Enhanced decomposition of rapidly solidified microstructures in Al-Fe-Mo and Ti-Al-Er alloys by plastic deformation and applied stress

In this work, the effects of plastic deformation and applied stress on enhanced decomposition of rapidly solidified microstructures in Al-8Fe-2Mo and Ti-Er alloys were examined. The results indicate that there is little effect of either plastic deformation or applied stress on decomposition of the Zone A microstructure in Al-8Fe-2Mo. It was concluded that the decomposition of the microstructure during low temperature extrusion must be a result of adiabatic heat generated during the process. The effect of plastic deformation and applied stress on microstructural degradation of erbia-strengthened Ti-Er alloys was found to be significant, the extent of coarsening as identified by average particle size increasing as a result of plastic deformation and with increased applied stress. Recrystallization was observed to reduce these effects. The difference in enhanced decomposition behavior between these two microstructures was concluded to be a result of the mechanism of microstructural degradation and atomic transport