Factors affecting the generation of stress-assisted two-way memory effect in NiTi shape memory alloy

On the mechanisms of two-way memory effect and stress-assisted two-way memory effect in NiTi shape memory alloy

“…After releasing constrained stress at the end of second heating and continued with stress-free thermal cycling generated TWME, ε TW . Unlike in the previous study [8,9], the maximum ε SATW and ε TW were both achieved at 18% pre-strain. The predominant mechanisms responsible for the maximum SATWME and TWME generated at 18% pre-strain in this case, is investigated further in light of partial reverse transformation.…”

On the transformation behaviour of NiTi particulate reinforced AA2124 composites

“…The transformation behaviour in pure systems is known to be sensitive not only to compositional variations [20][21][22][23][24][25][26], heat treatment [27,28] and applied stress [29], but also to transformation cycles [26,30,58]. So far, the NiTi transformation behaviour has been studied using different tools, such as electrical resistivity [22,31], differential scanning calorimetry (DSC) [27,28], internal friction measurements [22,23,30,32,33], magnetic susceptibility [34] and thermoelectric power [31].…”

Effect of mechanical cycling on stabilizing the transformation behaviour of NiTi shape memory alloys

“…In most of these applications, the NiTi devices are often expected to perform the desired operation repeatedly without any significant change in their mechanical response. These repeated transformation cycles causes changes in such aspects of the transformation behaviour as the critical transformation stresses, the transformation temperatures, the recoverable strain or the mechanical hysteresis, depending on whether it is mechanical cycling in martensitic range [4] or in pseudoelastic range [5,6], thermal cycling [7][8][9] or thermomechanical cycling to develop the two-way shape memory effect [10][11][12][13][14]. As discussed by Liu et al [7], all these effects * Corresponding author.…”