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Title: Overcoming the Time Limitation in Molecular Dynamics Simulation of Crystal Nucleation: A Persistent-Embryo Approach

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3]
  1. Ames Lab., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics
  3. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics; Univ. of Science and Technology of China, Hefei (China). Hefei National Lab. for Physical Sciences at the Microscale and Dept. of Physics

The crystal nucleation from liquid in most cases is too rare to be accessed within the limited time scales of the conventional molecular dynamics (MD) simulation. Here, we developed a “persistent embryo” method to facilitate crystal nucleation in MD simulations by preventing small crystal embryos from melting using external spring forces. We applied this method to the pure Ni case for a moderate undercooling where no nucleation can be observed in the conventional MD simulation, and obtained nucleation rate in good agreement with the experimental data. Moreover, the method is applied to simulate an even more sluggish event: the nucleation of the B2 phase in a strong glass-forming Cu-Zr alloy. The nucleation rate was found to be 8 orders of magnitude smaller than Ni at the same undercooling, which well explains the good glass formability of the alloy. In conclusion, our work opens a new avenue to study solidification under realistic experimental conditions via atomistic computer simulation.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Energy Research Scientific Computing Center (NERSC); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1422757
Report Number(s):
IS-J--9567
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 120; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Calculation of critical nucleation rates by the persistent embryo method: application to quasi hard sphere models journal January 2018
Nucleus-size pinning for determination of nucleation free-energy barriers and nucleus geometry journal May 2018
Temperature dependence of the solid-liquid interface free energy of Ni and Al from molecular dynamics simulation of nucleation journal November 2018
Interfacial free energy of a liquid-solid interface: Its change with curvature journal October 2019
Development of a semi-empirical potential suitable for molecular dynamics simulation of vitrification in Cu-Zr alloys journal December 2019
Effects of dopants on the glass forming ability in Al-based metallic alloy journal February 2019
Effects of Dopants on the Glass Forming Ability in Al-Based Metallic Alloy journal January 2018

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