Microstructures and mechanical properties of Fe-Al-Ta alloys with strengthening Laves phase

► Three partial isothermal sections at 800, 1000 and 1150 °C of Fe-Al-Ta alloys. ► The solubility of Ta in Fe-Al-Ta is low and varies with Al content. ► The TTT diagram of L21-C14 transformation at temperatures between 600 and 750 °C. ► L21-Heusler phase increases the yield stress and creep resistance at temperatures below 700 °C.