Bimodal nanocrystallization of NiTi shape memory alloy by laser shock peening and post-deformation annealing

Chang Ye, Sergey Suslov, Xueling Fei, Gary J. Cheng

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In this paper, surface nanocrystallization of NiTi intermetallic alloy by a novel method is reported. The NiTi alloy is processed by laser shock peening (LSP) and controlled annealing. The microstructure of the NiTi alloy after processing is characterized by transmission electron microscopy. At the top surface of the material, a nanostructure with bimodal grains is obtained. The mechanism of the formation of the bimodal microstructure is discussed. At the material subsurface, deformation twins are generated by LSP and retained after controlled annealing. Tensile test results showed that both strength and ductility are significantly improved through LSP and controlled annealing.

Original languageEnglish
Pages (from-to)7219-7227
Number of pages9
JournalActa Materialia
Issue number19
Publication statusPublished - Nov 2011
Externally publishedYes



  • Amorphization
  • Laser shock peening (LSP)
  • Nanocrystallization
  • Post deformation annealing
  • Shape memory alloys (SMAs)

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

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