On the influence of crystallography and dendritic microstructure on micro shear behavior of single crystal Ni-based superalloys

摘要: Abstract An in-situ SEM micromechanical test technique is used to investigate the response of a Ni-based single crystal superalloy double shear loading. The present work shows that micro testing can detect mechanical differences between interdendritic and dendritic regions with γ′-volume fractions 77% 72%, respectively, i.e., exhibit larger flow stress than regions. These are apparent when specimens oriented for single-slip while they appear be overshadowed by dislocation interactions, multiple-slip promoted. Sudden deformation events observed occur concomitantly formation steps (localized plastic deformation) at surface zones during single-slip. show very low work-hardening. In contrast, much higher stresses required plastically deform which stronger No sudden could detected results in more homogeneous (absence localized deformation).