Thermodynamic Assessment of the Mn-B System

Abstract

The phase equilibrium and thermodynamic data on the Mn-B system are critically reviewed. Based on the experimental data, a thermodynamic modeling is performed on this system. A set of self-consistent thermodynamic parameters is obtained and the calculated results are in general agreement with the experimental data. A parameter n is introduced to compare the degree of flatness of the dMn/L liquidus with those in other metal-boron systems. It is found that the dMn/ L liquidus is the flattest, which causes difficulties in its modeling. An effective approach to evaluate the thermodynamic parameters for o-Mn 2 B 0.982 phase is developed. Such an approach is valid for evaluating thermodynamic parameters of the phases with limited phase diagram data.

Thermodynamic Description of Ternary Fe-B-X Systems. Part 3: Fe-B-Mn/ Opis Termodynamiczny Trójskładnikowych Układów Fe-B-X. Część 3: Fe-B-Mn

“…In addition, the calculated boron solubility in these phases remains very low and comparable to that of Sun et al [6]. [6]. No difference between both can be detected visually Fig.…”

“…1-3 show the calculated Fe-B [1], Fe-Mn [5] and B-Mn phase diagrams [6], respectively. A reasonable agreement with the experimental data is observed.…”

“…According to the binary B-Mn description [6] used in this study, the MnB 2 and Mn 4 B phases are not stable at 800…”

“…• C according to the original binary B-Mn description of Sun et al [6] [8] The experimental topological data [11,[17][18][19] are compared with the calculated phase boundaries in a vertical section at 16.3 wt% B (Fig. 14).…”

“…The binary thermodynamic data used for the Fe-B system is taken from [1], from Huang [5] for Fe-Mn system and from Sun et al [6] for B-Mn system. Given that Sun et al [6] treated B as an interstitial component in the bcc, fcc, cbcc and cub phases, their descriptions were remodeled in the current study. Table 1 shows the phases and their modeling in the current Fe-B-Mn assessment.…”