Tensile and fatigue properties of the Bridgman directionally solidified Fe-Al-Ta eutectic

摘要

Fe-Al-Ta eutectic composites were obtained by a modified Bridgman directional solidification technique at different solidification rates. High-oriented lamellar (or rod-like) Fe2Ta(AI) phase is uniformly distributed into Fe(Al,Ta) matrix. Micro-hardness, tensile and high cycle fatigue properties of the Fe-Al-Ta eutectic at different solidification rates were systematically studied. Moreover, the fracture morphologies were observed by SEM. It is found that the mechanical properties of the Fe-Al-Ta eutectic composites are better than that of the as-cast Fe-Al-Ta eutectic alloy because of the directional heat flow. Finally, the strengthening mechanism of Fe-Al-Ta eutectic was discussed.