钼铼合金组织与性能调控研究进展OA

To clarify the role of rhenium in the microstructure and properties of molybdenum-based alloys,this paper systematically compared three doping processes:solid-solid,solid-liquid,and liquid-liquid,and analyzed the effects of different rhenium(Re)con-tents on the mechanical properties,microstructure,and behavior in a nuclear environment of the alloys.According to the research,the strength of the alloy exhibits a significant improvement as the Re content increases.The room-temperature tensile strength of Mo-51Re reaches1 252 MPa,The elongation of Mo-Re alloys with a rhenium content of 10%～41%(mass fraction)reaches35%～45%.The hardness of low-rhenium alloys(2%～15%Re,mass fraction)is about164HV,while that of high-rhenium alloys(30～50%Re,mass fraction)can exceed 300HV.The addition of rhenium promotes a transition in the dominant dislocation type from edge to mixed.The grain size refines with increasing rhenium content,with the average grain size of Mo-42 Re being 20～25 μm.When the rhenium content exceeds 40%(mass fraction),twins increase significantly.Under neutron irradiation at 450～800℃,low-rhenium alloys(2%～15%Re,mass fraction)exhibit superior irradiation adaptability.This paper provides a basis for the composition design and process selection of Mo-Re alloys under extreme service conditions.