收录:
摘要:
Here, we investigate a new type of kink structure that is found at gamma/gamma' interfaces in nickel-based single crystal superalloys. We studied these structures at the atomic and elemental level using aberration corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The core of the dislocation absorbs high-Z elements (i.e., Co and Re) that adopt hexagonal arrangements, and it extrudes elements (i.e., Ni and Al) that adopt face centered cubic (fcc) structures. High-Z elements (i.e., Ta and W) and Cr, which is a low-Z element, are stabilized in body centered cubic (bcc) arrangements; Cr tends to behave like Re. High-Z elements, which migrate and adopt a hexagonal structure, induce kink formation at gamma/gamma' interfaces. This process must be analyzed to fully understand the kinetics and dynamics of creep in nickel-based single crystal superalloys. (C) 2014 Elsevier B.V. All rights reserved.
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来源 :
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN: 0925-8388
年份: 2015
卷: 618
页码: 750-754
6 . 2 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
ESI高被引阀值:319
JCR分区:1
中科院分区:1