Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 146, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2021.103084
Keywords
Misorientation; Heterogenous plastic deformation; Loading history; Grain size; Crystallographic orientation; Polycrystalline materials; In-situ SEM; EBSD; Titanium
Funding
- US Department of Energy, Office of Basic Energy Science [DE-SC0001525]
- U.S. Department of Energy (DOE) [DE-SC0001525] Funding Source: U.S. Department of Energy (DOE)
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The correlation between plastic strain and crystallographic misorientation, grain size, grain orientation, distance from grain boundary, and loading history was investigated for BCC polycrystalline microstructures. Small grains exhibited a lower level of misorientation dispersion compared with larger grains, and this discrepancy became more pronounced at higher strains. An empirical equation was proposed to estimate the level of misorientation dispersion for individual grains.
The correlation between plastic strain and crystallographic misorientation, grain size, grain orientation, distance from grain boundary, and loading history were investigated experimentally and numerically for body-centered-cubic (BCC) polycrystalline microstructures based on a misorientation deviation (MD) approach. Nine monotonic tensile experiments were performed on two BCC titanium alloys inside a scanning electron microscope (SEM). The influence of reference orientation was explored both at the grain scale and at the mesoscale using electron backscattered diffraction (EBSD). The correlation between global plastic strain and the MD was quantified. The tendency for orientation change was quantified as a function of plastic strain and grain orien-tation for three crystallographic orientations (i.e., [100], [110], and [111]) with respect to tensile direction. The subpopulation of small grains exhibited a lower level of misorientation dispersion compared with larger grains, and this discrepancy became more pronounced at higher strains. An empirical equation was proposed to estimate the level of misorientation dispersion for individual grains as a function of grain size and global plastic strain level. Two interrupted in-situ SEM experiments were performed, and this resulted in a significantly increased misorientation compared with uninterrupted tests performed to similar plastic strain levels.
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