High-Throughput Microstructure Analysis
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Los Alamos National Laboratory 1/29/2018 | 1 High Throughput Microstructure Analysis • Zr EBSD analysis: Juan et al., Acta Mater (2015); Mg EBSD analysis: Beyerlein et al, Phil. Mag (2010) METIS is a software that analyzes EBSD maps on low symmetry materials and extracts statistical correlations between key markers of the microstructure (e.q. twins, grain size, grain boundary length). The data is used to guide materials design and test reduced order microstructure evolution models DATABASE (in SQL basis) DATA PROCESSING (automated using shell scripts, SQL requests, fortran/C++ programs and gnuplot) Processing EBSD image Twinning frequency Twin area fraction # of twins per twinned grain Average twin thickness Twin variant distribution Twin thickness at GB Crossing twin thickness at GB Twin crossing frequency Twinning features Grain size GB length GB Misorientation Grain orientation Principle: EBSD files are numerically analyzed through the lens of graph theory in order to generate a searchable SQL database from which statistical correlations are quantified. The software comes with a graphical user interface
Transcript of High-Throughput Microstructure Analysis
Los Alamos National Laboratory
1/29/2018 | 1
High Throughput Microstructure Analysis
• Zr EBSD analysis: Juan et al., Acta Mater (2015); Mg EBSD analysis: Beyerlein et al, Phil. Mag (2010)
METIS is a software that analyzes EBSD maps on lowsymmetry materials and extracts statistical correlationsbetween key markers of the microstructure (e.q. twins, grainsize, grain boundary length). The data is used to guidematerials design and test reduced order microstructureevolution models
DATABASE (in SQL basis)
DATA PROCESSING(automated using shell scripts, SQL requests,
fortran/C++ programs and gnuplot)
Processing EBSD image
Twinning frequency
Twin area fraction
# of twins per twinned grain
Average twin thickness
Twin variant distribution
Twin thickness at GB
Crossing twin thickness at GB
Twin crossing frequency
Twinning features
Grain size
GB length
GB Misorientation
Grain orientation
Principle: EBSD files are numerically analyzed through the lens of graph theory in order to generate a searchable SQL database from which statistical correlations are quantified. The software comes with a graphical user interface
Los Alamos National Laboratory
1/29/2018 | 2
• Revisiting the Hall-Petch for twins• Understanding twin variant
distribution• Role of type III stresses in
nucleation• Effect of neighbors on twin growth
Tensile and compressive twin modes in Zr deformed at 76K
High Throughput Microstructure Analysis: exampleProblem: During loading of Zirconium, severemicrostructure changes take place. These aremediated by the generation of twin domainsleading to either extension (T1,T2) orcompression (C1) of the c-axis of the crystals.Nucleation and growth of twins is guided by thelocal microstructure
Goal: Identify the relationship between grain size and twin activation
