Microscopic heterogeneity of plastic strain and lattice rotation in partially recrystallized copper polycrystals

• Partial recrystallization of highly deformed polycrystalline aggregates creates a bimodal grain size distribution, which improves ductility while maintaining relatively high strength. In this work, the microstructure evolution during isothermal annealing of cold rolled copper samples was investigated using electron backscattered diffraction (EBSD) and the macroscopic mechanical strength of partially recrystallized samples was measured under uniaxial tension. Different models were tested in order to reproduce both the macroscopic mechanical response and the microscopic strain field inside a sample with 41% recrystallized grains loaded inside a scanning electron microscope to allow in-situ EBSD mapping. Crystal plasticity based finite element modeling (CPFEM) performed on a 2D mesh conforming to the experimental microstructure was compared to 3D predictions on an idealized model microstructure. © 2019

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Nyckelord

Cold rolling

Copper

Grain size and shape

Isothermal annealing

Metal cladding

Microstructure

Recrystallization (metallurgy)

Scanning electron microscopy

Strain

Bimodal grain-size distribution

Electron back-scattered diffraction

Heterogeneity of plastic strain

Micro-structure evolutions

Partial recrystallization

Polycrystalline aggregates

Recrystallized grains

Recrystallized samples

Copper metallography

Materialteknik

Materials Engineering

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