Microstructure, mechanical properties and tribocorrosion characteristics of (Mo1-xCrx)5Si3 alloys
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Abstract
(Mo 1-xCr x) 5Si 3 alloys were prepared by vacuum arc melting technique. The microstructure and mechanical properties of (Mo 1-xCr x) 5Si 3 alloys were characterized using a scanning electron microscope (SEM), X-ray diffraction (XRD) and nano-indentation tests. The tribocorrosion characteristics of the alloys were investigated using a tribocorrosion tester in 3.5 wt% NaCl solution. The results revealed that the thermal expansion anisotropy ((CTE(c)/CTE(a))) of the (Mo 1-xCr x) 5Si 3 alloys decreased from 2.25 to 1.45 with increasing Cr content. The Cr-alloyed (Mo 1-xCr x) 5Si 3 alloys exhibited a high hardness, and their fracture toughness, ratios of H 3/E 2 and H/E were improved. (Mo 1-xCr x) 5Si 3 alloys showed a strong wear-corrosion combined effect, and an opposite trend between friction coefficient and OCP values was observed during the tribocorrosion tests. The tribocorrosion resistances of (Mo 1-xCr x) 5Si 3 alloys were better than that of 0Cr18Ni9 stainless steel due to the formation of Cr 2O 3-MoO 3-SiO x protective films. The (Mo 0.8Cr 0.2) 5Si 3 alloy exhibited the best tribocorrosion characteristics with a low friction coefficient and wear rate. For the 0Cr18Ni9 and Mo 5Si 3 alloy, pure wear ( V w) was dominant, nevertheless, corrosion-induced wear ( V cw) was the main tribocorrosion mechanism of (Mo 0.8Cr 0.2) 5Si 3 alloy.
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