jet deposition;  microstructure;  Al-Fe-V-Si alloy;  Mechanical properties

The microstructure of Al-Fe-V-Si alloy in the deposition state and hot extrusion at different temperatures was studied by optical and transmission electron microscopy, and it was found that high-density fine silicide particles were evenly distributed on the α-Al matrix, and these fine silicide particles could maintain good stability after high temperature extrusion, which played a major role in improving the high temperature performance of the alloy. Some hexagonal block phases were found in extruded alloys at temperatures of 300 °C and above, and it was analyzed that the lack of V element caused by the fluctuation of local element composition of the alloy promoted the sagittal stable transformation of metastable α-AlFeSi phase, and the existence of hexagonal block phase was the main reason affecting the high temperature performance of the alloy.