About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Deformation-induced Microstructural Evolution during Solid Phase Processing: Experimental and Computational Studies
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Presentation Title |
Twinning Behaviour Affected by Lowering Basal Stacking Fault Energy in Ti-10 at.%Al Alloy |
Author(s) |
Wenqian Wu, Bingqiang Wei, Mingyu Gong, Jian Wang |
On-Site Speaker (Planned) |
Wenqian Wu |
Abstract Scope |
Deformation twinning in hexagonal metals accommodates plastic deformation but results in strong plastic anisotropy and low ductility because of the localized and unidirectional shear deformation. Modifying twinning behaviour could tailor mechanical behaviour of hexagonal metals. In this work, we demonstrated that lowering basal stacking fault energy in Ti-10at.%Al alloy can promote the formation of profuse basal stacking faults (BSFs) and FCC nanobands, which effectively inhibit propagation and growth of deformation twins. Density functional theory calculations examined that Al solutes can reduce basal stacking faults energy and phase energy difference between HCP and FCC phases. Based on microscopy characterizations and atomistic simulations, we rationalized the influence of lowering basal stacking fault energy (SFE) on twinning behaviours and proposed a self-pinning mechanism of twinning. The present work provides new strategy to modify twining behaviour by adjusting basal SFE in Ti alloys and other HCP metals. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Characterization, Titanium |