A kind of multilevel three-dimensional multiphase layered zirconium alloy and its preparation method

Abstract

The invention discloses a multilevel three-dimensional multiphase layered zirconium alloy and a preparation method thereof. The zirconium alloy comprises a zirconium alloy body, wherein the zirconiumalloy body contains an isometric coarse crystal, a multi-phase structure is contained in the isometric coarse crystal, and the phase in the multi-phase structure comprises an Alpha phase, an Alpha' phase, a Beta phase and an Omega phase, each phase in the multi-phase structure is of a lamellar structure and is distributed in parallel with one another, the thickness of a single-phase in the lamellar structure is 1nm - 10000nm, and the distribution direction of the lamellar structure in different regions in the isometric coarse crystal is different. The zirconium alloy has excellent comprehensive mechanical properties, thermal stability and excellent radiation resistance, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a multilevel three-dimensional multiphase layered zirconium alloy and a preparation method thereof. Background technique [0002] Zirconium alloys are widely used in cladding materials of nuclear power water-cooled reactors and structural elements of nuclear reactor cores because of their low neutron scattering cross section, excellent corrosion resistance and good comprehensive mechanical properties. However, as increasing nuclear fuel burnup, reducing nuclear fuel cycle costs, improving nuclear reactor thermal efficiency and safety and reliability have become the development direction of next-generation nuclear reactors, people are more concerned about the mechanical properties, high temperature stability, creep resistance, and anti-corrosion properties of zirconium alloys for nuclear applications. Radiation performance and corrosion resistance put forward higher requirements. How...

AI Technical Summary

Problems solved by technology

However, the existing technologies for increasing the interface density of materials often have the following problems, making it difficult to achieve industrial applications

For example, the interfacial spatial orientation of metal materials prepared by physical vapor deposition (PVD) and continuous rolling (ARB) processes is single, making their properties highly anisotropic, which will be detrimental to the safe service of metal structural materials

In addition, the deposition rate of the PVD method is extremely slow, which cannot meet the needs of large-scale production of bulk samples

The ARB method has extremely high requirements on the deformability of the initial material, and in the process of rolling, the interface impurities are difficult to avoid, which makes the plasticity of the material prepared by ARB generally poor; in addition, at high temperature, the high-energy grain boundaries in the material structure may be in the grain Transition of the boundary-phase boundary junction to a low-energy phase boundary, which will jeopardize the safety of the material during service

Moreover, the ARB process steps are cumbersome, which is not conducive to the reduction of production costs

Therefore, existing method is difficult to realize industrialized production and satisfy market demand

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