Effect of Different Solid-Solid Doping Processes on the Properties of Zirconia Diffusion Strengthened Molybdenum Alloys
Zirconia dispersion strengthened molybdenum alloys were prepared by solid-solid doping in molybdenum dioxide and molybdenum powder,using zirconia as the additive by powder metallurgy.The differences in metallo-graphic organization and microstructure of the alloys were analyzed and compared,and the tensile strength,hard-ness and recrystallization temperature of the molybdenum-zirconium alloys prepared by different doping processes were tested.It is shown that the molybdenum-zirconium alloys prepared by different solid-solid doping processes have certain differences in mechanical properties,processability and recrystallization temperature.The molybdenum-zirconium alloy prepared by doping zirconia in molybdenum dioxide has higher hardness and tensile strength and more obvious work-hardening phenomenon after a certain degree of plasticity processing,and the recrystallization temperature of the processed ϕ0.68 mm wire is about 1 400℃ ,which is 200℃ higher than that of the molybde-num-zirconium alloy prepared by adding zirconia in molybdenum powder under the same conditions,it possesses better high-temperature mechanical properties.
solid-solid dopingmolybdenum-zirconium alloyszirconiamechanical propertiesrecrystallization temperature
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