Rapidly Solidified and Extruded Al-Fe-V-Si Alloy for High Temperature

摘要

The microstructure of AlFeVSi alloys(Fe :6.8-7.4%, V: 1.5-2%, Si: 1.5-2%, Bal Al) prepared by rapid solidification techniques such as gas atomization, melt spinning and extruded were investigated to reveal the microstructural evolution associated with the processing condition variations. The primary intermetallic phase was characterized as quarternary bcc a-Al_(12)(Fe,V)_3Si having lattice parameter in the range 12.51-12.53 nm and other phases are identified as icosahedral, Al_3Fe and Al_(13)(Fe,V)_4 by XRD. Various phase morphologies such as starlike, band shape and needlelike intermetallics were observed at these products, whereas the primary phase crystal structure is cubic and stable. Cracking of Al_(13)(Fe,V)_3Si Silicides were observed in the extruded bars at 455 C.