Local Strain Development and Property Variability in B2 Intermetallics

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Abstract : The overall objective of this research program was to develop a quantitative understanding of the relationship of straining processes at the scale of microstructure to macroscopic mechanical properties of structural materials. To accomplish this, experimental high-resolution displacement mapping techniques for analysis of strains at the micron scale were developed and validated. Strain accumulation and its relationship to microstructural features in several variants of the B2 intermetallic RuAl were investigated. Significant heterogeneity of straining was observed within individual grains and among neighboring grains in all materials studied. The scale of strain heterogeneity was influenced by grain size and the presence of second phases along grain boundaries. Grain to grain strain distributions developed early in the straining process and strain maps revealed self-similar straining patterns during progressive loading. The relationship between grain-scale strains and deform

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