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arXiv 2008.05468cond-mat.mtrl-sci
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辐照Ti3SiC2中的氦效应和气泡形成

Helium effects and bubbles formation in irradiated Ti3SiC2

Hongliang Zhang, Ranran Su, Izabela Szlufarska, Liqun Shi, Haiming Wen

摘要:

Ti_3SiC_2是一种潜在的核反应堆结构材料。然而,这种材料中的He辐照效应还没有得到很好的理解,特别是在高温下。在这里,我们比较了室温(RT)和750 °C下He辐照对Ti3SiC2的影响。发现在750 °C下的辐照导致极其细长的He气泡,其集中在Ti3SiC2的纳米层压层中,而材料的整体晶体结构保持完整。相反,在室温下,层状结构被显着损坏和高度无序照射后。我们的研究表明,在高温下,Ti3SiC2的独特结构可以在纳米层压层中容纳大量的He原子,而不会影响材料的结构稳定性。结构和力学性能测试结果表明,在750 °C下辐照引起的膨胀和硬化比室温下的小得多。这些结果表明,Ti3SiC2具有优异的抗辐照引起的He杂质积累的能力,并且在高温下对辐照引起的力学性能退化具有相当大的耐受性。

英文摘要:

Ti3SiC2 is a potential structural material for nuclear reactor applications. However, He irradiation effects in this material are not well understood, especially at high temperatures. Here, we compare the effects of He irradiation in Ti3SiC2 at room temperature (RT) and at 750 °C. Irradiation at 750 °C was found to lead to extremely elongated He bubbles that are concentrated in the nano-laminate layers of Ti3SiC2, whereas the overall crystal structure of the material remained intact. In contrast, at RT, the layered structure was significantly damaged and highly disordered after irradiation. Our study reveals that at elevated temperatures, the unique structure of Ti3SiC2 can accommodate large amounts of He atoms in the nano-laminate layer, without compromising the structural stability of the material. The structure and the mechanical tests results show that the irradiation induced swelling and hardening at 750 °C are much smaller than those at RT. These results indicate that Ti3SiC2 has an excellent resistance to accumulation of radiation-induced He impurities and that it has a considerable tolerance to irradiation-induced degradation of mechanical properties at high temperatures.

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