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Title: Lattice instability during phase transformations under multiaxial stress: Modified transformation work criterion

Journal Article · · Physical Review B
 [1];  [2];  [2]
  1. Iowa State Univ., Ames, IA (United States). Dept. of Aerospace Engineering, Mechanical Engineering, and Material Science and Engineering; Ames Lab., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States). Dept. of Aerospace Engineering

A continuum/atomistic approach for predicting lattice instability during crystal-crystal phase transformations (PTs) is developed for the general loading with an arbitrary stress tensor and large strains. It is based on a synergistic combination of the generalized Landau-type theory for PTs and molecular dynamics (MD) simulations. The continuum approach describes the entire dissipative transformation process in terms of an order parameter, and the general form of the instability criterion is derived utilizing the second law of thermodynamics. The feedback from MD allowed us to present the instability criterion for both direct and reverse PTs in terms of the critical value of the modified transformation work, which is linear in components of the true stress tensor. It was calibrated by MD simulations for direct and reverse PTs between semiconducting silicon Si i and metallic Si ii phases under just two different stress states. Then, it describes hundreds of MD simulations under various combinations of three normal and three shear stresses. Finally, in particular, the atomistic simulations show that the effects of all three shear stresses along cubic axes on lattice instability of Si i are negligible, which is in agreement with our criterion.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; US Army Research Office (ARO)
Grant/Contract Number:
CMMI-1536925; DMR-1434613; W911NF-17-1-0225; N00014-16-1-2079
OSTI ID:
1418498
Journal Information:
Physical Review B, Vol. 96, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (5)

Stretch-Induced Melting and Recrystallization of Polyethylene-Plasticizer Film Studied by In Situ X-Ray Scattering: A Thermodynamic Point of View journal October 2018
Algorithmic aspects and finite element solutions for advanced phase field approach to martensitic phase transformation under large strains journal April 2019
Nanoscale mechanisms for high-pressure mechanochemistry: a phase field study journal March 2018
Atomistic Computational Analysis of the Loading Orientation-Dependent Phase Transformation in Graphite under Compression journal August 2019
High pressure phase transformations revisited journal March 2018

Figures / Tables (6)