Structure of melt—spun Al—2.5Ti—2.5Fe—2.5V alloy and structural changes during annealing

Rapidly solidified Al-2.5Ti-2.5Fe-2.5V alloy was prepared by melt spinning.As-spun and as-annealed microstructures were studied by TEM,HREM,XRD and EDS analysis.The microhardness of the alloy at different annealing temperature was measured.The resultds show that the as-spun microstructure of the alloy ineludes four kinds of primary phases;Al11(V,Ti),AlTi3,Al80(V,Ti)20 and Al82(Fe,Ti,V)18 phase.After annealing at 300℃ for 10h,metastable phase Al82(Fe,Ti,V)18 transforms to the stable phase Al13Fe4.After annealing at 400℃ for 10h,the primary phases Al11(V,Ti) and AlTi3 has completely transformed to Al80(V,Ti)20 and Al23 Ti9 phaes,re-spectively,The addition of element V increases the microhardness of melt-spun Al-2.5Ti-2.5Fe alloy at elevated temperatures.