Abstract
Three kinds of molybdenum alloy are doped with 2.0 wt.% different ultrafine oxide particles (Al2O3, ZrO2 and La2O3) via hydrothermal synthesis, co-precipitation, co-decomposition, powder metallurgy, and rotary swaging. Three nano-oxides refine molybdenum grains by more than 70% and change the fracture modes from brittle fracture to ductile fracture, thereby dramatically improving the integrated mechanical properties of the alloys. Moreover, the trade-off between strength and ductility is offset. Mo−ZrO2 alloy has the highest strength and plasticity, which is attributed to fine ZrO2 particles and a semi-coherent interface between ZrO2 and molybdenum matrix. Moreover, a quantitative strengthening model correlating dislocation density, oxide volume fraction and size, and molybdenum grain size is established.
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