Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 196, Issue 1-3, Pages 129-134Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2007.05.015
Keywords
NiTi shape memory alloy; differential scanning calorimetry (DSC); heating and cooling rate; phase transformation; transformation characteristic
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The martensitic transformation behavior, morphology and transition temperatures in NiTi-based shape memory alloys (SMAs) are strongly influenced by thermo-mechanical treatments. The present work aims to study the influence of heating/cooling rate on the transformation characteristics of a near-equiatomic NiTi SMA. There is a critical annealing temperature range where the transformation characteristics measured in the NiTi SMA are remarkably different. The changes in the transformation characteristics at different heating/cooling rates were studied by means of differential scanning calorimeter (DSC) measurements for four NiTi SMAs, which were made of the same raw material but heat-treated below and above the critical temperature. The results showed that the heating/cooling rate has strong influence on the transformation temperatures, the absorbed/released heat, and the elastic and irreversible energies during transformation. (c) 2007 Elsevier B.V All rights reserved.
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