Microstructure evolution and mechanical behavior of as-cast, heat treated and directionally solidified Fe–15Al–10Nb alloys

摘要: Abstract Fe–15Al–10Nb (at.%) alloys containing Laves phase fibers embedded in a disordered α-(Fe,Al) matrix were investigated as-cast, heat treated and directionally solidified condition. Microstructure consisted of either duplex structure primary dendrites eutectic (as-cast treated) or fully (directionally solidified). Nanoindentation on the revealed their anisotropic features as well onset dislocation plasticity. Compression testing showed yield strength anomaly, which occurred 500–650 °C range. Directional alloy exhibited lowest fracture toughness whereas as-cast had highest toughness. The value stress exponent obtained from strain rate dependence flow indicated that climb mechanism dominated creep process. Deformation mechanisms also discussed related to microstructure evolution.