Effects of He irradiation on Ti3AlC2: Damage evolution and behavior of He bubbles

Wang, Chenxu; Yang, Tonghai; Kong, Shuyan; Xiao, Jingren; Xue, Jianming; Wang, Qian; Hu, Chunfeng; Huang, Qing; Wang, Yugang

doi:10.1016/j.jnucmat.2013.04.070

Cited by 67 publications

(66 citation statements)

References 20 publications

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“…Some diffraction orders extinct, indicating a loss of chemical order along the c-axis. Only diffraction spots are observable in the SAED pattern after irradiation, signature of a crystalline material, and without an amorphous contribution, in good agreement with the results of Whittle et al [14] and Wang et al [15]. The dark field micrographs (a) and (b) show that the corresponding diffraction spots originate from the film and the substrate.…”

Section: Evolution As a Function Of The Irradiation Dosesupporting

confidence: 89%

“…There are only few studies about the behavior of MAX phases under ion irradiation, almost exclusively focused on Ti 3 AC 2 (A = Si, Si 1−x Al x , Al) [7,8,9,10,11,12,13,14,15], in addition to (Ti 0.95 Zr 0.05 ) 3 SiC 2 [16] and (Ti,Al)N/Ti 2 AlN x multilayers [17]. They highlight a strong tolerance to damage induced by ion irradiation and a retained crystalline structure, to the exception of Cr 2 AlC and Cr 2 GeC, which amorphize at moderate fluence (10 13 -10 14 Xe.cm −2 ) [18].…”

Section: Introductionmentioning

confidence: 99%

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Contribution of core-loss fine structures to the characterization of ion irradiation damages in the nanolaminated ceramic Ti3AlC2

et al. 2013

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The effect of low energy ion irradiation in the nanolaminated Ti 3 AlC 2 is investigated by means of X-ray diffraction, transmission electron microscopy, electron energy loss and X-ray absorption spectroscopy. The chemical sensitivity and local order probing from core-loss edges provide new insight in the undertanding of structural modifications induced under irradiation. From the analysis of the C K energy loss near edge structure (ELNES) and Al K X-ray absorption near edge structure (XANES) by ab initio calculations, the influence of the layered structure of this compound on the irradiation damage is demonstrated, with preferentialy localized damage in aluminum planes of the structure. On the basis of comparisons between calculations and the experimental spectra, a strutural model is proposed for the irradiated state. This study emphasizes the utility of core-loss fine structure analysis to further understanding of ion irradiation induced damage in complex crystalline materials.

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Section: Evolution As a Function Of The Irradiation Dosesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Contribution of core-loss fine structures to the characterization of ion irradiation damages in the nanolaminated ceramic Ti3AlC2

et al. 2013

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“…When the platelets grow continuously, the adjacent platelets may link up to each other as do spherical ones. 8 As a result, string-like He bubbles can also form, as found experimentally.…”

Section: Resultsmentioning

confidence: 62%

“…9,10 This is drastically different from the experimental observations of Ti 3 AlC 2 after He irradiation, where platelet or string-like He bubbles are also formed. 8,11 To reveal how He bubbles evolve in Ti 3 AlC 2 and understand the influence of He bubbles on its structural evolution, additional calculations of the Ti 3 AlC 2 structures with both He atoms and vacancies are carried out in this work. As mentioned before, Al and C vacancies can be readily formed in Ti 3 AlC 2 .…”

Section: Resultsmentioning

confidence: 99%

New insight into the helium-induced damage in MAX phase Ti3AlC2 by first-principles studies

