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.

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Title Nanoscale variation in energy dissipation in austenitic shape memory alloys in ultimate loading cycles
Author(s) Amini, Abbas
Yang, Chunhui
Cheng, Chun
Naebe, MinooORCID iD for Naebe, Minoo
Xiang, Yang
Journal name Journal of intelligent material systems and structures
Volume number 26
Issue number 17
Start page 2411
End page 2417
Total pages 7
Publisher Sage Publications
Place of publication London, Eng.
Publication date 2015-11
ISSN 1045-389X
Keyword(s) Science & Technology
Materials Science, Multidisciplinary
Materials Science
shape memory alloys
dynamic and smart systems
phase transition
Summary 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.
Language eng
DOI 10.1177/1045389X14560365
Field of Research 099999 Engineering not elsewhere classified
09 Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Sage
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