A new crystallization pattern of nested tetrahedral lamellar structure for the face-centered cubic metals with low stacking fault energy. (September 2020)

• Record Type: Journal Article
• Authors: Wu, Yongquan; Zhou, Tao; Yu, Ronggang; Lai, Qinmei; Wang, Hao; You, Jinglin
• Is Part Of: Scripta materialia. Number 186(2020)
• Page Start: 74
• Page End: 78
• Publication Date: 2020-09
• Subjects: Nested tetrahedral lamellar (NTL) -- Face-centered cubic -- Molecular dynamics (MD) -- Stacking fault -- Crystallization pattern; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.04.031
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Image, graphical abstract