Studies On Microstructures And Properties Of Melt-spun Al-Ti-Fe System Alloys

Rapidly solidified ribbons of the Al-2.5Ti-2.5Fe, Al-2.5Ti-2.5Fe-2.5Cr and Al-2.5Ti-2.5Fe-2.5V (at.%) alloy were produced by melt spinning (cooling rate 105-106k/s). the as-quenched and as-annealed microstructures of each rapidly solidified alloy ribbon were investigated by using XRD, DSC, TEM, HREM, EDS. A 71 Vickers hardness tester measured the ambient-temperature microhardness of the alloys annealed at different temperatures respectively. The measured region is near the chill surface of the ribbon. The thermal stability could be estimated indirectly by measuring the ambient-temperature microhardness after the isothermal annealing at different temperatures. The paper analyzed the influences on the microstructures and properties of the rapidly solidified Al-Ti-Fe alloy after the addition of Cr and V elements, respectively. The evolution processes of the phases and microstructures of rapidly solidified Al-2.5Ti-2.5Fe, Al-2.5Ti-2.5Fe-2.5Cr and Al-2.5Ti-2.5Fe-2.5V alloy at elevated temperatures were studied.The study indicates that the additions of Cr and V transition metal elements are beneficial to the thermal stability of the melt-spun Al-2.5Ti-2.5Fe alloy. The Cr and V elements can greatly improve the thermal stability of the Al-2.5Ti-2.5Fe alloy, which will provide the theoretical basis for the elevated temperature application of the Al-Ti-Fe system alloys.