Enhanced mechanical properties of molybdenum alloy originating from composite strengthening of Re and CeO2
To enhance the mechanical properties of molybdenum alloys at both room and high temperatures,Mo-14Re-1CeO2 alloy was synthesized using the powder metallurgy method,and the corresponding microstructure and mechanical properties were characterized.The results indicate that the ultimate tensile strength of Mo-14Re-1CeO2 reaches 657 MPa,with a total elongation of 35.2％,significantly higher than those of pure molybdenum(453 MPa,and 7.01％).Furthermore,the compression strength of Mo-14Re-1CeO2 at high temperature(1200 ℃)achieves 355 MPa,which is still larger than that of pure molybdenum(221 MPa).It is revealed that there is a coherent interface between CeO2 and the Mo-14Re matrix with CeO2 particles uniformly distributed in both intergranular and intragranular regions.The improvements in mechanical properties are primarily attributed to the formation of Mo-Re solid solution,grain refinement,and dispersion strengthening effect of CeO2.
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