit, since the plastic deformation of single-phase metallic glass is achieved by highly localized shear deformation, the shear that can be activated before fracture With a very limited number of bands, the BMG undergoes catastrophic brittle fracture without macroscopic plastic deformation at room temperature. Therefore, the problem of room temperature brittleness has developed into an important bottleneck for the application of BMG materials. [0003] In order to improve the room temperature brittleness of BMG materials, in 2000, the Johnson research group in the United States first prepared micron-sized β-Zr(Ti) solid solutio...

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Problems solved by technology

[0004] Although the as-cast endogenous solid solution plasticized BMG composite adopts the method of increasing the solidification cooling rate to obtain a uniform and fine second phase structure, this method is easily limited by equipment conditions, and the cooling conditions often cannot meet the requirements for obtaining an ideal structure.

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