Abstract
Dispersion strengthened molybdenum alloys with different nano-size ZrO2 content were prepared by liquid-liquid doping method. The effect of ZrO2 on the microstructure and low cycle fatigue properties of Mo alloys after vacuum annealing was studied, and the relationship between fracture mode, strain amplitude and life was analyzed. The results show that ZrO2 can dreamily refine grains size of Mo alloy. The grain size of Mo-1.2% ZrO2 alloy is reduced to about 3 μm compared with 114 μm of pure Mo. As a result, the yield strength of Mo–ZrO2 alloys was significantly improved. The yield strength of Mo-1.2% ZrO2 alloy is 29.9% higher than that of Mo alloy. The main reason is the dispersion strengthening and dislocation pinning effect of intra-granular ZrO2 on molybdenum alloy. ZrO2 has a remarkable influence on the fatigue properties of Mo alloy. When the content of ZrO2 is 1.2%, and molybdenum alloy has good plastic deformation ability, high fatigue strength coefficient and long fatigue life. The fatigue life of Mo-1.2% ZrO2 alloy is 37.6% higher than that of Mo-2.0% ZrO2 alloy when the strain amplifier is 0.5. The fracture mode of molybdenum alloy is related to the content of ZrO2. The content of ZrO2 increases from 1.2% to 2.0%, and the fatigue fracture mode changes from mixed fracture to inter-granular fracture.
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