期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 139, 期 2, 页码 817-822出版社
SPRINGER
DOI: 10.1007/s10973-019-08511-2
关键词
Ni-rich NiTi; Shape memory alloy; Heating rate effect; Activation energy; Thermal properties
资金
- Eskisehir Technical University [BAP-1706F382]
In this study, the effects of heating and cooling rate on the thermal properties of high nickel-rich Ni55Ti45 shape memory alloy were investigated. Transformation temperatures and enthalpies were determined by differential scanning calorimetry. R-phase was observed with two-stage phase transformation during cooling. Transformation finish temperatures were affected, while the transformation start temperatures were not changed by heating-cooling rate. Kissinger, Takhor, and Ozawa methods were applied to find activation energy that is needed for phase transformation. The average activation energy value of 200.5 kJ mol(-1) was calculated for Ni55Ti45 alloy. The calculated activation energy was found lower than the ones reported in the literature.
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