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800°C isothermal section of the Co–Cr–Mo–Si quaternary system

Abstract The 800°C isothermal section of the Co–Cr–Mo–Si quaternary system with the Co content fixed at 70 at.% and different contents of Cr, Mo and Si was determined by means of X-ray diffraction and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. Twelve different phase regions could be identified; one of them being a wide (Co) + Co3Mo2Si phase field, but only one four-phase region consisting of (Co) + Co3Mo +Co7Mo6 + Co3Mo2Si was experimentally confirmed. The measured solubility of Si in the Co3Mo phase is rather limited but could reach up to 15.1 at.% in Co7Mo6. The solubility of Cr in Co3Mo and Co7Mo6 was measured to be as high as 13.4 and 23.3 at.%, respectively, and the maximum solubility of Cr in (Co), αCo2Si and Co3Mo2Si could reach 26.9, 5.6 and 12.5 at.%, respectively.