Abstract
Refining effect of trace B addition in Al-Si-Cu-Mn-Ni alloy on primary Mn-rich phase was studied by OM, SEM, TEM and HRTEM. Addition of trace B (0.02 wt%) remarkably alters the morphology of primary Mn-rich phase from coarse dendritic to fine short-rod-like or blocky, and significantly reduces its size. TEM/HRTEM characterizations clarify that the fine particles embedded in the short-rod-like or blocky Al3MnSi2 phase are (V,Ti,Mn)B2 phase. One good matching orientation relationship between Al3MnSi2 phase and (V,Ti,Mn)B2 phase is confirmed by E2EM model calculation, indicating that (V,Ti,Mn)B2 phase has a strong potential as the heterogeneous nucleation substrate for Al3MnSi2 phase during solidification. So, trace addition of B and the impurity elements in Al-Si-Cu-Mn-Ni alloy leads to the formation of fine (V,Ti,Mn)B2 particles that greatly enhances the nucleation of primary Al3MnSi2 phase and thus significantly reduces its size.
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