CoCr binary system: experimental re-determination of the phase diagram and comparison with the diagram calculated from the thermodynamic data

Cr-rich layer at the WC/Co interface in Cr-doped WC–Co cermets: segregation or metastable carbide?

“…So the crystal structure of the layer likely corresponds to the metastable phase (Cr,W)C. The measured lattice parameter (0.41 nm) smaller than that of WC 1Àx (0.422-0.433 nm) indicates a significant Cr content that is consistent with the measured composition. The occurrence of such a metastable Cr-rich carbide is also consistent with the thermodynamic data of the constitutive systems [22,23,26,27] that show strong chemical interactions in the system Cr-C. The Cr carbides are very stable and precipitates of Cr based M 7 C 3 are observed in WC-Co alloys doped with a high Cr level [13].…”

“…In the quaternary system W-Co-C-Cr, several stable phases are formed between Cr and the other constitutive elements (W, Co, C): bcc solid solution (Cr,W) [21,22], bcc solid solution (Cr,Co) and s phase Co, Cr [23], Cr carbides Cr 3 C 2 , Cr 7 C 3 , Cr 23 C 6 [21] and Z phase (Co,W,Cr) 6 C [12]. None of these phases has a crystal structure corresponding to the layer phase.…”

Experimental determination and thermodynamic calculation of the phase equilibria in the Cu–Cr–Nb and Cu–Cr–Co systems

“…Several thermodynamic assessments of the Cu-Co [17][18][19][20][21], Cu-Cr [22][23][24][25][26], Cu-Nb [22], Co-Cr [27][28][29][30][31][32][33], and Cr-Nb [34,35] binary systems have been carried out by using the CALPHAD method. The optimized parameters of the Cu-Co [17], Cu-Cr [22], Cu-Nb [22], Co-Cr [27], and Cr-Nb [35] systems were used in the present work by considering the consistency of the thermodynamic database for the Cu-based alloys developed by our group [36][37][38].…”

6: Critical evaluation of constitution of cobalt–chromium–iron and cobalt–iron–nickel systems

“…When oFe and aFe are continuous with one another (as for Cr-Fe) the bcc solid solution is referred to as aoFe. Allibert et al 15 have undertaken a comprehensive investigation of the whole system, using a combination of techniques. Their diagram differs from that recommended by Hansen and Anderko…”

“…In some cases (Figs. 11,(15)(16)(17) the Dr V. G. Rivlin is in the Department of Physical Metallurgy and Science of Materials, University of Birmingham. boundary locations proposed in original papers infringe thermodynamic criteria of equilibria: it has been deemed best to reproduce these data without modification.…”