About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
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Presentation Title |
Understanding The Role of Coherent Nano Precipitates On Stacking Fault and Deformation Twin Formation in Wire Arc Additive Manufactured Nickel-Aluminum-Bronze |
Author(s) |
Aeriel D. Murphy-Leonard, Veronika Mázánova, Milan Heczko, Jiashi Miao |
On-Site Speaker (Planned) |
Aeriel D. Murphy-Leonard |
Abstract Scope |
The strain hardening mechanisms and dislocation interactions of a wire arc additively manufactured (WAAM) nickel-aluminum-bronze (NAB) alloy was investigated using scanning transmission electron microscopy (STEM), STEM-based energy dispersive X-ray spectroscopy and electron back scatter diffraction (EBSD). Flat, rectangular dog bone specimens were strained under uniaxial tension conditions. To understand the micro- and nanometer scale deformation mechanisms throughout the microstructure, two tensile test specimens were interrupted near the yield strength and ultimate tensile strength. STEM microstructural characterization revealed that tensile deformation occurs by planar slip and multiple slip bands interacting on different {111} planes as well as the nucleation of dislocations from interfaces associated with crystalline grains and second phase particles. Center of symmetry analysis revealed that the shearing of nanoscale precipitates led to the formation of intrinsic stacking faults and 2-layer extrinsic stacking faults. At high strain levels the stair rod cross-slip mechanism led to the formation of deformation twins. |
Proceedings Inclusion? |
Planned: |