microstructural characteristics and stability in a rapidly solidified Al-Fe-Nb-Si alloy

摘要

The microstructure and stability in a rapidly solidified Al-Fe-Nb-Si alloy were studied by using transmission electron microscopy (TEM) with energy dispersive X-ray spectrometry (EDXS) and X-ray diffraction technique. It is shown that the addition of Nb to Al-Fe-Si alloy may increase Undercooling of melt, and form the featureless zone structure, the size of the intercellular phases And the distance between intercellulars of Al-Fe-Nb-Si alloy are tow times smaller than that of Al-Fe-V-Si alloy under the same conditions. Further, the microstructure of the featureless zone Has the better thermal stability after annealing at 623 K for 24 h.