TEM Study on Hydrogen-Induced Cracking of Fe_3Al Alloy

作     者：Biao Gu, Lijie Qiao, Wuyang Chu Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 

作者机构：Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2001年第8卷第1期

页      面：35-38页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：TEM Fe3Al intermetallics hydrogen induced cracking dislocation emission dislocation free zone 

摘      要：Hydrogen-induced cracking (HIC) of Fe3Al alloy was studied by in situ transmission electron microscope (TEM). Electron transparent specimens were mounted onto a constant displacement device. Stress was applied to the specimen by using a bolt through the device. The results showed that hydrogen enhanced the dislocation emission and motion in Fe3Al alloy. A dislocation free zone (DFZ) was formed following the dislocation emission. Microcrack initiated in the DFZ or at the main crack tip when the emission reached a critical extension. Hydrogen played an important role in the process of brittle fracture of Fe3Al alloy.