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Title: Development of an interatomic potential for the simulation of defects, plasticity, and phase transformations in titanium

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4964654· OSTI ID:1350058
 [1];  [2];  [3]
  1. Ames Lab., Ames, IA (United States)
  2. Univ. of Bath, Bath (United Kingdom)
  3. Univ. of Edinburgh, Scotland (United Kingdom)

New interatomic potentials describing defects, plasticity, and high temperature phase transitions for Ti are presented. Fitting the martensitic hcp-bcc phase transformation temperature requires an efficient and accurate method to determine it. We apply a molecular dynamics method based on determination of the melting temperature of competing solid phases, and Gibbs-Helmholtz integration, and a lattice-switch Monte Carlo method: these agree on the hcp-bcc transformation temperatures to within 2 K. We were able to develop embedded atom potentials which give a good fit to either low or high temperature data, but not both. The first developed potential (Ti1) reproduces the hcp-bcc transformation and melting temperatures and is suitable for the simulation of phase transitions and bcc Ti. Two other potentials (Ti2 and Ti3) correctly describe defect properties and can be used to simulate plasticity or radiation damage in hcp Ti. The fact that a single embedded atom method potential cannot describe both low and high temperature phases may be attributed to neglect of electronic degrees of freedom, notably bcc has a much higher electronic entropy. As a result, a temperature-dependent potential obtained from the combination of potentials Ti1 and Ti2 may be used to simulate Ti properties at any temperature.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
EP/K014560; AC02-07CH11358
OSTI ID:
1350058
Alternate ID(s):
OSTI ID: 1329085
Report Number(s):
IS-J-9152; TRN: US1701369
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 15; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 92 works
Citation information provided by
Web of Science

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Cited By (19)

Transferability of interatomic potentials in predicting the temperature dependency of elastic constants for titanium, zirconium and magnesium journal January 2019
Formation free energies of point defects and thermal expansion of bcc U and Mo journal April 2019
DL_MONTE: A multipurpose code for Monte Carlo simulation preprint January 2018
DL_MONTE: a multipurpose code for Monte Carlo simulation journal February 2019
Studying Stability of Atom Packing for Ti Nanoparticles on Heating by Molecular Dynamics Simulations journal August 2018
Molecular dynamics simulation of the solid-liquid interface migration in terbium journal June 2018
Ti and its alloys as examples of cryogenic focused ion beam milling of environmentally-sensitive materials text January 2019
Extending the range of measurement of thermal imaging diagnostics of a high-intensity pulsed ion beam journal July 2019
Methods for the determination of diffusionless transformation conditions from atomistic simulations journal January 2019
The α → ω Transformation in Titanium-Cobalt Alloys under High-Pressure Torsion text January 2018
Mechanical instabilities in the modeling of phase transitions of titanium journal June 2018
Stacking faults and the -surface on first-order pyramidal planes in -titanium journal February 2017
Bond-order potentials for the Ti 3 AlC 2 and Ti 3 SiC 2 MAX phases journal December 2019
Phase transitions in titanium with an analytic bond-order potential journal October 2019
Non-Arrhenius diffusion in bcc titanium: Vacancy-interstitialcy model journal November 2020
Size of the Plastic Zone Produced by Nanoscratching journal December 2017
Atomistic description of self-diffusion in molybdenum: A comparative theoretical study of non-Arrhenius behavior journal January 2020
Development of a semi-empirical potential suitable for molecular dynamics simulation of vitrification in Cu-Zr alloys journal December 2019
Ti and its alloys as examples of cryogenic focused ion beam milling of environmentally-sensitive materials journal February 2019

Figures / Tables (13)


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