Microstructural Characterization and Simulation of High Temperature Inelastic Deformation and Fracture of Al-Li 2070

A combined experimental and simulation investigation is carried out to characterize the high temperature deformation behavior of a recently developed Al-Li alloy, AA2070, over a temperature range including typical forging temperatures. Focus is placed on providing explanations for the temperature-de...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2019-11, Vol.28 (11), p.6942-6957
Main Authors: Staroselsky, A., Borkowski, L.
Format: Article
Language:English
Subjects:
ALLOYS
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
CRYSTAL LATTICES
CRYSTALLIZATION
ELONGATION
Engineering Design
FRACTURES
MATERIALS SCIENCE
MICROSTRUCTURE
PLASTICITY
Quality Control
Reliability
Safety and Risk
SIMULATION
TEMPERATURE DEPENDENCE
Tribology
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Description
Summary:A combined experimental and simulation investigation is carried out to characterize the high temperature deformation behavior of a recently developed Al-Li alloy, AA2070, over a temperature range including typical forging temperatures. Focus is placed on providing explanations for the temperature-dependent plastic and fracture behavior observed for this material using macroscale tensile tests, microscale imaging and analysis, and physics-based micromechanical modeling. It is shown that AA2070 experiences non-monotonic elongation to failure with a rise in temperature. Detailed fractography and microstructural analysis, including dynamic recrystallization analysis, provide insight into this interesting and practically useful behavior. In addition, a validated crystal plasticity model is called upon to explain the unique texture observed in the necked region of the ductile tensile specimen. The insights provided by this investigation will allow improved design of high temperature forming operations for AA2070 and similar alloys which can extend the application of third generation Al-Li alloys.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-019-04406-3