Dislocation dynamics in a nickel-based superalloy via in-situ transmission scanning electron microscopy

被引：51
|
作者：
Stinville, J. C. [1 ]
Yao, Eric R. [1 ]
Callahan, Patrick G. [1 ]
Shin, Jungho [1 ]
Wang, Fulin [1 ]
Echlin, McLean P. [1 ]
Pollock, Tresa M. [1 ]
Gianola, Daniel S. [1 ]
机构：
[1] Univ Calif Santa Barbara, Mat Dept, Santa Barbara, CA 93106 USA
来源：
ACTA MATERIALIA | 2019年 / 168卷
关键词：
In-situ transmission scanning electron microscopy (TSEM); Nickel-based superalloy rene 88DT; Dislocations dynamic; Twin boundary; STEM detector; Plastic localization; FATIGUE-CRACK INITIATION; HIGH-CYCLE FATIGUE; STRAIN LOCALIZATION; TWIN BOUNDARIES; NI-BASE; INTERMEDIATE; DEFORMATION; BEHAVIOR; CREEP; EBSD;
D O I：
10.1016/j.actamat.2018.12.061
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Micro-tensile specimens of nickel-based superalloy oligocrystals were tested in-situ in an scanning electron microscope in transmission mode (TSEM) enabling observation of dislocations. The dynamics of dislocation motion during tensile loading were captured and correlated with the measured intermittencies during plastic flow recorded by high load- and temporal-resolution sensors. This investigation in particular focused on the dislocation behavior near twin boundaries with different slip configurations. A multiplicity of deformation mechanisms at the dislocation scale were observed within individual slip bands, including precipitate shearing, dislocation decorrelation and antiphase boundary coupled shearing. These processes affect strain localization near twin boundaries and provide new defect-level insights on plastic localization and fatigue crack initiation in these alloys. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：152 / 166
页数：15
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