- Title
- Surface damage of Ti₃SiC₂ by MeV iodine bombardment
- Creator
- Liu, Chaozhuo; Shi, Liqun; Qi, Qiang; O'Connor, D. J.; King, B. V.; Kisi, E. H.; Qing, X. B.; Wang, B. Y.
- Relation
- Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms Vol. 307, p. 536-540
- Publisher Link
- http://dx.doi.org/10.1016/j.nimb.2013.03.021
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2013
- Description
- The damage produced by a 2 MeV iodine ion beam in MAX-phase Ti₃SiC₂ polycrystalline targets at room temperature has been studied at doses up to 3 × 1015 ions cm−2. The evolution of microstructure and induced defects of the irradiated sample with different doses was surveyed by combining grazing incident X-ray diffraction (GIXRD) using synchrotron radiation and variable energy positron beam analysis (PBA). With increasing irradiation dose, the crystallinity degrades gradually and leads to a combination of damaged Ti₃SiC₂ in combination with the precipitation of a TiCₓ phase. For high dose irradiation, a nano-dispersed TiCₓ phase becomes the dominant component. The PBA measurements indicate the formation of a new large vacancy-type defect that could be a cluster or void. The combination of GIXRD and PBA demonstrates that the damage of the MAX phase is more serious in the first 10 nm surface layer than that in the deeper layers closer to the final resting position of the projectile in the solid. The possible damage mechanisms have been discussed.
- Subject
- titanium silicon carbide; MAX phase; ion irradiation; surface damage
- Identifier
- http://hdl.handle.net/1959.13/1332948
- Identifier
- uon:26983
- Identifier
- ISSN:0168-583X
- Language
- eng
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