Evidence Supporting Reversible MFe–Mn T. Sawaguchi 1, Y. Tomota 2, F. Yoshinaka 1 and S. Harjo 3 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) 2 National Institute of Advanced Industrial Science and Technology (AIST) 3 J-PARC Center, Japan Atomic Energy Agency Fe–Mn–Si-based alloys, such as Fe–30Mn–4Si–2Al and Fe–15Mn–10Cr–8Ni–4Si (in mass%), show superior resistance to plastic fatigue compared to the conventional steels, which is ascribed to the reversible back-and-forth movement of {111} ⟨11-2⟩ γ Shockley partial dislocations associated with a reversible martensitic transformation between the face-centered cubic γ-austenite and hexagonal close-packed ε-martensite. The purpose of this study was to gather evidence of the reversible martensitic transformation using in situ neutron diffraction under cyclic loading. Three Fe–30Mn–Si–Al alloys with →ε = −250 J/mol), Fe–30Mn–5Si–different Gibbs free energy differences at 298 K: Fe–30Mn–6Si (ΔGγ1Al (ΔGγ→ε = −8.5 J/mol), were studied to unravel the effect of phase stability on the degree of reversibility. The reversible martensitic transformation between γ-austenite and ε-martensite during tension–compression loading is demonstrated as bulk-averaged insights in the Fe–30Mn–4Si–2Al alloy. The forward γ→ε transformation was induced by tensile loading, and the formed ε plates were reversed to γ during unloading and subsequent compressive loading. Corrosion Behavior of Gd2Si2O7/ Sc2Si2O7 with CCoatings S.H. Kim 1, T. Osada 1 and B.K. Jang 2 1 Research Center for Structural 2 Interdisciplinary Graduate School of Engineering Science, Kyushu University This study presents the high-temperature corrosion behavior of dual RE-disilicate. The high-temperature corrosion behavior of dual rare-earth disilicate sintered Gd2Si2O7 (70 vol%) + Sc2Si2O7 (30 vol %) and CMAS melts applied as promising EBCs materials were evaluated for 0.5, 2, 12, and 48 h at 1400°C. The reaction layer was classified into two layers. Ca2Gd8(SiO4)6O2 (apatite) grown vertically in the form of elongated morphology by reaction of single Gd2Si2O7 with CMAS in the top part and Ca2Gd8(SiO4)6O2 mixed with Sc2Si2O7 were analyzed. When comparing the results of the previous study in Gd2Si2O7, the high-temperature corrosion reaction layer of CMAS and single Gd2Si2O7 (100%) is reduced by 20%. 56PP22--2255 –Si–Al Alloys Using in Situ Neutron Diffraction PP22--2266 →ε = −128 J/mol), and Fe–30Mn–4Si–2Al (ΔGγPoster Presentation ｜NIMS Award Symposium 2023 Materials, National Institute for Materials Science (NIMS) artensitic Transformation under Cyclic Loading on MAS M P2 ｜ Characterizationelts for Environmental Barrier
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