Bai

Zha

et al. 2015

The Journal of Chemical Physics

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In the present work, the behavior of He in the MAX phase Ti 3 AlC 2 material is investigated using first-principle methods. It is found that, according to the predicted formation energies, a single He atom favors residing near the Al plane in Ti 3 AlC 2 . The results also show that Al vacancies are better able to trap He atoms than either Ti or C vacancies. The formation energies for the secondary vacancy defects near an Al vacancy or a C vacancy are strongly influenced by He impurity content. According to the present results, the existence of trapped He atoms in primary Al vacancy can promote secondary vacancy formation and the He bubble trapped by Al vacancies has a higher tendency to grow in the Al plane of Ti 3 AlC 2 . The diffusion of He in Ti 3 AlC 2 is also investigated. The energy barriers are approximately 2.980 eV and 0.294 eV along the c-axis and in the ab plane, respectively, which means that He atoms exhibit faster migration parallel to the Al plane. Hence, the formation of platelet-like bubbles nucleated from the Al vacancies is favored both energetically and kinetically. Our calculations also show that the conventional spherical bubbles may be originated from He atoms trapped by C vacancies. Taken together, these results are able to explain the observed formation of bubbles in various shapes in recent experiments. This study is expected to provide new insight into the behaviors of MAX phases under irradiation from electronic structure level in order to improve the design of MAX phase based materials. C 2015 AIP Publishing LLC. [http://dx

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“…Ti 3 SiC 2 and Ti 3 AlC 2 ) have been considered as better candidates for nuclear structural materials [6][7][8][9] and some experiments have demonstrated that Ti 3 AlC 2 exhibits high tolerance to the He damage. [10][11][12] For example, Wang et al reported that Ti 3 AlC 2 irradiated by 50 keV He ions with doses up to 1 Â 10 18 cm À2 at room temperature displayed severe structural disorder but no evident amorphization. 11 Patel et al demonstrated that the Al layer of Ti 3 AlC 2 at 500 C irradiated by 200 keV He ions with doses of 2 Â 10 17 cm À2 was disordered, whereas the Ti 3 C 2 layers remained intact aer irradiation.…”

Section: Introductionmentioning

confidence: 99%

The effects of He clusters on the mechanical properties of Ti₃AC₂ (A = Ge, Si): first-principles studies

et al. 2017

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Herein, the damage to the mechanical properties of Ti 3 AC 2 (A ¼ Ge, Si) was systematically investigated by first-principles calculations. It is known that the interstitial He atoms homogenously generated in the materials would finally migrate to the A layer and form clusters of no more than 7 He atoms at a monovacancy in the A layer, and the cluster of 7 He atoms reduces the ideal tensile strength of Ti 3 SiC 2 (or Ti 3 GeC 2 ) to about 37.3% (or 35.5%). The strain simulations showed that the fracture would mostly occur around the A layer and enhances with increase in the cluster size, while the Ti 3 C 2 blocks are relatively stable during tension. Although the He damage to the mechanical properties shows the similar trend for Ti 3 SiC 2 and Ti 3 GeC 2 , the former displays better properties for applications in nuclear structural devices.

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Effects of He irradiation on Ti3AlC2: Damage evolution and behavior of He bubbles

Cited by 67 publications

References 20 publications

Contribution of core-loss fine structures to the characterization of ion irradiation damages in the nanolaminated ceramic Ti3AlC2

Contribution of core-loss fine structures to the characterization of ion irradiation damages in the nanolaminated ceramic Ti3AlC2

New insight into the helium-induced damage in MAX phase Ti3AlC2 by first-principles studies

The effects of He clusters on the mechanical properties of Ti₃AC₂ (A = Ge, Si): first-principles studies

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Effects of He irradiation on Ti3AlC2: Damage evolution and behavior of He bubbles

Cited by 67 publications

References 20 publications

Contribution of core-loss fine structures to the characterization of ion irradiation damages in the nanolaminated ceramic Ti3AlC2

Contribution of core-loss fine structures to the characterization of ion irradiation damages in the nanolaminated ceramic Ti3AlC2

New insight into the helium-induced damage in MAX phase Ti3AlC2 by first-principles studies

The effects of He clusters on the mechanical properties of Ti3AC2 (A = Ge, Si): first-principles studies

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The effects of He clusters on the mechanical properties of Ti₃AC₂ (A = Ge, Si): first-principles studies