| The investigation has been carried out for the microstructural variation, phase transition, stress-strain behavior and fracture at elevated temperature in unidirectionally solidified AI-Fe-X(X=Ni, Zr) alloys by means of detailed stress-strain analysis and scanning electron microscopy. The X-ray diffraction and EDS analysis show the presence of Al₃Fe, Al₃Zr, and Al_6Fe compounds in Al-Fe-Zr alloy but show the presence NiFeAl_9 compound in Al-Fe-Ni alloy. The morphology of the composite structure has changed depending on the alloy, i.e., from the plate type to the rod type in Al-Fe-Zr alloy, and the ribbon type to the rod type in Al-Fe-Ni alloy. The mechanical properties of unidirectionally solidified Al-Fe-Ni alloy is better than those of the unidirectionally solidifed Al-Fe-Zr alloy. The fracture mode is divided into two type; one is the brittle fracture mode occurred in Al-Fe-Ni alloy, the other is the ductile fracture mode in Al-Fe-Zr alloy. |
|
