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Microstructure characterization and elastic-plastic self-consistent simulation studies of anisotropic deformation of β-tin

Uniaxial compression tests of 99.9% pure polycrystalline β-tin (Sn) were conducted at various strain rates (10−3/s, 10−1/s and 1/s) and temperatures (294 K and 193 K) to understand the effects of these variables on the stress–strain response, microstructure evolution, and stress relaxation behavior....

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Bibliographic Details
Published in:International journal of plasticity 2023-09, Vol.168, p.103658, Article 103658
Main Authors: Pokharel, Reeju, Clausen, Bjørn, Savage, Daniel J., Zhang, Jianzhong, Vogel, Sven C., Beal, Roberta, Valdez, James, Anghel, Veronica, Brown, Donald W., Gray, George T.
Format: Article
Language:English
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Summary:Uniaxial compression tests of 99.9% pure polycrystalline β-tin (Sn) were conducted at various strain rates (10−3/s, 10−1/s and 1/s) and temperatures (294 K and 193 K) to understand the effects of these variables on the stress–strain response, microstructure evolution, and stress relaxation behavior. Multiple Sn specimens were subjected to complex compressive loading/unloading/reloading paths at different strain rates. Specimens initially compressed at higher strain rates showed strain rate-dependent texture evolution and more pronounced relaxation upon reloading, as compared to those pre-strained at lower rates at room temperature (RT). Compression tests conducted at low temperature (193 K) revealed increased strength, similar to the enhanced strength observed when the strain rate was increased at RT. Neutron diffraction was employed to characterize the initial and final bulk textures of the RT specimens. Electron backscatter diffraction was utilized to examine the crystallographic grain orientation and morphology, thereby identifying the signatures of dislocation-mediated deformation, grain refinement, recrystallization, and twinning behaviors. Elastic-plastic self-consistent simulations were performed to investigate the deformation modes responsible for the strain rate-dependent macroscopic stress–strain response and texture evolution. Effects of crystallographic orientation on stress relaxation behavior was also examined. The model predictions are in reasonable agreement with experimental observations. [Display omitted] •The effects of strain rate and temperature on β-Sn response are studied.•Texture and local substructure were analyzed to understand microstructure evolution.•Increased strength and twinning operative at high strain rates and low temperatures.•EPSC simulations were used to predict texture evolution and stress-relaxation.•Active deformation modes under different loading conditions were analyzed.
ISSN:0749-6419
1879-2154
DOI:10.1016/j.ijplas.2023.103658