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Predicting intragranular misorientation distributions in polycrystalline metals using the viscoplastic self-consistent formulation

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [3];  [4]
  1. Univ. of New Hampshire, Durham, NH (United States). Dept. of Mechanical Engineering; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Mechanical Engineering
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of New Hampshire, Durham, NH (United States). Dept. of Mechanical Engineering

In a recent paper, we reported the methodology to calculate intragranular fluctuations in the instantaneous lattice rotation rates in polycrystalline materials within the mean-field viscoplastic self-consistent (VPSC) model. Here, this paper is concerned with the time integration and subsequent use of these fluctuations to predict orientation-dependent misorientation distributions developing inside each grain representing the polycrystalline aggregate. To this end, we propose and assess two approaches to update the intragranular misorientation distribution within the VPSC framework. To illustrate both approaches, we calculate intragranular misorientations in face-centered cubic polycrystals deformed in tension and plane-strain compression. These predictions are tested by comparison with corresponding experiments for polycrystalline copper and aluminum, respectively, and with full-field calculations. It is observed that at sufficiently high strains some grains develop large misorientations that may lead to grain fragmentation and/or act as driving forces for recrystallization. Finally, the proposed VPSC-based prediction of intragranular misorientations enables modeling of grain fragmentation, as well as a more accurate modeling of texture using a computationally efficient mean-field approach, as opposed to computationally more expensive full-field approaches.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of New Hampshire, Durham, NH (United States)
Sponsoring Organization:
USDOE; LANL Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1479989
Alternate ID(s):
OSTI ID: 1549918
Report Number(s):
LA-UR--18-22506
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 140; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Computational Homogenization of Polycrystals text January 2018