Abstract
The refinement of grain size and introduction of the second phase particles are the main pathways to improve the mechanical properties of Mo materials. In this work, ultrafine-grained Mo alloy with in-situ formed intragranular MoO2 particles (average particle size, 34 nm) was prepared via spark plasma sintering (SPS) of Mo nanopowder. This ultrafine-grained Mo sample possessed excellent hardness and bending strength of 464 HV1.0 and 909 MPa, respectively, which were more than twice of the traditional coarse grained Mo alloy. It was found that these intragranular MoO2 nanoparticles were converted from the oxygen on the surface of Mo nanoparticles and had a coherent relationship with Mo matrix (MoO2 (110) // Mo (102)), which can improve strength via inhibiting grain growth, pinning and storing dislocations.
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