TY - JOUR
T1 - Phase transformations in Ni-Ti SMA spring
AU - Mahesh, K. K.
AU - Braz Fernandes, F. M.
N1 - info:eu-repo/grantAgreement/FCT/Concurso para Projectos de I&D em todos os Domínios Científicos - 2006/PTDC%2FCTM%2F66380%2F2006/PT#
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
The authors would like to acknowledge the financial support by Fundação para a Ciência e a Tecnologia – Ministério da Educação e Ciência, Portugal to CENIMAT/I3N through the Strategic Project Ref.: LA 25 – 2011-2012. KKM gratefully acknowledges the fellowship under the scheme, ‘Ciência 2007’ with Ref.:C2007-443-CENIMAT-6/Ciência2007.
PY - 2023
Y1 - 2023
N2 - Equi-atomic Nickel-Titanium (Ni-Ti) alloy is one of the prominent materials to exhibit two way shape memory effect (TWSME). Since the material by itself can change shape due to variation in temperature, it is also used as an actuator. In the present study, Ni-Ti (49.5at%Ni-Ti) alloy wire is converted into a spring coil with straight portions on either ends by shape setting. Training is provided to the spring coil portion to achieve TWSME. Separate specimens from the spring and straight portions were extracted. Phase transformations were observed in the spring and straight portions during heating and cooling. Phase transformation behaviour of the spring coil and straight portions were studied using differential scanning calorimetry (DSC). The straight portion undergoes simple thermal cycles. But the spring coil portion undergoes thermomechanical (TM) cycles due to change in shapes during heating and cooling. The thermograms obtained show difference in their nature of phase transformations. Discussion focusses on the difference in the thermograms appearing for the specimens from straight and coil portions.
AB - Equi-atomic Nickel-Titanium (Ni-Ti) alloy is one of the prominent materials to exhibit two way shape memory effect (TWSME). Since the material by itself can change shape due to variation in temperature, it is also used as an actuator. In the present study, Ni-Ti (49.5at%Ni-Ti) alloy wire is converted into a spring coil with straight portions on either ends by shape setting. Training is provided to the spring coil portion to achieve TWSME. Separate specimens from the spring and straight portions were extracted. Phase transformations were observed in the spring and straight portions during heating and cooling. Phase transformation behaviour of the spring coil and straight portions were studied using differential scanning calorimetry (DSC). The straight portion undergoes simple thermal cycles. But the spring coil portion undergoes thermomechanical (TM) cycles due to change in shapes during heating and cooling. The thermograms obtained show difference in their nature of phase transformations. Discussion focusses on the difference in the thermograms appearing for the specimens from straight and coil portions.
UR - http://www.scopus.com/inward/record.url?scp=85179584790&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/2603/1/012017
DO - 10.1088/1742-6596/2603/1/012017
M3 - Conference article
AN - SCOPUS:85179584790
SN - 1742-6588
VL - 2603
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012017
T2 - 2023 National Conference on Physics and Chemistry of Materials, NCPCM 2023
Y2 - 16 March 2023 through 18 March 2023
ER -