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Thermally induced martensitic transformation and structural properties in Ni-Ta high-temperature shape memory alloys

  • Koksal Yildiz
Regular Article
  • 12 Downloads

Abstract.

The morphological, structural and martensitic phase transformation properties of the binary Ni-Ta high-temperature shape memory alloys depending on the composition via SEM-EDX, XRD and DSC observations have been investigated. It was found that the different Ta contents did not change the high-temperature shape memory behaviors of alloy samples with completed martensitic transformation above 220°C, but had a dramatic effect on the reverse transformation temperatures (\( A_{\rm s}\)) and transformation hysteresis (\( A_{\rm f}-M_{\rm f}\)) of alloy samples. As the Ta content of the alloy samples decreased, the \(A_{\rm s}\) temperatures shifted to high-temperatures (\( > 340\)°C, and the \( A_{\rm f}-M_{\rm f}\) values arose to temperatures above 100°C. However, different Ta contents did not cause considerable changes on the morphological and structural properties of the alloy samples. While a very rare dispersed NiTa2 precipitate phase was observed in the microstructure of the alloy samples with Ta contents above 25 at.%, Ni-rich areas were rarely detected in the microstructure of the alloy sample with Ta content below 25 at.%. In addition, no crack formation was observed in the microstructures of the alloy samples.

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Copyright information

© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Firat UniversityDepartment of PhysicsElazigTurkey

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