A kind of preparation method of reinforced magnesium alloy base neutron absorbing plate

Abstract

The invention relates to a preparation method of an enhanced magnesium alloy-based neutron absorption plate. The method comprises the following steps: aiming at the actual condition of nuclear radiation protection, with boron carbide powder, boron powder, magnesium powder and aluminum alloy powder as raw materials, adopting a vacuum hot-pressing technique under the assisted action of an electric field, and preparing a magnesium alloy-based neutron absorption plate blank under electric field heating, resistance heating, pressurizing and vacuum conditions, so that B4C particles and B particles are evenly distributed in a matrix; oxidation of the material is effectively prevented by the vacuum environment; the interface bonding intensity is improved by the electric field action; the blank is molded in a hot extrusion manner; the particle distribution uniformity is improved; the plastic deformation property of the material is improved; the extruded blank is subjected to hot rolling to obtain the plate; the internal metallographic structure of the material is relatively dense; the preparation method is advanced in process, and accurate, detailed and accurate in data; the neutron absorption property of the magnesium alloy-based neutron absorption plate reaches 98%; the material density reaches 99%; the material hardness reaches HV0.1=186.7; the particle distribution is uniform; and the enhanced magnesium alloy-based neutron absorption plate is a lightweight and high-strength composite plate with good neutron absorption property.

Description

technical field [0001] The invention relates to a preparation method of an enhanced magnesium alloy-based neutron absorbing plate, which belongs to the technical field of preparation and application of nonferrous metal alloys. Background technique [0002] Magnesium alloy is a non-ferrous light metal alloy with good shock absorption, machinability, and impact resistance. It is widely used in transportation, electronics, medical equipment, and aerospace industries; magnesium alloys are also used in the nuclear industry. In terms of application, the thermal neutron absorption interface of magnesium is small, only 1 / 4 of that of aluminum. Magnesium alloys have good heat resistance, surface heat flow resistance and γ-ray radiation resistance. 2 The compatibility limit temperature can reach 500 °C, and the UK has used magnesium alloys as cladding materials for natural uranium fuel in CO 2 Used in gas-cooled reactors. [0003] In order to improve the structure and functionality ...

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Problems solved by technology

[0004] Magnesium alloy-based neutron-absorbing plates were prepared by vacuum hot-pressing billets, heating extrusion, and heating rolling under the assistance of an electric field, B 4 C and B can be evenly distributed in the magnesium alloy matrix, which can avoid the agglomeration of particles. Under the electric field assisted vacuum hot pressing environment, it can effectively prevent the oxidation of the matrix alloy, purify the surface of the particles, and improve the interface bonding strength; the blank is heated After extrusion, the density of the material can be improved, the internal particles of the material can be rearranged, the particle agglomeration, pores and crack defects inside the material can be reduced, the mechanical properties of the material can be improved, and the edge cracking phenomenon of the neutron absorbing material during the rolling process can be reduced; The system can further reduce the internal defects of the material and obtain neutron-absorbing material plates of different sizes to meet the application in different protection fields of nuclear power. However, there are still many disadvantages in the preparation method, which needs further research

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