The effect of sink strength on helium bubble formation at elevated temperatures

Nuclear Analysis Pub Date : 2022-03-01 DOI:10.1016/j.nucana.2022.100003

Zhanfeng Yan , Yanru Lin

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引用次数: 2

Abstract

In present study, the model Fe–9Cr alloy and two nanostructured ferritic alloys (NFAs) CNA1 and 9YWTV with high application potential in advanced nuclear power systems were selected to systematically investigate the effect of sink strength on helium bubble behavior at elevated temperatures. Helium bubble formation for a constant implanted He concentration of ∼7500 atomic parts per million (appm) was characterized using transmission electron microscopy (TEM) at 500 and 700 °C. A quantitative research and comparison of the influence for a specific sink strength on bubble formation was illustrated. Results showed that the introduction of nanoparticles into NFAs can effectively reduce bubble coarsening by sequestering the implanted helium into dispersed small bubbles due to the sufficient He entrapment by interfaces between the nanoprecipitates and the surrounding matrix. In addition, the NFAs with higher sink strength (9YWTV) revealed a higher suppression effects on bubble growth compared to general particle-free Fe–9Cr alloy and CNA1 with lower sink strength. This can be attributed to the comparable mean free path of He diffusion with the inter-particle distance for high particle density in 9YWTV. Meanwhile, the suppression effects of sinks on bubble growth decreased with increasing temperature from 500 to 700 °C. The sink strength of the order of 10¹⁵ m⁻² and 10¹⁶ m⁻² showed favorable suppression effect on bubble coarsening at 500 °C and 700 °C, respectively.

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沉降强度对高温下氦泡形成的影响

本研究选择Fe-9Cr模型合金和两种在先进核电系统中具有较大应用潜力的纳米结构铁素体合金(nfa) CNA1和9YWTV，系统研究了熔池强度对高温下氦泡行为的影响。在500°C和700°C下，用透射电子显微镜(TEM)研究了恒定注入He浓度为~ 7500原子份/百万分之一(appm)时氦泡的形成。定量研究和比较了特定沉降强度对气泡形成的影响。结果表明，纳米颗粒的引入可以有效地减少气泡的粗化，因为纳米颗粒与周围基体之间的界面具有足够的He包被，从而将注入的氦隔离到分散的小气泡中。此外，与一般无颗粒Fe-9Cr合金和低汇强度CNA1相比，具有较高汇强度(9YWTV)的nfa对气泡生长的抑制效果更好。这可以归因于在9YWTV中，高粒子密度时He扩散的平均自由程与粒子间距离相当。同时，在500 ~ 700℃范围内，随着温度的升高，汇对气泡生长的抑制作用逐渐减弱。在500℃和700℃时，1015 m−2和1016 m−2量级的汇强度对气泡粗化有较好的抑制作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Analysis

CiteScore

1.70

自引率

0.00%

发文量