Formation of intermetallic phases in unrefined and refined AA6082 Al alloys investigated by using SEM-based ultramicrotomy tomography

Effect of ultrasonic melt processing and Al-Ti-B on the microstructural refinement of recycled Al alloys

“…The size of primary Al 3 Fe phases in Al-Fe alloys is also reduced by Al-5Ti-1B addition [42] . Submicron-scale tomography results in Al-Mg-Si alloy [37] clearly demonstrated that Al-5Ti-1B reduces the number and length of α-Fe and β-Al 5 FeSi (β-Fe) particles. This improvement is produced because TiB 2 act as nucleation site for α-Fe and β-Fe.…”

“…This plays a critical role in the grain refinement, reducing pores and micro-segregations reduction, which enhances Al alloys mechanical properties [43] , [44] , [45] , [46] , [47] , [48] . Moreover, the Al-5Ti-1B addition can alter the solidification sequence and change the morphology of Fe-rich phases in Al alloys during solidification [34] , [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] . The influence of Al-5Ti-1B can be ascribed to the following three aspects: 1) refinement of the Fe-rich particles size without changing their type [35] , [36] , [42] ; 2) promotion of the formation of plate-like Fe-rich phases [37] , [38] , [39] , [40] ; 3) promotion of the transformation of Fe-rich phases from plate-like to Chinese-script [20] , [21] , [41] .…”

“…Moreover, the Al-5Ti-1B addition can alter the solidification sequence and change the morphology of Fe-rich phases in Al alloys during solidification [34] , [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] . The influence of Al-5Ti-1B can be ascribed to the following three aspects: 1) refinement of the Fe-rich particles size without changing their type [35] , [36] , [42] ; 2) promotion of the formation of plate-like Fe-rich phases [37] , [38] , [39] , [40] ; 3) promotion of the transformation of Fe-rich phases from plate-like to Chinese-script [20] , [21] , [41] . The formation of different Fe-rich phases depends on the alloy composition and cooling rate.…”