Multiple mechanisms of lath martensite plasticity

The multi-scale complexity of lath martensitic microstructures requires scale-bridging analyses to better understand the deformation mechanisms activated therein. In this study, plasticity in lath martensite is investigated by multi-field mapping of deformation-induced microstructure, topography, an...

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Bibliographic Details
Published in:Acta materialia 2016-12, Vol.121, p.202-214
Main Authors: Morsdorf, L., Jeannin, O., Barbier, D., Mitsuhara, M., Raabe, D., Tasan, C.C.
Format: Article
Language:English
Subjects:
Accommodation
Austenite
Boundaries
Deformation mechanisms
DIC
Dislocations
EBSD
Martensite
Micro-mechanics
Microstructure
Plasticity
Strain mapping
Topography
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Summary:The multi-scale complexity of lath martensitic microstructures requires scale-bridging analyses to better understand the deformation mechanisms activated therein. In this study, plasticity in lath martensite is investigated by multi-field mapping of deformation-induced microstructure, topography, and strain evolution at different spatial resolution vs. field-of-view combinations. These investigations reveal site-specific initiation of dislocation activity within laths, as well as significant plastic accommodation in the vicinity of high angle block and packet boundaries. The observation of interface plasticity raises several questions regarding the role of thin inter-lath austenite films. Thus, accompanying transmission electron microscopy and synchrotron x-ray diffraction experiments are carried out to investigate the stability of these films to mechanical loading, and to discuss alternative boundary sliding mechanisms to explain the observed interface strain localization. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2016.09.006