Metallurgical Abstracts on Light Metals and Alloys vol.54
Influence of nanovoids in the hydrogen embrittlement fracture of Al–Zn–Mg–Cu alloys
Kazuyuki Shimizu*, Hiroyuki Toda**, Chihiro Kadogawa**, Hiro Fujihara** and Akihisa Takeuchi***
*Department of Physical Science and Materials Engineering, Iwate University
**Department of Mechanical Engineering, Kyushu University
***Japan Synchrotron Radiation Research Institute
[Published in Materialia Volume 11, June 2020, 100667]
https://doi.org/10.1016/j.mtla.2020.100667
E-mail: ksmz[at]iwate-u.ac.jp
Key Words：Hydrogen embrittlement; Aluminum alloys; Nanovoids; Synchrotron X-ray tomography; 3D image analysis
Al–Zn–Mg alloys are representative high-strength aluminum alloys, but hydrogen embrittlement hinders further strengthening. The role of nanovoids in the hydrogen embrittlement of a hydrogen-charged Al–Zn–Mg–Cu alloy is examined using high-resolution imaging-type synchrotron X-ray tomography. Although nanovoids are initiated during deformation, their growth and coalescence behaviors are limited. Hydrogen partitioning analysis indicates that this is because most of the formed vacancies are not stabilized because of the low hydrogen occupancy. Furthermore, 3D/4D clustering analyses of nanovoids reveal that they do not aggregate on a specific plane to initiate a crack, and that linkage between nanovoids is less likely to occur.
