Abstract
In situ synchrotron x-ray imaging and diffraction are used to investigate anisotropic deformation of an extruded magnesium alloy AZ31 under uniaxial compression along two different directions, with the loading axis (LA) either parallel or perpendicular to the extrusion direction (ED), referred to as LA∥ED and LA⊥ED, respectively. Multiscale measurements including stress–strain curves (macroscale), x-ray digital image correlation (mesoscale), and diffraction (microscale) are obtained simultaneously. Electron backscatter diffraction is performed on samples collected at various strains to characterize deformation twins. The rapid increase in strain hardening rate for the LA∥ED loading is attributed to marked {101¯2} extension twinning and subsequent homogenization of deformation, while dislocation motion leads to inhomogeneous deformation and a decrease in strain hardening rate.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 86-94 |
| Number of pages | 9 |
| Journal | Acta Materialia |
| Volume | 120 |
| DOIs | |
| State | Published - Nov 1 2016 |
Funding
The authors are grateful to D. K. Qi and Y. Yao for assisting with sample preparation, and the PIMS x-ray team for supporting synchrotron experiments. This work was sponsored in part by the 973 project (No. 2014CB845904 ), and NSFC (No. 11472227 ) of China. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357 .
Keywords
- Dislocation
- Magnesium alloys
- Twinning
- X-ray digital image correlation
- XRD
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys