A New Crystallization Pattern of Nested Tetrahedral Lamellar Structure for the Face-Centered Cubic Metals with Low Stacking Fault Energy
A New Crystallization Pattern of Nested Tetrahedral Lamellar Structure for the Face-Centered Cubic Metals with Low Stacking Fault Energy
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DOI：
10.2139/ssrn.3557613
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
Yongquan Wu;Tao Zhou;Ronggang Yu;Qinmei Lai;Hao Wang;J. You
中科院分区：
文献类型：
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作者：
Yongquan Wu;Tao Zhou;Ronggang Yu;Qinmei Lai;Hao Wang;J. You
摘要众所周知，面心立方金属在晶化初期的两种主要结构是层状结构（LAM）和五重孪晶（FFT）。在这封信中，我们增加了一个新的第三个，即嵌套四面体片层（NTL）结构。与LAM和FFT一样，NTL也是FCC和HCP（六方密堆积）的混合物。NTL具有四个四面体生长方向，对应于四个胞状凸起和一个由四面体壳一一嵌套的中心核。该NTL也充当FFT的前体，并且其在生长形态和动力学上与LAM有很大差异。
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.