Interface nucleation rate limited densification during sintering
Interface nucleation rate limited densification during sintering
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DOI：
10.1016/j.actamat.2022.118448
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发表时间：
2022-10
期刊：
影响因子：
9.4
通讯作者：
S. Dillon;Yonghui Ma;J. Oyang;D. Coffman;Omar Hussein;K. Hattar;F. Abdeljawad
中科院分区：
文献类型：
--
作者：
S. Dillon;Yonghui Ma;J. Oyang;D. Coffman;Omar Hussein;K. Hattar;F. Abdeljawad
在原位双晶烧结实验中进行的透射电子显微镜表明，致密化速率可以遵循界面形核速率限制动力学。这项工作进行原位烧结实验上不混溶的Al 2 O3-GdAlO 3接口，使一个单一的界面类型的烧结作为时间和温度的函数的统计处理。这些数据提供了成核过程的活化能的量度，为4.8 eV。这个大值与该过程是速率限制的观察结果一致。一个新的烧结模型的基础上开发的界面形核速率限制动力学的假设，并证明工作良好的预测原位双晶烧结数据，拟合原位多颗粒烧结数据，预测晶粒尺寸与密度的烧结轨迹，并拟合等温块体烧结数据。
In situbicrystal sintering experiments performed in a transmission electron microscope indicate that the densification rate can follow interface nucleation rate limited kinetics. This work performs in situ sintering experiments on immiscible Al2O3-GdAlO3interfaces enabling a statistical treatment of sintering at a single interface type as a function of time and temperature. The data provide a measure for the activation energy of the nucleation process, ≈4.8 eV. This large value is consistent with observations that the process is rate limiting. A new sintering model is developed based on the assumption of interface nucleation rate limited kinetics and is demonstrated to work well in predicting in situ bicrystal sintering data, fitting in situ multiparticle sintering data, predicting grain size versus density sintering trajectories, and fitting isothermal bulk sintering data.