In-situ TEM study of irradiation-induced damage mechanisms in monoclinic-ZrO2
In-situ TEM study of irradiation-induced damage mechanisms in monoclinic-ZrO2
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DOI：
10.1016/j.actamat.2020.08.064
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发表时间：
2020-10-15
期刊：
影响因子：
9.4
通讯作者：
Grovenor, Chris R. M.
中科院分区：
文献类型：
--
作者：
Liu, Junliang;Mir, Anamul Haq;Grovenor, Chris R. M.
我们已经调查了重离子辐照下，使用原位透射电子显微镜（TEM）的纳米氧化锆的微观结构和晶体学的演变，并研究了原子结构的缺陷团簇，使用像差校正的扫描透射电子显微镜（STEM）。在重离子辐照下，观察到单斜氧化锆转变成立方相，稳定的辐射诱导的缺陷团簇引起的应变。我们认为，单斜-立方相变本质上是马氏体相变，取向关系为（100）（m）平行于（100）（c），[001]（m）平行于[001]（c）。提出了一个空洞形成的模型，考虑到缺陷的相互作用。该研究还表明，高分辨率的取向映射的透射菊池衍射（TKD）结合在TEM中的原位辐照是一个强大的方法来探测的机制控制辐照诱导过程，包括晶界迁移，相变和织构演化。(C)2020 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
We have investigated the microstructural and crystallographic evolution of nanocrystalline zirconia under heavy ion irradiation using in-situ transmission electron microscopy (TEM) and have studied the atomic configurations of defect clusters using aberration-corrected scanning transmission electron microscopy (STEM). Under heavy ion irradiation the monoclinic-ZrO2 is observed to transform into cubic phase, stabilised by the strain induced by irradiation-induced defect clusters. We suggest that the monoclinic-to-cubic transformation is martensitic in nature with an orientation relationship identified to be (100)(m)parallel to(100)(c) and [001](m)parallel to [001](c), By increasing the damage dose, both the formation of voids and irradiation-induced grain growth were observed. A model for the formation of voids is proposed, taking defect interactions into consideration. The study has also demonstrated that high resolution orientation mapping by transmission Kikuchi diffraction (TKD) combined with in-situ irradiation in a TEM is a powerful method to probe the mechanisms controlling irradiation-induced processes, including grain boundary migration, phase transformations and texture evolution. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.