Phase diagram for the niobium-rhenium system

First-principles calculation aided thermodynamic modeling of the Mo–Re system

“…Brewer and Lamoreaux [14,15] [11], Knapton [12] and Savitskii [13]. They are in agreement with each other within the measurement uncertainties.…”

“…Dickinson et al [11], Knapton et al [12], and Savitskii et al [13] have independently studied the Mo-Re phase diagram, based on optical pyrometry, X-ray diffraction, and metallographic investigations. Brewer and Lamoreaux [14,15] [11], Knapton [12] and Savitskii [13].…”

“…In a later discussion [11], Knapton mentioned that the s phase is stable only at temperatures higher than 1100 C. He did not find the s phase by either annealing the supersaturated bcc(Mo,Re) solid solutions or mixing Mo and Re powders at temperatures around 1100 C and below. The annealing temperatures in both Dickinson [11] and Savitskii's [13] studies were higher than 1100 C, which was not low enough to detect the eutectoid reaction s 4 bcc(Mo,Re) þ c. In addition, a review of the phase diagrams of V-Re, Nb-Re, Ta-Re, Cr-Re indicates that the s phase in all these systems becomes unstable at low temperatures [16]. Therefore, this eutectoid reaction was included in the current modeling based on Knapton's work [12].…”

Thermodynamic assessment of the Al-Re system

“…In order to improve the creep and fatigue behavior of Ni-based superalloys, rhenium is one of the important elements added to theses alloys [2,3].Knowledge of phase diagram and thermochemical properties of the Al-Re system is important for understanding the phase equilibria between Al and Re and designing materials with desired properties.Several authors studied the Al-Re binary diagram experimentally [4][5][6][7]. Comparison of already determined phase diagrams shows that they are in clear contradiction [8].…”

“…Several authors studied the Al-Re binary diagram experimentally [4][5][6][7]. Comparison of already determined phase diagrams shows that they are in clear contradiction [8].…”