title: Crystallization in supercooled liquid Cu: Homogeneous nucleation and growth.
abstract: Homogeneous nucleation and growth during crystallization of supercooled liquid Cu are investigated with molecular dynamics simulations, and the microstructure is characterized with one- and two-dimensional x-ray diffraction. The resulting solids are single-crystal or nanocrystalline, containing various defects such as stacking faults, twins, fivefold twins, and grain boundaries; the microstructure is subject to thermal fluctuations and extent of supercooling. Fivefold twins form via sequential twinning from the solid-liquid interfaces. Critical nucleus size and nucleation rate at 31% supercooling are obtained from statistical runs with the mean first-passage time and survival probability methods, and are about 14 atoms and 10(32) m(-3)s(-1), respectively. The bulk growth dynamics are analyzed with the Johnson-Mehl-Avrami law and manifest three stages; the Avrami exponent varies in the range of 1-19, which also depends on thermal fluctuations and supercooling.
authors: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.
authors: J C
authors: JC
authors: E
authors: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.
authors: L
authors: L
authors: Wang
authors: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.
authors: Y
authors: Y
authors: Cai
authors: CAS Key Laboratory of Materials Behavior and Design, Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, People's Republic of China.
authors: H A
authors: HA
authors: Wu
authors: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.
authors: S N
authors: SN
authors: Luo