快速评估沉淀硬化铜合金的初级辐射损伤抵抗性
Rapid Primary Radiation Damage Resistance Assessment of Precipitation-Hardened Cu Alloys
AI总结：
本研究通过原位监测技术快速评估沉淀硬化铜合金的辐射损伤抗性，利用TGS和TEM结合空位计算，实现几分钟内预测材料损伤，显著缩短传统方法所需时间。
摘要：
本研究建立了通过瞬时光栅光谱法（TGS）测量的原位辐照引起的性能变化与Cu-Cr-Ta合金中产生的微观结构损伤之间的直接相关性。通过物理气相沉积制备的薄膜被6.6 MeV的Cu+3离子辐照至25 DPA，同时TGS持续监测表面声波（SAW）频率和热扩散率的演变。辐照后透射电子显微镜（TEM）用于量化空洞形成作为累积辐射损伤的指标。在辐照开始后几秒钟内观察到SAW频率显著下降，并发现其与最终空洞密度有很强的相关性。空位MEB计算表明，SAW频率的微小下降与移动空位的低人口有关，促进缺陷重组并减少空洞形成。这种关系使可以在辐照几分钟内预测相对辐射损伤抗性，相比传统辐照和后处理方法大幅减少所需时间，允许快速筛选多种成分。我们能够用此方法测试了Cu-Cr-Ta系统的三种成分。更一般而言，这种原位方法为加速开发辐射环境下的材料提供了高效途径。
英文摘要：
This study establishes a direct correlation between in situ irradiation-induced property changes measured by transient grating spectroscopy (TGS) and the resulting microstructural damage in Cu-Cr-Ta alloys. Thin films fabricated by physical vapor deposition were irradiated with 6.6 MeV Cu +3 ions up to 25 DPA, while TGS continuously monitored the evolution of surface acoustic wave (SAW) frequency and thermal diffusivity. Post-irradiation transmission electron microscopy (TEM) was used to quantify void formation as a metric of accumulated radiation damage. A pronounced decrease in SAW frequency was observed some seconds after the onset of irradiation, and it was found to correlate strongly with the final void density. Vacancy MEB calculations propose that the small decrease in SAW frequency is associated with the low population of mobile vacancies, promoting defect recombination and decreasing void formation. This relationship enables early prediction of relative radiation damage resistance within minutes of irradiation, substantially reducing the time required compared to conventional irradiation and postcharacterization routes, allowing rapid screening of multiple compositions. We were able to test this method with 3 compositions of the Cu-Cr-Ta system. More generally, this in situ approach provides an efficient pathway for accelerating the development of materials for radiation environments.
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