The previous review of this ternary system by [1991 Bha] presented from the work of [1974 Bud] three isothermal sections at 1000, 720, and 625 deg C for alloys containing Mn up to 30 at. percent. Recently, Reumont et al. [1995 Reu] determined an isothermal section for this system at 450 deg C. Binary Systems The Fe-Mn phase diagram [1993 Oka] contains no intermediate phases. It depicts a wide range of mutual solid solubility between fcc Fe and gamma Mn. At 450 deg C, the stable solid solutions are: bcc Fe based alpha has a range of 0-3 at. percent Mn, the fcc solid solution gamma has a range of 25.5-52 at. percent Mn, and (alpha Mn) is stable between 69.5-100 at. percent Mn. The Fe-Zn phase diagram (Fig. I under the Fe-Zn system on page 544) exhibits a gamma loop, extensive solubility of Zn in bcc Fe (alpha), and four intermediate phases: GAMMA, GAMMA_1, delta, and zeta. For crystal structure data of the Fe-Zn compounds, see Table 1 under Fe-Zn. The Mn-Zn phase diagram [1990 Oka] depicts a number of intermediate phases. Due to disagreements between various reports and the lack of confirmatory work, many parts of the diagram are tentative and qualitative [1990 Oka]. At the temperature of interest here (450 deg C), the stable phases are (alpha Mn), (beta Mn), the three modifications of the hexagonal epsilon phase (epsilon, epsilon_1, and epsilon_2), the hexagonal MnZn_9 phase (denoted delta by [1990 Oka]), and the liquid. The low temperature modification of MnZn_9 (denoted delta_1 by [1990 Oka]) is isostructural with delta (FeZn_(10)) [1995 Reu] and forms peritectoidally at 424 deg C [1990 Oka]. The monoclinic MnZn_(13) phase, which is isostructural with zeta (FeZn_(13)), forms peritectically at 428 deg C [1990Oka].
NSTL
