Core structure of a<100> interfacial superdislocations in a nickel-base superalloy during high-temperature and low-stress creep

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• 作者：Xianzi Lv ; Jianxin Zhang ; ^{jianxin@sdu.edu.cn}
• 关键词：Nickel-base superalloy ; Dislocation dipole ; HRTEM ; A< ; 100> ; superdislocation ; Creep deformation
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：23 January 2017
• 年：2017
• 卷：683
• 期：Complete
• 页码：9-14
• 全文大小：1374 K
• 卷排序：683

文摘

Dislocation substructures were investigated in a nickel-base single crystal superalloy subjected to 85 h creep at 1100 °C and 130 MPa using conventional and high resolution transmission electron microscopy. Both hexagonal and square-like interfacial dislocation networks were observed. The square-like networks, which were caused by two perpendicular sets of a/2<110> dislocations forming a[100] superdislocations, were tested. It was concluded that the a[100] interfacial dislocation occurred in the form of a dislocation dipole. The creation and destruction of dislocation dipoles proceeded reversibly via a slip-and-climb mechanism.