Phase equilibria and thermal analysis in the Fe–Mn–Ni system

Abstract

Phase equilibria and thermal analysis in the Fe-Mn-Ni system Based on the critical review of the experimental data available in the literature, 7 decisive ternary alloys were prepared. New phase transition temperatures and phase equilibria at 800 8C in the Fe -Mn -Ni system were measured. An effective method to accurately determine phase transition temperatures from differential thermal analysis curves with overlapped peaks and nonlevel baselines within a narrow temperature range was developed. A massive transformation was observed in one quenched Fe-rich alloy. In order to make the fcc_A1 phase always in the fully disordered state in the ternary system, the effect of the binary reciprocal parameter on the Gibbs energy of ternary ordered L1 2 phase was considered. It was found that the introduction of only one parameter could describe all reliable experimental data in the Fe -Mn -Ni system satisfactorily. The presently obtained parameters were successfully applied in two practical cases.

Development and characterisation of new high entropy alloy systems of dual and/or multiple phases

“…12 is a 2theta versus aging time graph of the two peaks included in the rectangular grey shaded areas in Figures 11.10 & 11.11.The average lattice constant calculated for the matrix in this experiment was 0.3599 nm, close enough to that of 0.3607 nm reported by Zhang's et al[326] for the Fe50.40Mn25.62Ni23.98 alloy.…”

“…The above behaviour has also been discussed by Zhang et al [326]. In that work, a Fe-Mn-Ni ternary phase diagram was proposed, based on new phase transition temperatures and phase equilibria.…”

“…In all cases, the strongest peaks at 2theta = 43, 50 and 73.5° can be mainly correlated to the double FCC matrix. Moreover, the difference in Fe content between the two matrices can be the main contributor to the existence of the double peaks near 43°, leading to slightly shifted peaks due to the change in lattice constants [326]. Additionally, the difference in Ti content between the two areas, may be another factor that induces the separation of the two peaks, as it was recently reported [332].…”

Experimental Investigation and Thermodynamic Reassessment of the Cu-Fe-Si System

“…[48] The elucidation of such an argument has been performed in the Cu-Fe-Mn [49] and Fe-Mn-Ni [50] systems in our group. As a continuous effort, the applications of the presently obtained thermodynamic parameters for the Cu-Fe-Si system are demonstrated for two technological applications, as discussed in Section VII.…”

(FeMnNi)84(AlTi)16 High-Entropy Alloy: Correlation of Microstructure, Strengthening Mechanisms and Hardness at Various Conditions (As-Cast, Solution Treated, Aged)

“…1 and 2), the strongest peaks at 43, 50, 73.5° 2 theta can be mainly correlated to a double FCC matrix. The double peaks near 43° may be attributed to the difference in Fe at% content between the two areas, leading to slightly shifted peaks due to the change in lattice constants [69]. Moreover another factor that may induce the separation of the two peaks is the difference in the solute Ti at% between the two areas, since it is recently reported that it can lead to this phenomenon [70].…”