Journal
APPLIED SURFACE SCIENCE
Volume 437, Issue -, Pages 176-180Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.12.166
Keywords
Metallic glasses; Ion irradiation; Stress distribution; Whiskers growth; Self-healing
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Funding
- National Natural Science Foundation of China [51401028, 51271193, 11402277]
- Strategic PriorityResearch Program of the Chinese Academy of Sciences [XDB22040303]
- Opening Fund of State Key Lab of Nuclear Physics and Technology at Peking University
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Ti-based metallic glasses were subjected to a 20 MeV Cl4+ ion radiation under liquid-nitrogen cooling. Their responses, as well as effects of the electronic excitation and nucleus-nucleus collision were evaluated. The collision cascade during irradiation typically changes the structure by increasing the liquid-like zone/cluster, or the content of the free volume. However, along the ion incident depth, the structure change is inhomogeneous. Numerous whiskers appear and aggregate on the side of the irradiation surface, which are several micrometers away from the edge. This corresponds with the maximum collision depth obtained by the Monte Carlo simulation, where nuclear loss plays a dominant role. Moreover, the liquid-like zone continually forms, which add to the whiskers growth and subsequent self-healing. Results suggest that the irradiation-induced local shear stress combines with the well-localized liquid-like zone results in the observed phenomena. This study demonstrates that metallic glasses have high morphological instability under ion irradiation, which assets can pave new paths for their further applications. (C) 2017 Elsevier B.V. All rights reserved.
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