About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Short-range Ordering Mechanics in FCC Materials |
Author(s) |
Daegun You, Orcun Koray Celebi, Ahmed Sameer Khan Mohammed, Gorkem Gengor, Huseyin Sehitoglu |
On-Site Speaker (Planned) |
Daegun You |
Abstract Scope |
Short-range order (SRO) has a crucial impact on the mechanical strength of metallic alloys. Recent atomistic investigations defined an average SRO and attempted to correlate it with the yield strength. We propose that the local change in SRO upon slip advance must dictate the strengthening, and we elaborate the methodology to establish the SRO-change on a slip plane considering the Wigner-Seitz cell. The model captures variation of lattice resistance (CRSS) in the crystal as the SRO changes depending on the probability of neighboring atoms. The methodology was applied to Ni-V binary alloys for a wide range of compositions and stacking fault widths. Dislocation core-widths were determined as a function of SRO and energy parameters (γus, γisf). CRSS with compositional variations shows good agreement with limited experimental results. The compositions corresponding to transition from partial to full dislocations at higher vanadium contents are found depending on SRO and intrinsic energy levels. |
Proceedings Inclusion? |
Planned: |