Mg is known to be highly vulnerable to irradiation damage. Here we show, via in situ Kr ion irradiation studies inside a transmission electron microscope, that both defect density and size have been reduced substantially in porous Mg compared to dense coarse-grained Mg counterpart. Both prism and basal dislocation loops form at low dose in coarse-grained Mg, but basal loops dominate at a higher dose level. Meanwhile, in irradiated porous Mg, basal loops prevail throughout the entire irradiation process. Mechanisms that lead to enhanced irradiation tolerance of porous Mg are discussed.
Bibliographical noteFunding Information:
We acknowledge financial support by NSF-CMMI under grant no. 1728419 . HW acknowledges the support from the U.S. Office of Naval Research ( N00014-16-1-2778 ). We also acknowledge the use of microscopes at the Purdue Microscopy Center and the DoE Center for Integrated Nanotechnologies managed by Los Alamos National Laboratory. The IVEM facility at Argonne National Laboratory is supported by DOE-Office of Nuclear Energy.
© 2017 Acta Materialia Inc.
- Defect absorption
- In situ irradiation
- Irradiation tolerance
- Porous materials