A. Yabuuchi , Z.H. Zhong , K. Yasunaga , H. Watanabe , M. Tokitani , Q. Xu
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引用次数: 0
摘要
本研究调查了基于钴铬镍中熵合金（MEA）的高熵合金（HEA）--(CoCrFeNi)95Ti1Nb1Al3的抗辐照性能。在 673 K 和 873 K 下，用 2.4 MeV Ni 离子对 HEA 和 MEA 薄膜样品进行 1.7 × 1019 离子/m2 的辐照。与 MEA 相比，在 873 K 下辐照后，有沉淀的老化 HEA 和无沉淀的未老化 HEA 中未观察到明显的溶液元素偏析。此外，由于在 673 和 873 K 下受到离子辐照，堆积断层四面体（SFTs）（一种空位簇）在 HEA 中的形成明显减少。HEA 中 SFT 的形成是由于离子辐照造成的级联损伤。然而，MEA 中 SFT 的形成不仅是由于级联，还由于空位的聚集。基于速率理论模拟的结果表明，HEA 中的纳米级和亚纳米级沉淀物是空位的汇，抑制了空位的长程扩散，阻止了空位簇的形成和溶液元素的偏析。
Effects of precipitates on defect formation and irradiation resistance in CoCrFeNi alloy
In this study, the irradiation resistance of a high-entropy alloy (HEA), (CoCrFeNi)95Ti1Nb1Al3, which is based on a CoCrFeNi medium-entropy alloy (MEA), was investigated. Thin-film samples of HEA and MEA were irradiated by 2.4 MeV Ni ions to 1.7 × 1019 ions/m2 at 673 and 873 K. Compared to MEA, no significant segregation of solution elements was observed in the aged HEA with precipitation and the unaged HEA without precipitation after irradiation at 873 K. Thus, the irradiation resistance of the HEA was improved. In addition, the formation of stacking fault tetrahedra (SFTs), a type of vacancy cluster, owing to ion irradiation at 673 and 873 K, was significantly reduced in the HEA. The formation of SFTs in HEA is due to the cascade damage caused by ion irradiation. However, the formation of SFTs in MEA is not only due to a cascade, but also due to the aggregation of vacancies. The results based on rate theory simulations show that nano-sized and sub-nano-sized precipitates in HEA act as sinks for vacancies and inhibit the long-range diffusion of vacancies, preventing vacancy cluster formation and the segregation of solution elements.
期刊介绍：
Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.
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