title: Morphology and growth speed of hcp domains during shock-induced phase transition in iron.
abstract: Emergence and time evolution of micro-structured new-phase domains play a crucial role in determining the macroscopic physical and mechanical behaviors of iron under shock compression. Here, we investigate, through molecular dynamics simulations and theoretical modelings, shock-induced phase transition process of iron from body-centered-cubic (bcc) to hexagonal-close-packed (hcp) structure. We present a central-moment method and a rolling-ball algorithm to calculate and analyze the morphology and growth speed of the hcp phase domains, and then propose a phase transition model to clarify our derived growth law of the phase domains. We also demonstrate that the new-phase evolution process undergoes three distinguished stages with different time scales of the hcp phase fraction in the system.
authors.affiliation: Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China.
authors.forename: Wei-Wei
authors.initials: WW
authors.lastname: Pang
authors.affiliation: 1] Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China [2] Beijing Computational Science Research Center, Beijing 100084, People's Republic of China.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China.
authors.forename: Guang-Cai
authors.initials: GC
authors.lastname: Zhang
authors.affiliation: Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China.
authors.forename: Ai-Guo
authors.initials: AG
authors.lastname: Xu
authors.affiliation: Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China.
authors.forename: Xian-Geng
authors.initials: XG
authors.lastname: Zhao