Abstract
The effect of Mo on the microstructure and mechanical properties of Nb–Ti–C–B multiphase alloy was investigated. The alloy without Mo contains the primary Nb solid solution (Nbss) dendrites and interdendritic eutectic network containing Nbss, (Nb,Ti)C and (Nb,Ti)B. In Mo-added alloys, the solubility of Mo is found in Nbss and (Nb,Ti)B. Mo addition refines the primary Nbss dendrites and promotes the coarsening of boride phase, but does not obviously change the volume fraction of primary Nbss and total secondary particles. The hardness, compression properties and fracture toughness were evaluated to determine the strengthening and toughening effect of Mo-added alloys at room temperature. The results indicate that the hardness and compressive yield strength increase with increasing Mo content, but Mo addition decreases the room temperature fracture toughness.
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