|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermo-mechanical Response of Materials with Special Emphasis on In-situ Techniques
||The Effect of Strain Rate on the Tensile Properties of Single Crystal Ni – an In Situ Study
||Dhriti Bhattacharyya, Alan Xu, Joel Davis, Michael Saleh
|On-Site Speaker (Planned)
The effect of strain rate on the tensile properties of single crystal Ni was evaluated using in-situ micro-tensile testing in the scanning electron microscope. The samples were tested in the <100> and <110> directions, at two different nominal displacement rates – 5 nm/s and 500 nm/s (nominal average strain rates of 1.67e-4/s and 1.67e-2/s, respectively). A significant increase in the flow stress of the crystal was observed at the higher stress for both orientations. Moreover, the stress-strain behaviour of the sample oriented approximately in the <110> orientation was markedly different from that of the <100> oriented sample, exhibiting two distinct peaks in the stress. The strain-rate sensitivity exponent, m, was shown to be close to that obtained for bulk single crystal Ni, while the yield stress obtained was successfully utilized to extract reasonable values of bulk yield stress after applying corrections for the size effect and the Taylor Factor.
||Planned: Supplemental Proceedings volume