Microstructure and Tribological Properties of Mo–40Ni–13Si Multiphase Intermetallic Alloy
Intermetallic compounds are increasingly being expected to be utilized in tribological environments, but to date their implementation is hindered by insufficient ductility at low and medium temperatures. This paper presents a novel multiphase intermetallic alloy with the chemical composition of Mo–40Ni–13Si (at %). Microstructure characterization reveals that a certain amount of ductile Mo phases formed during the solidification process of a ternary Mo–Ni–Si molten alloy, which is beneficial to the improvement of ductility of intermetallic alloys. Tribological properties of the designed alloy—including wear resistance, friction coefficient, and metallic tribological compatibility—were evaluated under dry sliding wear test conditions at room temperature. Results suggest that the multiphase alloy possesses an excellent tribological property, which is attributed to unique microstructural features and thereby a good combination in hardness and ductility. The corresponding wear mechanism is explained by observing the worn surface, subsurface, and wear debris of the alloy, which was found to be soft abrasive wear.
Effects of Mo and B Additives on Hardness and the Resistance of Cu–Ni Alloy to Wear, Corrosion and Corrosive Wear
Due to its corrosion resistance, modifiable mechanical properties, and electrical conductivity, etc., CuNi alloy has found a wide variety of industrial applications, especially in the marine environment. It is highly desired if the mechanical strength and wear resistance of CuNi alloy can reach a level comparable to that of steel while keeps its corrosion resistance. In this study, effects of Mo, B, and their combinations on microstructure and performance of CuNi alloy were investigated, including formation of second phases, hardness, and resistances to wear, corrosion and corrosive wear. It was demonstrated that the Mo and B additives were effective in strengthening the CuNi alloy while maintaining reasonable corrosion resistance. In particular, the combination of Mo and B additives was more effective than a single additive to strengthen the alloy. Mo and B additives have demonstrated their great promise as new alloying elements to modify CuNi alloys.
Garnitures mécaniques d'étanchéité
Keywords: etancheite ; mecanique Reference Record created on 2005-11-18, modified on 2016-08-08