Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 113, Issue 2, Pages 859-863Publisher
SPRINGER
DOI: 10.1007/s10973-012-2817-1
Keywords
NiMnGa shape memory alloys; Thermal behavior; Entalpy change; Entropy change; Specific heat capacity
Funding
- Firat University Research-Project unit [1866]
- TUBITAK [106T583]
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The methods to determine martensitic transformation temperature, enthalpy and entropy change, specific heat capacity change with temperature, and transformation activation energies of Ni-%29.5Mn-%21Ga, Ni-%29Mn-%21Ga, Ni-%29.5Mn-%20Ga, and Ni-%28.5Mn-%20.5Ga (atomic percentage) alloys were investigated by differential scanning calorimetry. It was observed that the transformation temperature increased with an increase in atomic nickel ratio. Meanwhile, it was detected that the change in enthalpy increases with the amount of nickel. The highest values of entropy change and the heat capacity at room temperature were observed in the alloy having the least amount of nickel in it.
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