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Title: Modeling of intragranular misorientation and grain fragmentation in polycrystalline materials using the viscoplastic self-consistent formulation

In this paper, the recently established methodology to use known algorithmic expressions of the second moments of the stress field in the grains of a polycrystalline aggregate for calculating average fluctuations of lattice rotation rates and the associated average intragranular misorientation distributions using the mean-field viscoplastic self-consistent (VPSC) formulation is extended to solve the coupled problem of considering the effect of intragranular misorientations on stress and rotation rate fluctuations. In turn, these coupled expressions are used to formulate and implement a grain fragmentation (GF) model in VPSC. Case studies, including tension and plane-strain compression of face-centered cubic polycrystals are used to illustrate the capabilities of the new model. GF-VPSC predictions of intragranular misorientation distributions and texture evolution are compared with experiments and full-field numerical simulations, showing good agreement. In particular, the inclusion of misorientation spreads reduced the intensity of the deformed texture and thus improved the texture predictions. Finally and moreover, considering that intragranular misorientations act as driving forces for recrystallization, the new GF-VPSC formulation is shown to enable modeling of microstructure evolution during deformation and recrystallization, in a computationally efficient manner.
 [1] ;  [2] ;  [2] ;  [1]
  1. Univ. of New Hampshire, Durham, NH (United States). Dept. of Mechanical Engineering
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0749-6419
Grant/Contract Number:
AC52-06NA25396; CMMI-1650641
Accepted Manuscript
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Name: International Journal of Plasticity; Journal ID: ISSN 0749-6419
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of New Hampshire, Durham, NH (United States)
Sponsoring Org:
USDOE; LANL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
Country of Publication:
United States
36 MATERIALS SCIENCE; microstructures; crystal plasticity; viscoplastic material; numerical algorithms; GF-VPSC
OSTI Identifier: