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Particle interspacing effects on the mechanical behavior of a Fe–TiB2 metal matrix composite using FFT-based mesoscopic field dislocation mechanics

Journal Article · · Advanced Modeling and Simulation in Engineering Sciences
 [1];  [1];  [1];  [2];  [3]
  1. Univ. of Lorraine (France)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. ArcelorMittal Research, Maizieres-les-Metz (France)

This paper presents an application to metal matrix composites (MMCs) of an enhanced elasto-viscoplastic Fast Fourier Transform (EVP-FFT) formulation coupled with a phenomenological continuum Mesoscale Field Dislocation Mechanics (MFDM) theory. Contrary to conventional crystal plasticity, which only accounts for plastic flow and hardening induced by statistically stored dislocations (SSDs), MFDM-EVP-FFT also describes the evolution of polarized geometrically necessary dislocation (GND) density and its effect on both plastic flow and hardening. Numerical results for a Fe–TiB2 MMC made of a ferrite matrix (α-Fe) and elastic ceramic particles (TiB2) are presented. Full-field simulations are performed using synthetic periodic unit cells representative of the MMC, with single-crystalline and polycrystalline matrix, for different particle interspacing distances. A strong dependence of the predicted equivalent stress, cumulated plastic strain and GND density fields with particle interspacing distance is observed, in contrast with conventional crystal plasticity. Correlations between these mechanical fields and microstructural features, and their influence on local and global mechanical behavior are examined for the different MMC microstructures.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1739937
Report Number(s):
LA-UR--19-31404
Journal Information:
Advanced Modeling and Simulation in Engineering Sciences, Journal Name: Advanced Modeling and Simulation in Engineering Sciences Journal Issue: 1 Vol. 7; ISSN 2213-7467
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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