Non-Conventional Techniques for the Study of Phase Transitions in NiTi-Based Alloys

作者：Nespoli Adelaide; Villa Elena^*; Passaretti Francesca; Albertini Franca; Cabassi Riccardo; Pasquale Massimo; Sasso Carlo Paolo; Coisson Marco

来源：Journal of Materials Engineering and Performance, 2014, 23(7): 2491-2497.

DOI：10.1007/s11665-014-1105-6

• dilatometry
• magnetic measurement
• Seebeck coefficient
• shape memory alloy

Differential scanning calorimetry and electrical resistance measurements are the two most common techniques for the study of the phase transition path and temperatures of shape memory alloys (SMA) in stress-free condition. Besides, it is well known that internal friction measurements are also useful for this purpose. There are indeed some further techniques which are seldom used for the basic characterization of SMA transition: dilatometric analysis, magnetic measurements, and Seebeck coefficient study. In this work, we discuss the attitude of these techniques for the study of NiTi-based phase transition. Measurements were conducted on several fully annealed Ni50-x Ti50Cu (x) samples ranging from 3 to 10 at.% in Cu content, fully annealed at 850 A degrees C for 1 h in vacuum and quenched in water at room temperature. Results show that all these techniques are sensitive to phase transition, and they provide significant information about the existence of intermediate phases.

• 出版日期2014-7