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The effect of chemical composition on enthalpy and entropy changes of martensitic transformations in binary NiTi shape memory alloys

Khalil Allafi, J ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2009.07.135
  3. Publisher: 2009
  4. Abstract:
  5. In the present research work the binary NiTi alloys with various compositions in the range of 50.3-51 at.% Ni were used. Samples have been annealed at 850 °C for 15 min and then quenched in water. In order to characterize transformation temperatures and enthalpy changes of the forward and the reverse martensitic transformation, Differential Scanning Calorimetric (DSC) experiments were performed. The enthalpy and entropy changes as a function of Ni atomic content have been thermodynamically investigated. Results show that enthalpy and entropy changes of martensitic transformation decrease when Ni atomic content increases. The variation of enthalpy and entropy of martensitic transformation with Ni content in binary NiTi alloys were explained by thermodynamic parameters and electron concentration of alloy (e/a) respectively. © 2009 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Effect of chemicals ; Electron concentration ; Enthalpy change ; Entropy changes ; Ni content ; NiTi alloys ; NiTi shape memory alloys ; Thermodynamic parameter ; Transformation temperatures ; Binary alloys ; Cerium alloys ; Differential scanning calorimetry ; Enthalpy ; Entropy ; Martensite ; Nickel ; Scanning ; Shape memory effect ; Martensitic transformations
  8. Source: Journal of Alloys and Compounds ; Volume 487, Issue 1-2 , 2009 , Pages 363-366 ; 09258388 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925838809014881