Microstructural extremes and the transition from fatigue crack initiation to small crack growth in a polycrystalline nickel-base superalloy

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A combined grain scale elastic–plastic criterion for identification of fatigue crack initiation sites in a twin containing polycrystalline nickel-base superalloy (2016, unknown): “[1,2] reported that cracks initiated in high Schmid factor grains with slip planes parallel to and slightly offset from coherent twin boundaries in the nickel-based alloy René 88DT under very high cycle fatigue loading.”
Sub-Grain Scale Digital Image Correlation by Electron Microscopy for Polycrystalline Materials during Elastic and Plastic Deformation (2016, background): “[1, 2] reported for the nickel-based alloy René 88DT under very high cycle fatigue loading that cracks initiated in high Schmid factor grains parallel to and slightly offset from coherent twin boundaries.”
Crystal plasticity modelling and HR-DIC measurement of slip activation and strain localization in single and oligo-crystal Ni alloys under fatigue (2017, background): “The heterogeneity and localization of slip has already been much referenced (Carroll et al., 2013; Miao et al., 2012; Lim et al., 2014; Pinna et al., 2015; Tasan et al., 2014; Weaver et al., 2016), and is likely key to extreme processes such as fatigue crack nucleation.”