High-temperature-resistant radiation-resistant high-entropy alloy and preparation method thereof

Abstract

The invention provides a high-temperature-resistant anti-radiation high-entropy alloy and a preparation method thereof, and belongs to the field of anti-radiation metal materials. The high-temperature-resistant radiation-resistant high-entropy alloy prepared by the additive manufacturing method comprises the following components: Ni, Cr, Fe, V and Ti. The high-entropy alloy is composed of a NiCrFeVTi solid solution phase of a face-centered cubic structure and a Ni3Ti phase of a face-centered cubic structure, wherein the NiCrFeVTi solid solution phase is distributed in a dot matrix shape. The NiCrFeVTi solid solution phase of the face-centered cubic structure has the characteristic of high solid solution degree, lattice distortion is large, dislocation motion in a matrix and helium bubble migration and growth are well restrained, and excellent high-temperature mechanical strength and radiation resistance are achieved. Meanwhile, the Ni3Ti phase distributed in the matrix in a dot matrix shape can further inhibit dislocation motion and helium bubble migration and growth under the high-temperature condition, and the influence of a semi-coherent interface of the Ni3Ti phase and the matrix on plasticity is small. The high-entropy alloy has good high-temperature mechanical properties and radiation resistance at the same time.

Description

technical field [0001] The invention relates to the technical field of radiation-resistant metal materials, in particular to a high-temperature-resistant and radiation-resistant high-entropy alloy and a preparation method thereof. Background technique [0002] Radiation-resistant metal structural materials are key materials used in advanced nuclear reactors. Its development requirement is to have excellent high-temperature mechanical properties and radiation resistance (mainly anti-helium embrittlement and swelling properties) under the service conditions (design operating temperature) of 850 °C and above. At present, the main radiation-resistant metal structural materials are low-activity stainless steel and nickel-based superalloys. However, the insufficient high-temperature mechanical properties of stainless steel and the poor radiation resistance of nickel-based superalloys directly affect the safety redundancy and service life of advanced nuclear reactors, and greatly ...

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Problems solved by technology

However, its tensile yield strength at room temperature is only 368.5MPa, its tensile breaking strength is only 695.2MPa, and its high temperature mechanical properties and radiation resistance have not been reported yet.

This is mainly because the addition of trace carbon in the smelting process forms carbide precipitates in the high-entropy alloy matrix, but its precipitation during the smelting process is random, and the size and distribution of carbides cannot be controlled, resulting in excessive carbide size. Large, the distribution is too loose or concentrated, which cannot effectively improve the radiation resistance of the material

In addition, the interface between the carbide and the matrix is ​​in a non-coherent interface relationship, and the wettability of the interface is insufficient. During the stretching process (especially under high temperature conditions), microcracks are easily formed at the interface, resulting in a significant decrease in the strength and plasticity of the material, resulting in High-temperature mechanical properties of high-entropy alloys do not increase but decrease

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