Nanoscale variation in energy dissipation in austenitic shape memory alloys in ultimate loading cycles
Amini, Abbas, Yang, Chunhui, Cheng, Chun, Naebe, Minoo and Xiang, Yang 2015, Nanoscale variation in energy dissipation in austenitic shape memory alloys in ultimate loading cycles, Journal of intelligent material systems and structures, vol. 26, no. 17, pp. 2411-2417, doi: 10.1177/1045389X14560365.
Attached Files
Name
Description
MIMEType
Size
Downloads
Title
Nanoscale variation in energy dissipation in austenitic shape memory alloys in ultimate loading cycles
Wavy behaviours of hysteresis energy variation in nanoscale bulk of thermomechanical austenitic NiTi shape memory alloy are reported in ultimate nanoindentation loading cycles. One sharp and two spherical tips were used while two loading-unloading rates were applied. For comparison, another austenitic copper-based shape memory alloy, CuAlNi shape memory alloy, and a metal with no phase transition, elastoplastic Cu, were investigated. In shape memory alloys, the hysteresis energy variation ultimately undergoes a linear decrease with internal wavy fluctuations and no stabilisation was observed. The internal energy fluctuation in these alloys was found dissimilar depending on the loading-unloading rate and the indentation tip geometry. In contrast, there was an absence of both overall and internal variations in hysteresis energy for Cu after the second loading cycle. The underlying physics of these variations is discussed and found to be attributed to both the created dislocations and ratcheting thermal-mechanical behaviour of the phase-transformed volume in shape memory alloys.
Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.