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Sub-grain scale elastic and plastic deformations in polycrystalline metallic alloys assessed via digital image correlation techniques

By Jean-Charles Stinville, Damien Texier, Nicolas Vanderesse, Florent Bridier, Jia Liu, Philippe Bocher, McLean P. Echlin, Patrick G. Callahan and Tresa M. Pollock


International audienceHigh resolution scanning electron microscopy (HR-SEM) and laser scanning confocal microscopy (HR-LSCM) digital image correlation (DIC) techniques were investigated for assessing strain distribution within individual grains during deformation in the macroscopic elastic and plastic regime. The anisotropic response of a Ni-based polycrystalline superalloy was experimentally demonstrated at the grain scale. Local plastic strain localization within preferentially oriented grains was documented under loading as low as 80% of the macroscopic yield strength of the material. Intense strains along bands were observed in the macroscopic plastic regime, correlating with {111}[1-10] slip systems

Topics: In situ tensile testing, Crystal plasticity, Strain localization mechanisms, Strain localization, Digital image correlation technique, Digital image correlation, Digital image correlation DIC, Digital image correlation method, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics []/Mechanics of materials [physics.class-ph], [SPI.MAT]Engineering Sciences [physics]/Materials
Publisher: HAL CCSD
Year: 2018
OAI identifier: oai:HAL:hal-01825043v1
Provided by: HAL-INSA Toulouse
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