Interactions in the Co-Ni-Si system at 800 degrees C

The isothermal cross-section through the ternary phase diagram Co-Ni-Si at 800 degrees C was constructed. No ternary phases exist in the system at thi s temperature. The topology of the Co-Ni-Si isotherm is determined by the f ormation of continuous solid solutions between isomorphous Co2Si and Ni2Si intermetallics and cubic CoSi2 and NiSi2 phases and by rather extensive cob alt/nickel exchanges in other binary silicides. The CoSi intermetallic comp ound was found to be a dominant growing phase in the binary Co/Si as well a s ternary Co-Ni/Si couples with the initial end-members containing up to 50 at.% Of Ni. When the Co-Ni solid solution with 30-70 at.% of nickel was us ed, the formation of NiSi2 and NiSi (instead of CoSi2) intermetallics next to the Si-substrate was observed after interaction at 800 degrees C. (C) 20 00 Elsevier Science S.A. All rights reserved.