Abstract We demonstrate the sensitivity of complexion time-temperature-transformation (TTT)-diagrams to composition and grain size in Eu-doped MgAl2O4. 100 ppm and 500 ppm Eu-doped MgAl2O4 undergo the same complexion transition, which causes abnormal grain growth, but exhibit different nucleation and grain growth rates. The Eu content per grain boundary area (Eu/GBA) was calculated for various heat treatments using a simple model based on average grain size. Despite their differences, a common Eu/GBA is calculated at the onset of abnormal grain growth. This common grain boundary excess has important implications for complexion TTT-diagrams and provides a new metric for predicting abnormal grain growth.

中文翻译：

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晶界面积对掺铕铝酸镁尖晶石络合时间-温度-转变图的影响

摘要 我们证明了肤色时间-温度-转变 (TTT) 图对 Eu 掺杂的 MgAl2O4 中的成分和晶粒尺寸的敏感性。100 ppm 和 500 ppm Eu 掺杂的 MgAl2O4 经历相同的颜色转变，导致异常晶粒生长，但表现出不同的成核和晶粒生长速率。使用基于平均晶粒尺寸的简单模型，针对各种热处理计算每晶界面积的 Eu 含量 (Eu/GBA)。尽管存在差异，但在异常晶粒生长开始时计算出共同的 Eu/GBA。这种常见的晶界过剩对肤色 TTT 图具有重要意义，并为预测异常晶粒生长提供了新的度量标准。