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Experimental study of one‐dimensional superelastic capability of a nearly equi‐atomic NiTi shape memory alloy
Author(s) -
Wang Y. F.,
Yue Z. F.,
Baruj A.
Publication year - 2005
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200500899
Subject(s) - shape memory alloy , materials science , nickel titanium , displacement (psychology) , diffusionless transformation , pseudoelasticity , martensite , alloy , stress (linguistics) , saturation (graph theory) , composite material , metallurgy , microstructure , mathematics , psychology , linguistics , philosophy , psychotherapist , combinatorics
A series of experimental studies have been carried out on nearly equi‐atomic NiTi shape memory alloy wires. The effects of fatigue cycles, displacement rates as well as testing temperatures on the superelastic capabilities have been studied. Under cycling loading, the threshold stresses for martensitic transformation decrease and the residule strains increase. Saturation is reached after 100 cycles. With increasing displacement rates, the critical stresses required for the martensitic transformation increase and the slopes of the upper plateau in the stress‐strain curves rise. The dissipated energy increases rapidly with increasing displacement rate, reaches a maximum value at around 6.0mm/min and then decreases as the displacement rate continues to increase. Tests also show that the threshold stresses characterizing the forward/reverse transformations increase linearly with increasing test temperature.