Effect of different stages of deformation on the microstructure evolution of Ti-rich NiTi shape memory alloy

Ghazal Tadayyon, Yina Guo, Mohammad Mazinani, Seyed Mojtaba Zebarjad, Peter Tiernan, Syed A.M. Tofail, Manus J.P. Biggs

Research output: Contribution to journalArticlepeer-review

Abstract

The main objective of this work was to investigate the thermomechanical behavior and microstructural changes of a Ti-rich NiTi shape memory alloy (SMA). The microstructural and texture evolution of aged NiTi alloy at different degrees of deformation were elicited by transmission electron microscopy (TEM). An effort was made to correlate results obtained from the tensile test with results from microstructure studies. The undeformed sample reveals a self-accommodated morphology with straight and well defined twin boundaries. At different stages of deformation, diverse mechanisms were involved. These mechanisms include marstraining, detwinning accompanied by dislocation movement, and finally, severe plastic deformation, subdivision and amorphization of the matrix. Under increasing strains, high density lattice defects were generated and the morphology of B19’ became disordered.

Original languageEnglish
Pages (from-to)51-66
Number of pages16
JournalMaterials Characterization
Volume125
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • Detwinning
  • NiTi shape memory alloys
  • Plastic deformation mechanisms
  • Strain burst
  • Transmission electron microscopy

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