Mechanical properties of Fe–Al–M–C (M=Ti, V, Nb, Ta) alloys with strengthening carbides and Laves phase

Microstructure and mechanical properties of Fe3Al-based alloys with strengthening boride precipitates

“…Alloys 1 and 5 which exhibit relatively low room temperature strength possess the best high-temperature strength (z100 MPa at 800 C). Compared to corresponding binary alloys [22,37] the investigated materials show significantly increased yield strengths above 600 C and smaller strength values at room temperature. All materials exhibit the so called ''yield strength anomaly'', i.e.…”

“…The fractographs show transgranular cleavage, which occurs in all investigated alloys in both as-cast and as-annealed states. Transgranular cleavage is also observed in corresponding binary alloys [22,15], indicating that the boride precipitates do not weaken the grain boundaries as was observed in some carbide strengthened Fe 3 Al-based alloys where the fracture mode changed partially to intergranular cleavage [22]. However, there is a difference in scale of the cleavage facets in the as-cast state and after heat treatments, e.g.…”

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

“…The biggest disadvantage of Fe 3 Al alloys is their low ductility and a tendency to brittle fracture at room temperature which significantly impedes plastic working and a wider practical application of these materials [8,9]. Aside from a question of optimizing the chemical composition in terms of strength and restrictions of environmental fragility, the most important way to improve their ductile behavior is a structural refinement.…”

Novel ultra-high-strength (ferrite + austenite) duplex lightweight steels achieved by fine dislocation substructures (Taylor lattices), grain refinement, and partial recrystallization

“…Among lightweight steels, based on Fe-Mn-Al-C alloying system, austenitic or (ferrite + austenite) duplex microstructures are nominated for ultra-high-strength applications because the austenite has potentials of various strengthening mechanisms [10][11][12][13][14][15][16]. TRansformation-, TWinning-, and MicroBand-induced plasticity (TRIP, TWIP, and MBIP, respectively) mechanisms as well as short range ordering effects contribute to a superior combination of strength and ductility, and have been commonly interpreted by stacking fault energy (SFE).…”