L21-ordered Fe–Al–Ti alloys

Combined ab initio and experimental study of structural and elastic properties of Fe3Al-based ternaries

“…Specifically, the lack of a linear trend for the Ti solutions is puzzling, since for Fee26Ale20Ti a clear linear trend (and thus also a nice quantitative agreement with theoretical DFT calculations) was found (see the paper by Krein et al in this volume [21]). Based on these results it appears that the linearization holds for medium concentrations of Ti but breaks down when reaching low Ti concentrations.…”

Synthesis of Fe-Al-Ti Based Intermetallics with the Use of Laser Engineered Net Shaping (LENS)

“…The fine-grained structure of iron aluminides is of interest in terms of increasing ductility and strength [1] as well as lowering the brittle-to-ductile transition temperature, as concluded in References. [7,10]. …”

“…The beneficial influence of Ti on the strength, creep resistance and oxidation behavior at elevated temperatures has been demonstrated [6,7,8,9,10,11]. Compared to other iron aluminides, the ternary Fe-Al-Ti intermetallic alloys exhibit a higher yield stress and creep resistance at temperatures up to 800 °C.…”

“…Palm and Sauthoff [7] reported that the properties of ternary Fe-Al-Ti alloys are controlled by not only the Al and/or Ti content but also by the phase formation and corresponding microstructure. In fact, grain refinement in the L2 1 -ordered Fe-Al-Ti alloys by TiB 2 precipitates results in the lowering of the brittle-to-ductile transition temperature (BDTT) [9,10]. Therefore, there is some potential to lower the BDTT by reducing the grain size of ternary Fe-Al-Ti alloys, which usually have a coarse-grained structure after conventional casting.…”

Combined ab initio and experimental study of A2 + L21 coherent equilibria in the Fe–Al–X (X = Ti, Nb, V) systems

“…The elastic properties of the composite material will be then dominated by the elastic properties of precipitates and then the approach used by Friak et al can be applied. This idea is implicit in the work of Krein et al [61] where the Young's modulus of Fee25Ale20Tie4Cr (at.%) was measured and compared with the value extrapolated from the results of Friak et al Although ab initio calculation of Young's modulus of these composite materials were not in the scope of this work, we think that the results of site occupation probabilities in the L2 1 phase as a function of Ti concentration for both two-phase fields, (B2 þ L2 1 ) and (A2 þ L2 1 ), is a nice contribution of our work to the accurate prediction of the elastic properties of FeeAleX (X ¼ Ti, Nb, V) alloys with a two-phase coherent microstructures. Then, we show these results in Fig.…”