Development of local plasticity around voids during tensile deformation

TL;DR

This study combines experiments and simulations to analyze how local plasticity develops around voids in a nickel superalloy during tensile deformation, providing insights into failure mechanisms.

Contribution

It introduces an integrated experimental and simulation approach to understand local plasticity around voids in single crystal superalloys.

Findings

Plastic deformation around voids is influenced by image forces and forest hardening.

Slip activity is restricted to specific slip systems despite multiple possible systems.

The study enhances understanding of void-induced failure in engineering components.

Abstract

Voids can limit the life of engineering components. This motivates us to understand local plasticity around voids in a nickel base superalloy combining experiments and simulations. Single crystal samples were deformed in tension with in-situ high angular resolution electron back scatter diffraction to probe the heterogeneous local stress field under load; the reference stress is informed by crystal plasticity finite element simulations. This information is used to understand the activation of plastic deformation around the void. Our investigation indicates that while the resolved shear stress would indicate slip activity on multiple slip systems, slip is reduced to specific systems due to image forces and forest hardening. This study rationalizes the observed development of plastic deformation around the void, aiding in our understanding of component failure and engineering design.