Critical assessment and experimental investigation of Co–Ni–Ti phase equilibria

Diffusion multiple study of Co-Ni-Ti system at 1073 K

“…Hence the unlimited solubility of the binary phases CoTi2 and NiTi2 as (Co,Ni)Ti2, CoTi and NiTi as (Co,Ni)Ti have been observed. A large solubility of the third member in the binary phases of Ni3Ti and Co3Ti wasere also reported [7]. The stable temperature range of the ternary phase _Ti(Ni0.5Co0.5)3 is still in controversial.…”

“…If volume change and solubility in the primary phase are neglected, the integrated interdiffusion coefficient for IMC with a narrow homogeneity range, can be calculated using equation 2, as proposed by Wagner [22]   The Ti-Co system hasve five binary compounds [7]. As shown in Fig.…”

“…Due to the importance of the Co-Ni-Ti system for industrial application, thermodynamics and phase relations of this system have attracted a lot of investigations [5][6][7][8][9][10][11]. Isothermal sections of this system have been determined for 1373K [12], 1173K [5,7], 1123K [6], and 1073K [10], where one ternary phase _Ti(Ni0.5Co0.5)3 was reported [5]. Riani et al [7] critically assessed this system.…”

“…Isothermal sections of this system have been determined for 1373K [12], 1173K [5,7], 1123K [6], and 1073K [10], where one ternary phase _Ti(Ni0.5Co0.5)3 was reported [5]. Riani et al [7] critically assessed this system. Recently, Zhou et al [12] established the liquid surface and proposed the invariant reaction scheme for the Co-Ni-Ti system.…”

“…This ternary phase was not observed in the experimental work by Gryzunov et al [10] (at 1073K) and Du et al [6] (at 1123K). Riani et al [7] reported theat stability of the ternary phase _Ti(Co,Ni)3 down to 773°C, derived from microstructure analysis of by the equilibrium information shown in the annealed alloys which is were cooled down after arc-melting. However, it can be questioned that where thethe annealed alloys had reached the equilibrium status shown in these annealed alloys can also be questionede.…”