论文标题
与最大相比较的MAB相的缺陷行为和辐射耐受性
Defect behavior and radiation tolerance of MAB phases (MoAlB and Fe2AlB2) with comparison to MAX phases
论文作者
论文摘要
mAB相是一类新的分层三元材料，它们已经显示出许多出色的特性。在这里，我们使用实验表征和第一原理计算的组合研究了两个moalb和fe2alb2的两个MAB相的缺陷进化和辐射耐受性。我们发现，在150°C和300°C下，FE2ALB2比Moalb更容易宽容辐射诱导的非晶化。结果可以通过以下事实来解释，即Mo Frenkel对在Moalb中是不稳定的，因此，预期的Moalb有望具有大量浓度的MOAL镇静，即使在300°C下也很难退化。我们发现，对辐射诱导的mAb相的耐受性低于最大相，但与SIC相当。但是，mAb相并未显示辐射诱导的裂纹，这在相同的辐照条件下在最大相中观察到。这项研究表明，mAB相可能是涉及辐射的应用的有前途的材料类别。
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 Fe2AlB2 is more tolerant to radiation-induced amorphization than MoAlB, both at 150 °C and at 300 °C. 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 °C. 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.
