Computer-aided thermodynamics of liquid ternary Fe–Ni–Co alloys by Knudsen cell mass spectrometry

Activity of Components in Liquid Alloys of the Iron-Cobalt-Nickel System

“…Recently, Tomiska studied, using a method modified by him, which employed a Knudsen cell and a mass-spectrometer, the thermodynamic properties of Isoactivity lines of (a) iron, (b) cobalt, and (c) nickel in liquid alloys in the Fe3Co3Ni system, plotted using experimental (left-hand, 1577oC, data from [18]) and calculated (right-hand, 1600oC) data.…”

“…The activity coefficients of the boundary binary systems, taken for the calculation, a listed in Table 1. Activity coefficients of the components in the boundary binary systems at 1600oC, * taken for calculation ÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄ * Experimentally determined, from the data obtained by Tomiska [18] (1577oC), activities of one of the components are given for the x i : x j = 1 : 1 sections. For other sections, no numeric data were presented in the original paper.…”

Transformations in CoCrCuFeNi MPEA thin films during in-situ annealing in TEM

“…A possible phase, present in the annealed up to 700°C films, is the sigma phase [129,130]. It is known that Cr is a strong sigma phase former below 700 °C, which can be deduced from the binary alloy phase diagrams of Cr-Co, Cr-Fe, or from Cr-Co-Fe ternary phase diagram [113][114][115][116][117][118][119][120][121][122]. The crystal structure of the sigma phase [130] belongs to the tetragonal space group with lattice parameters of a=8.8 Å and c=4.5 Å.…”

“…We should note that when the specimen was heated up to 998 K, the peaks corresponding to B2 ordering disappeared while a new peak (X) was observed. The chemical composition of these phases was identified based on phase diagram database of ordering and compound formation with temperature from all possible binary alloy systems present in CoCrCuFeNi MPEA thin films [113][114][115][116][117][118][119][120][121][122]. The formation of intermetallic compounds like σ phase, ordered BCC-based B2 phase and FCC-based L1 0 or L1 2 phases are summarized in table 1 and suggest that formation of B2 structure could only appear in the Fe-Co alloy system among the combinations of Co, Cr, Cu, Fe, and Ni.…”

“…At the formation of intermetallic compounds σ phase, BCC-based B2 phase and both FCC-based L1 0 and L1 2 phases, formed from Co, Cr, Cu, Fe, and Ni as reported in the phase diagram of various binary alloy systems. [113][114][115][116][117][118][119][120][121][122].…”