title: Abnormal correlation between phase transformation and cooling rate for pure metals.
abstract: This work aims to achieve deep insight into the phenomenon of phase transformation upon rapid cooling in metal systems and reveal the physical meaning of scatter in the time taken to reach crystallization. The total number of pure metals considered in this work accounts for 14. Taking pure copper as an example, the correlation between phase selection of crystal or glass and cooling rate was investigated using molecular dynamic simulations. The obtained results demonstrate that there exists a cooling rate region of 6.3 × 10(11)-16.6 × 10(11) K/s, in which crystalline fractions largely fluctuate along with cooling rates. Glass transformation in this cooling rate region is determined by atomic structure fluctuation, which is controlled by thermodynamic factors. According to the feature of bond-orientation order at different cooling rates, we propose two mechanisms of glass formation: (i) kinetic retardation of atom rearrangement or structural relaxation at a high cooling rate; and (ii) competition of icosahedral order against crystal order near the critical cooling rate.
authors.affiliation: Fujian Key Laboratory of Materials Genome, College of Materials, Xiamen University, Xiamen 361005, P. R. China.
authors.forename: J J
authors.initials: JJ
authors.lastname: Han
authors.affiliation: Fujian Key Laboratory of Materials Genome, College of Materials, Xiamen University, Xiamen 361005, P. R. China.
authors.forename: C P
authors.initials: CP
authors.lastname: Wang
authors.affiliation: Fujian Key Laboratory of Materials Genome, College of Materials, Xiamen University, Xiamen 361005, P. R. China.|Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, P. R. China.
authors.forename: X J
authors.initials: XJ
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Z-K
authors.initials: ZK
authors.lastname: Liu
authors.affiliation: Shanghai University Materials Genome Institute and Shanghai Materials Genome Institute, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
authors.forename: T-Y
authors.initials: TY
authors.lastname: Zhang
authors.affiliation: International Center for New-Structured Materials (ICNSM), Laboratory of New-Structured Materials, State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: J Z
authors.initials: JZ
authors.lastname: Jiang