Abstract
This work investigates the anisotropic mechanical behavior (both macro and micro) of Al6061 alloy samples manufactured using ultrasonic additive manufacturing. Samples from both sonotrode travel and vibration directions (TD and VD, respectively) were investigated in the as-built and aged (8 h at 180 °C under Argon gas) conditions. The aged VD-specimens showed appearance and propagation of Luders-like band, which did not exist in the TD-specimens, deformed at the same strain rate. X-ray diffraction, x-ray computed tomography, scanning electron microscopy, laser flash technique and in-situ loading with neutron diffraction were used to characterize the material and its hardening behavior during straining. Aging was mainly found to lead to relaxation of stresses, induced by the build process, some decrease in yield stress, and potential secondary phase reprecipitation. Stress partitioning, revealed via in situ neutron diffraction, showed that one of grain families, (110) || tensile axis, revealed strain softening at small strain range. This texture component, (110) || tensile axis, dominated the structure of VD-specimens, and was one of key factors stimulating band appearance and propagation.
Original language | English |
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Article number | 138533 |
Journal | Materials Science and Engineering: A |
Volume | 770 |
DOIs | |
State | Published - Jan 7 2020 |
Funding
A portion of this research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U. S. Department of Energy. The research at ORNL's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. A portion of this research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory , managed by UT-Battelle, LLC, for the U. S. Department of Energy. The research at ORNL's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy .
Keywords
- Aluminum alloys
- Electron microscopy
- Micromechanics
- Plasticity
- Stress/strain measurements
- X-ray analysis