A new crystallization pattern of nested tetrahedral lamellar structure for the face-centered cubic metals with low stacking fault energy
YQ Wu and T Zhou and RG Yu and QM Lai and H Wang and JL You, SCRIPTA MATERIALIA, 186, 74-78 (2020).
It's well known that the lamellar (LAM) and five-fold-twinning (FFT) structures are two primary patterns during the early crystallization stage of FCC (face-centered cubic) metals. In this letter, we add a new third one, i.e. a nested tetrahedral lamellar (NTL) structure. In common with LAM and FFT, NTL is also a mixture of FCC and HCP (hexagonal close- packed). Differently, NTL has four tetrahedral growth orientations corresponding to four cellular bulges and a central core of tetrahedral shells nested one-by-one. This NTL acts also as the precursor of FFT and it has great differences in growth morphology and kinetics with LAM. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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