Strengthening at high temperatures by precipitates in Fe–Al–Nb alloys

Microstructure and mechanical properties of directionally solidified Fe–Al–Nb eutectic

“…The high degree of thermal stability of many eutectics has also been associated to interfaces of low boundary energies. Special crystallographic relationships during directional solidification of eutectic alloys can occur in various forms, ranging from strict Fe-26Al-9.5Nb DS Fe-25Al-10Nb AC Fe-25Al-5Nb Fe-26Al-2Nb [13] Fe-26Al [23] Yield stress (MPa) Temperature (°C) Fig. 6.…”

“…6. Compressive yield stress in air at a deformation rate of 10 À4 s À1 of DS Fe-26Al-9.5Nb in comparison to as-cast (AC) Fe-25Al-10Nb, Fe-25Al-5Nb, Fe-26Al [23] and heat treated (1300 C/1 h þ 900 C/1 h) Fe-25Al-2Nb [13]. epitaxial to completely independent growth.…”

“…6 illustrates the compressive yield strength of DS Fe-26Al-9.5Nb in dependence of temperature. The data are compared with an as-cast alloy of about the same composition, and with three alloys with about the same Al content but which contain much less [13] or no Nb at all [23].…”

“…This study is concerned with the Fe-Al-Nb system, which has attracted some interest recently because of the possibility of strengthening Fe-Al-base alloys by precipitates of a L2 1 -ordered Heusler phase or by a hexagonal C14 Laves phase [10][11][12][13][14]. Very recently, Park et al investigated binary Fe-Nb eutectic and ternary Fe-Nb-Al hypoeutectic alloys [15].…”

Solidification and high-temperature phase equilibria in the Fe–Al-rich part of the Fe–Al–Nb system

“…[1][2][3][4][5]. One of the candidates frequently discussed as alloying addition is Nb [6][7][8][9][10]. A prerequisite for understanding and controlling the microstructure and the materials properties is a sound knowledge of the solidification behaviour and the phase equilibria in the ternary system.…”