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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Dynamic Behavior of Materials VIII
Presentation Title Dynamic Tension-compression Anisotropy in a Stable Nanocrystalline Cu Alloy
Author(s) Scott Andrew Turnage, Kristopher A Darling, Chaitanya Kale, Kiran N Solanki
On-Site Speaker (Planned) Scott Andrew Turnage
Abstract Scope Recent developments in bulk processed, stable nanocrystalline materials have revealed exceptional mechanical properties under compressive load at both quasi-static and high strain rates. Here, a series of tension, compression, and tension followed by compression tests at both quasi-static (10<sup>0</sup> s<sup>-1</sup>) and dynamic (10<sup>3</sup> s<sup>-1</sup>) strain rates are employed to analyze the anisotropic material response of a NC-Cu-10at.%Ta material. The tensile behavior of these materials is analyzed and found to exhibit flow stress and ductility that deviate from that observed in compression. Further, while ductility is shown to anomalously increase in tension at strain rates above 10<sup>3</sup> s<sup>-1</sup>, the stress differential between tension and compression increases in favor of higher compressive flow stress. Mechanisms relating to the increased ductility and stress differential at high strain rate are analyzed and observed to be the result of increased twin nucleation as opposed to dislocation propagation.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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