ABSTRACT The aim of this work is to investigate quench induced precipitation during continuous cooling in aluminium wrought alloys EN AW-7150 and EN AW-6082 using in situ synchrotron wide-angle X-ray scattering (WAXS). While X-ray diffraction is usually an ex situ method, a variety of diffraction patterns were recorded during the cooling process, allowing in situ analysis of the precipitation process. The high beam energy of about 100 keV allows the beam to penetrate a bulk sample with a 4 mm diameter in a quenching dilatometer. Additionally, the high intensity of a synchrotron source enables sufficiently high time resolution for fast in situ cooling experiments. Reaction peaks could be detected and compared with results from differential scanning calorimetry (DSC) by this method. A methodology is presented in this paper to evaluate WAXS data in a way that is directly comparable to DSC-experiments. The results show a high correlation between both techniques, DSC and WAXS, and can significantly improve continuous cooling precipitation diagrams.

中文翻译：

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用广角 X 射线散射原位分析铝合金中的连续冷却沉淀

摘要 这项工作的目的是使用原位同步加速器广角 X 射线散射 (WAXS) 研究铝锻合金 EN AW-7150 和 EN AW-6082 在连续冷却过程中的淬火诱导沉淀。虽然 X 射线衍射通常是一种非原位方法，但在冷却过程中记录了各种衍射图，从而可以对沉淀过程进行原位分析。约 100 keV 的高光束能量允许光束穿透淬火膨胀仪中直径为 4 mm 的大块样品。此外，同步加速器源的高强度为快速原位冷却实验提供了足够高的时间分辨率。通过这种方法可以检测反应峰并与差示扫描量热法 (DSC) 的结果进行比较。本文提出了一种方法，以与 DSC 实验直接比较的方式评估 WAXS 数据。结果表明，DSC 和 WAXS 这两种技术之间具有高度相关性，并且可以显着改善连续冷却沉淀图。