Effect of Layered Ti₃AlC₂Ceramic Phase on Mechanical Properties of Molybdenum-Rhenium Alloy AITranslate

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Chinese Library Classification Number:TG113.25[金属学及工艺—物理冶金]

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Molybdenum-rhenium alloy is regarded as an ideal core material for nuclear reactors due to its good compatibility with common nuclear fuels under high temperature conditions.However,the lack of high-temperature strength and room temperature toughness limits its application in extremely harsh environment.In this study,the strategy of layered Ti₃AlC₂ceramic phase strengthening molybdenum-rhenium alloy was put forward.Mo-5%Re and Mo-5%Re-1%Ti₃AlC₂alloys were prepared by powder metallurgy method.The effects of layered Ti₃AlC₂ceramic phase doping on the molybdenum-rhenium powder morphology and 1100~1400℃ hot compression properties and room-temperature mechanical properties of molybdenum-rhenium alloy were investigated.The results show that the Mo-5%Re-1%Ti₃AlC₂alloy exhibits an everage grain size of 21.6μm,with Ti₃AlC₂particles distrubuted both at grain boundaries and within the grains.During hot compression at 1100℃,the peak stress of the alloy reaches 285.7 MPa,which is 17.6% higher than that of Mo-5%Re alloy.After rolling and annealing at 1200℃,the tensile strength of the alloy at room temperature reaches 609 MPa,and the elongation after fracture reaches 22.5%,which increase by 19.88% and 85.95% compared with Mo-5%Re alloy,respectively.The introduction of layered Ti₃AlC₂ceramic phase can hinder dislocation movement to increase the dislocation density in molybdenum-rhenium alloy,hinder the grain boundary migration and inhibit dynamic recrystallization,thus improving the dynamic recrystallization temperature and high-temperature strength of molybdenumrhenium alloy.The unique layered structure of Ti₃AlC₂can reduce the local stress field of the crack tip through crack deflection and bridging,and improve the mechanical properties of molybdenum-rhenium alloy at room temperature.