期刊
ACTA MATERIALIA
卷 57, 期 7, 页码 2266-2276出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.01.027
关键词
Thermal mechanical fatigue; Deformation mechanisms; Twinning; Recrystallization; Single crystal superalloy
The deformation and damage mechanisms arising during thermal mechanical fatigue (TMF) of the single-crystal superalloy CMSX-4 have been investigated, both in the virgin condition and after long-term exposure at 1000 degrees C. Fundamental differences in the mechanical response due to ageing have been discovered, which are attributed to the tendency for the precipitation of topologically close-packed phases during deformation. In the virgin condition, the deformation during TMF is very localized and concentrated to twin bands which extend over the complete cross-section of the specimen; at the interception of these bands, the material is prone to recrystallization. The aged material on the other hand shows a much more dispersed deformation behaviour in which the length and thickness of the twins are much smaller and no recrystallization is found. Instead, significant local misorientations-implying crystal rotation are observed in the aged material after rupture. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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