Abstract Irradiation-induced void swelling remains a major challenge to nuclear reactor operation. Swelling may take years to initiate and often results in rapid material property degradation once started. Alloy development for advanced nuclear systems will require rapid characterization of the swelling breakaway dose in new alloys, yet this capability does not yet exist. We demonstrate that transient grating spectroscopy (TGS) can detect void swelling in single crystal copper via changes in surface acoustic wave (SAW) velocity. Scanning transmission electron microscopy (STEM) links the TGS-observed changes with void swelling-induced microstructural evolution. These results are considered in the context of previous work to suggest that in situ TGS will be able to rapidly determine when new bulk materials begin void swelling, shortening alloy development and testing times.

中文翻译：

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使用瞬态光栅光谱法检测纯铜中自离子辐射引起的空洞膨胀

摘要 辐照引起的空隙膨胀仍然是核反应堆运行的主要挑战。溶胀可能需要数年时间才能开始，而且一旦开始，通常会导致材料性能迅速下降。先进核系统的合金开发将需要快速表征新合金中的膨胀脱离剂量，但这种能力尚不存在。我们证明瞬态光栅光谱 (TGS) 可以通过表面声波 (SAW) 速度的变化检测单晶铜中的空隙膨胀。扫描透射电子显微镜 (STEM) 将 TGS 观察到的变化与空隙膨胀引起的微观结构演变联系起来。这些结果在先前工作的背景下被考虑，表明原位 TGS 将能够快速确定新的散装材料何时开始空隙膨胀，