Effect of ZrO2 on Microstructure and Properties of Molybdenum-Rhenium Alloy
Molybdenum-rhenium alloy has excellent mechanical and machining properties,and is a key structural material in fields such as electronics and nuclear industry.Adding zirconia to molybdenum rhenium alloy forms dispersion strengthening effect;when the effect is combined with deformation strengthening,the mechanical properties of the material can be improved.The particle size of the alloy powder decreases with the increase in ZrO2 content,with the smallest and most uniform grain size at a content of 0.7wt％.ZrO2 particles exhibit a pinning effect during the deformation and fracture process of the alloy,significantly improving its mechanical properties such as tensile strength,yield strength,and elongation.The tensile strength and elongation of ZrO2 strengthened molybdenum-rhenium alloy reach the highest value when the ZrO2 content is 0.7％,and then decrease;ZrO2 is basically dispersed at grain boundaries and forms a good bonding interface with the molybdenum matrix,which can inhibit the migration of grain boundaries and improve the deformation resistance of molybdenum alloys.
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