Precipitate formation in the Fe-Al-Nb and Fe-Al-Ta systems

Microstructure and Mechanical Properties of a Precipitation‐Strengthened Fe–Al–Nb Alloy

“…The evolution of the microstructure in Fe-24Al-2Nb-0.01B at 700 °C for durations up to 1000 h was studied elsewhere. [23] Heusler phase formation was also confirmed after 1 and 10 h at 700 °C, while no Heusler phase was observed after 100 h. [22] Observation of the Heusler phase after 4 and 22 h in the current alloy is, thus, in agreement with these findings.…”

“…As EBSD was performed in scan mode, discrimination of the ordering states of the Fe-Al is impossible, and it was indexed disordered A2 (Strukturbericht designation). Wet-chemical analysis was performed using PerkinElmer (Waltham, MA, USA) inductively coupled plasma optical emission spectroscopy setup using established standards (including B, see, for example, also more elaborated studies with varying B contents [20,22,23] which was specifically not the scope of the present investigation). An overview about all alloy compositions and processing conditions investigated in this study or taken from literature is found in Table 1.…”

“…However, solid solution strengthening was found to be the main strengthening mechanism since Laves phase precipitates are too coarse and Heusler phase forms only within a limited temperature range, from 600 °C (observed after 100 h) up to 700 °C (observed after 10 h). The addition of B accelerates the dissolution of the Heusler phase and precipitation of the stable Laves phase [ 21 ] (for Fe–Al–Ta, see also [ 12 ] ), however not in the alloys [ 22 ] that are investigated in the present publication, possibly because of the low concentration of B. Specifically, Heusler phase formed in Fe–24.4Al–2Nb–0.03B (all compositions in the article are provided in at.% unless otherwise noted).…”

Compressive Property and Toughening Mechanism of Directionally Solidified Fe(Al, Ta)/Fe2Ta (Al) Eutectic Composites

“…[6,7] Hardening alloy elements, for example, V, Ti, Cr, Ta, etc., can be used to solve its room-temperature brittleness defects. [8][9][10][11][12] For example, L. Senekova [13] discovered that a strong increase of the transition temperature from D03 structure to B2 structure of Fe-Al alloy by alloying with V.This allows the D03 structure to exist stably at higher temperatures, increasing the high temperature strength of the material. D. D. Risanti [9] tudied the alloying of Fe-Al and Ta.…”