Abstract
Grain boundary (GB) engineering was carried out on a Ni-based alloy with pre-precipitated carbides at GBs. Microstructure with coexistence of ∑3n boundaries formed during annealing and traces of disappeared original GBs were observed during GB-engineering. The newly formed ∑3n boundaries are in different positions with that of disappeared original GBs, which indicates the recrystallization front GBs moved into the deformed matrix and swept away original GBs. It is a typical recrystallization process rather than GB decomposition. Strain induced boundary migration initiated the recrystallization. Grain-cluster formed with the continuous occurrence of twinning-events in the wake of the migrating recrystallization front GBs during sweeping away the deformed matrix. Finally large grain-clusters with highly twinned interconnecting ∑3n boundaries were formed.
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