- Title
- Defect behavior and radiation tolerance of MAB phases (MoAlB and Fe2AlB2) with comparison to MAX phases
- Creator
- Zhang, Hongliang; Kim, Jun Young; Su, Ranran; Richardson, Peter; Xi, Jianqi; Kisi, Erich; O'Connor, John; Shi, Liqun; Szlufarska, Izabela
- Relation
- Acta Materialia Vol. 196, Issue 1 September 2020, p. 505-515
- Publisher Link
- http://dx.doi.org/10.1016/j.actamat.2020.07.002
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2020
- Description
- MAB phases are a new class of layered ternary materials that have already shown a number of outstanding properties. Here, we investigate defect evolution and radiation tolerance of two MAB phases, MoAlB and Fe2AlB2, using a combination of experimental characterization and first-principles calculations. We find that Fe2,AlB2 is more tolerant to radiation-induced amorphization than MoAlB, both at 150 ℃ and at 300 ℃. The results can be explained by the fact that the Mo Frenkel pair is unstable in MoAlB and as a result, irradiated MoAlB is expected to have a significant concentration of MoAl antisites, which are difficult to anneal even at 300 ℃. We find that the tolerance to radiation-induced amorphization of MAB phases is lower than in MAX phases, but it is comparable to that of SiC. However, MAB phases do not show radiation-induced cracking which is observed in MAX phases under the same irradiation conditions. This study suggests that MAB phases might be a promising class of materials for applications that involve radiation.
- Subject
- MAB phases; MAX phases; radiation; TEM; defects; DFT
- Identifier
- http://hdl.handle.net/1959.13/1432663
- Identifier
- uon:39087
- Identifier
- ISSN:1359-6454
- Language
- eng
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