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Nanoscale Strain Mapping During in situ Deformation of Annealed Al-Mg Alloys

Al-Mg alloys represent an attractive option for weight-sensitive applications such as exterior car paneling, but serrated flow during plastic deformation limits their applicability (due to both poor formabilty and strain rate sensitivity for impact qualifications). Although serrated flow is a commonly experienced phenomenon during plastic deformation of these alloys [1], the fundamental dislocation processes responsible remain poorly understood. Recent advances in local strain mapping using nanobeam electron diffraction (NBED) have demonstrated the ability to observe single defects and the strain fields around them [2]. By observing dislocations, their strain fields, their movement under stress, as well as their interactions with each other and precipitates, we aim to provide insight into the fundamental mechanisms of serrated flow.