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Ti_3(Si,Al)C_2 FOR NUCLEAR APPLICATION: INVESTIGATION OF IRRADIATION EFFECTS INDUCED BY CHARGED PARTICLES

机译:用于核应用的Ti_3(Si,Al)C_2:带电粒子引起的辐照效应的研究

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摘要

In the frame of material development for the future nuclear reactors, MAX phases, especially Ti_3SiC_2-based materials have been recently considered as candidate for the core components in Gas Fast Reactors because of good thermal conductivity, neutron transparency and tolerance to damage. Nevertheless, their behaviour under irradiation has never been investigated until now (including the change in the lamellar microstructure and then a possible loss of the damage tolerance properties). In parallel to progressing neutron irradiations, CEA launched in 2006 irradiations with charged particles of high kinetic energy to precise the evolution of several Ti_3SiC_2 grades. In this work, Ti.3(Si,Al)C_2 fabricated by hot-pressing method were irradiated with Kr and Xe ions at 20℃ and 500℃. This allowed to explore both the influence of electronic (near surface) and nuclear (implantation zone) interaction in the same experiment. The effect of dose and temperature on the microstructure and hardness was investigated. No change in hardness or microstructure was detected up to 10~(13) ions/cm~2. Higher doses induced hardness increase, but damage tolerance remained. This hardening should be correlated to atomic disorder and cell change highlighted by TEM and XRD. Annealing of the irradiation defects with temperature was highlighted and would start at 300℃. The formation of β-Ti_3(Si,Al)C_2 under irradiation is suggested.
机译:在未来核反应堆的材料开发框架中,由于具有良好的导热性,中子透明性和耐破坏性,最近已考虑将MAX相,尤其是Ti_3SiC_2基材料作为快气反应堆核心组件的候选材料。然而,迄今为止,尚未研究过它们在辐射下的行为(包括层状微结构的变化,进而可能导致破坏耐受性能的损失)。在进行中子辐照的同时,CEA于2006年启动了对辐照的,具有高动能的带电粒子的辐照,以精确地演化出几种Ti_3SiC_2等级。本文通过热压法制备的Ti.3(Si,Al)C_2在20℃和500℃分别用Kr和Xe离子辐照。这允许在同一实验中探索电子(近表面)和核(植入区)相互作用的影响。研究了剂量和温度对显微组织和硬度的影响。直至10〜(13)离子/ cm〜2,均未检测到硬度或微观结构的变化。更高的剂量会导致硬度增加,但仍能保持损伤耐受性。这种硬化应与原子序紊乱和TEM和XRD突出显示的细胞变化有关。着重指出了随温度的辐照缺陷退火,退火温度应从300℃开始。建议在辐射下形成β-Ti_3(Si,Al)C_2。

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