Abstract

The Fe-Mn phase diagram [1993Oka] contains no intermediate phases. It depicts a wide range of mutual solid solubility between fcc Fe and Mn. At 450 °C, the stable solid solutions are: bcc Fe based has a range of 0-3 at.% Mn, the fcc solid solution has a range of 25.5-52 at.% Mn, and ( Mn) is stable between 69.5-100 at.% Mn. The Fe-Zn phase diagram (Fig. 1 under the Fe-Zn system on page 544) exhibits a loop, extensive solubility of Zn in bcc Fe ( ), and four intermediate phases: , 1, , and . For crystal structure data of the Fe-Zn compounds, see Table 1 under Fe-Zn. The Mn-Zn phase diagram [1990Oka] 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 [1990Oka]. At the temperature of interest here (450 °C), the stable phases are ( Mn), ( Mn), the three modifications of the hexagonal phase ( , 1, and 2), the hexagonal MnZn9 phase (denoted by [1990Oka]), and the liquid. The low temperature modification of MnZn9 (denoted 1 by [1990Oka]) is isostructural with (FeZn10) [1995Reu] and forms peritectoidally at 424 °C [1990Oka]. The monoclinic MnZn13 phase, which is isostructural with (FeZn13), forms peritectically at 428 °C [1990Oka].

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