Effect of the Cooling Time in Annealing at 350°C on the Phase Transformation Temperatures of a Ni₅₅Ti₄₅ wt. Alloy

Abstract:

When submitted to annealing thermal treatments Shape Memory Alloys have their phase transformation temperatures effected. The aim of the present work is to investigate the effects of cooling time in the phase transformation temperatures of Ni₅₅Ti₄₅ in w.t. % alloy annealed at 350°C. Samples of this alloy were maintained at 350°C for one hour and then cooled in the same furnace for 10 minutes, 1 hour and 24 hours. The phase transformation temperatures were measured by means of Differential Scanning Calorimetry (DSC) at cooling and heating rates of 20°C/min. The results show that the annealing at 350°C changed the phase transformation up to 54%. For 10 minutes cooling time the M_f temperature increase from 15,65°C to 24,1°C. For the others cooling times the phase transformation temperature did not change significantly. Therefore, the cooling time for the annealing at 350°C did not effect the phase transformation temperatures of the Ni₄₅Ti₅₅ in wt % shape memory alloy.

• Periodical: Advanced Materials Research (Volumes 1120-1121)
• Pages: 958-961
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.958
• Online since: July 2015
• Authors: Tadeu Castro da Silva, Daniel Monteiro Rosa, Edson Paulo da Silva*
• Keywords: Annealing, Phase Transformation Temperatures, Shape Memory Alloy

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