Formation of two-way shape memory effect in NiTi alloy using pulsed laser irradiation

Saidjafarzoda Ilhom, Khomidkhodzha Kholikov, Peizhen Li, Dovletgeldi Seyitliyev, Zachary Thomas, Duvall Roberts, Omer San, Haluk E. Karaca, Ali O. Er

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We report an advanced laser imprinting technique with low cost, quick and minimal environmental impact. Microindents were obtained on Ni50Ti50 (at. %) SMAs using an Nd:YAG laser with 1064 nm wavelength at 10 Hz. Laser pulses at selected fluences were focused on the NiTi surface and generated pressure pulses of up to a few GPa. Scanning electron microscope (SEM) and optical microscope images showed that surface patterns with tailorable sizes can be obtained, where the depth of the patterns increased with laser power and irradiation time. Upon heating, the maximum depth recovery ratio of 30 % was observed. Recovery ratio decreased and stayed around 15 % when the amount of time and thus the indent depth was increased. Laser-induced shock wave propagation inside the material was simulated and the stress wave was shown to closely follow the rise time of the laser pulse to its peak value and initial decay. Rapid attenuation and dispersion of the stress wave were observed.

Original languageEnglish
Title of host publicationLaser-Based Micro- and Nanoprocessing XII
EditorsKunihiko Washio, Rainer Kling, Udo Klotzbach
ISBN (Electronic)9781510615250
StatePublished - 2018
EventLaser-Based Micro- and Nanoprocessing XII 2018 - San Francisco, United States
Duration: Jan 30 2018Feb 1 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceLaser-Based Micro- and Nanoprocessing XII 2018
Country/TerritoryUnited States
CitySan Francisco

Bibliographical note

Publisher Copyright:
© Copyright SPIE.


  • NiTi
  • laser plasma
  • laser-shockwave
  • microindents
  • patterning
  • shape recovery
  • simulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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