Study On Tensile And Compressive Deformation Behavior Of Mo-14%Re Alloy At Room Temperature

Mo-Re alloy has broad application prospects in the fields of aviation,aerospace,electronics industry,high temperature and electric light source due to its good mechanical,processing properties,high temperature resistance and corrosion resistance.However,due to the high price of rhenium,its application is limited.Therefore,it is necessary to develop high-performance low rhenium alloys.At the same time,the molybdenum rhenium alloy needs to be annealed after deformation,and the annealing process has an important influence on the microstructure.At present,the influence of microstructure on the deformation behavior of molybdenum-rhenium alloy with low rhenium content during annealing is still unclear.Therefore,it is necessary to study the tensile-compression deformation behavior and microstructure evolution of Mo-14%Re alloy under different conditions,so as to provide theoretical basis and data support for the deformation processing and application of Mo-Re alloy.The main research contents and conclusions are as following:Firstly,the microstructure evolution of rolled Mo-14%Re alloy during annealing at900°C,1100°C and 1300°C was studied,and its influence mechanism on tensile deformation behavior was clarified.The results have shown that the initial recrystallization of the rolled Mo-14%Re alloy tube occurs at 1100°C.After annealing at1100°C,the number of dimples in the tensile fracture is the largest and the size is the largest.The microstructure uniformity of the alloy tube is the best,and the elongation after fracture is up to 33.5%.At the same time,the microstructure evolution of the rolled Mo-14%Re alloy tube at different annealing temperatures was studied in Channel5software.The evolution mechanism from micropore to crack is clarified by the micropore growth and aggregation model.At the same time,the correlation between microstructure and room temperature tensile-compression properties of forged Mo-14%Re alloy after annealing at 900°C,1000°C,1100°C,1200°C,1300°C and 1400°C was investigated.During the tensile process at room temperature,with the increase of annealing temperature,the Schmid factors of Mo matrix phase and Re O₃ phase gradually decrease,and the Schmid factors of the forged alloy after tensile are larger than those after annealing.During the compression process at room temperature,the macro cracks continuously expand with the increase of compression rate,and the micro cracks show a ladder-type propagation path,which usually appears in the 45°direction between the compression axis and the grain boundary lamellar.The grains at the center of the forged and annealed samples are perpendicular to the TD compression direction.As the compression rate increases,the number of small-angle grain boundaries increases,and the mechanism is continuous dynamic recrystallization.The increase rate of true stress decreases continuously with the increase of true strain,and the decrease of the increase rate may be due to the softening effect induced by DRX.The grains at the edge of the sample are horizontally distributed with the TD compression direction,and the compression rate and texture change have certain changes with the grains at the center.The compressive strength increases with the increase of the compression rate.The research results provide guidance for the annealing treatment of wrought Mo-14%Re alloy.