Abstract
Four Mo-Si-B alloys were manufactured using a non-consumable arc melting method. The structure, wear behavior, and tribocorrosion performances in 3.5 wt% NaCl solution for the alloys was thoroughly evaluated. The alloys possess favorable overall mechanical characteristics, including high hardness (15–19.5 GPa), elastic modulus (337–364 GPa), and fracture toughness (9.32–11.1 MPam1/2), and their wear resistance remarkably improved as the Mo content increased. The alloys are subjected to worn mechanisms of adhesive, plastic deformation, brittle spalling and tribo-oxidation. The alloys exhibit superior tribocorrosion characteristics due to the formation of a MoO3-MoO2-SiO2-B2O3 protective film with good corrosion resistance and lubricating properties. In tribocorrosion tests, tribocorrosion losses of the alloys were dominated by the wear behavior (Vw+Vcw), and the corresponding tribocorrosion mechanism was discussed.
Published Version
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