Multiscale measurements on temperature-dependent deformation of a textured magnesium alloy with synchrotron x-ray imaging and diffraction

Journal Article · Thu Jun 01 04:00:00 EDT 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.04.065· OSTI ID:1395880

Lu, L.; Bie, B. X.; Li, Q. H.; Sun, T.; Fezzaa, K.; Gong, X. L.; Luo, S. N.

In situ synchrotron x-ray imaging and diffraction are used to investigate deformation of a rolled magnesium alloy under uniaxial compression at room and elevated temperatures along two different directions. The loading axis (LA) is either perpendicular or parallel to the normal direction, and these two cases are referred to as LA⊥ and LAk loading, respectively. Multiscale measurements including stressestrain curves (macroscale), strain fields (mesoscale), and diffraction patterns (microscale) are obtained simultaneously. Due to initial texture, f1012g extension twinning is predominant in the LA⊥ loading, while dislocation motion prevails in the LAk loading. With increasing temperature, fewer f1012g extension twins are activated in the LA⊥ samples, giving rise to reduced strain homogenization, while pyramidal slip becomes readily activated, leading to more homogeneous deformation for the LAk loading. The difference in the strain hardening rates is attributed to that in strain field homogenization for these two loading directions

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE Office of Science; National Natural Science Foundation of China (NSFC)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1395880
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 132; ISSN 1359-6454
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Multiscale measurements
Digital image correlation
X-ray diffraction
Temperature
Twinning