Fabrication of NiTi shape memory alloy by Micro-FAST

Kunlan Huang, Yi Qin, Jie Zhao, Muhammad Bin Zulkipli, Hasan Hijji

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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Abstract

A NiTi shape memory alloy, known as nitinol, has been intensively studied for last five decades. The NiTi alloy with large size is commonly produced by vacuum sintering, thermal explosion mode of self-propagating high-temperature synthesis (TE-SHS) and spark plasma sintering (SPS). These methods are, however, rarely utilized for the forming of miniature and micro-sized components and have their own limits and disadvantages, such as long process chains and low efficiency with the processes. In the study reported in this paper, an innovation in rapid powder consolidation technology, called Micro-FAST (combining micro-forming and electric-current activated sintering techniques (FAST)) is introduced for the forming of micro-components in which the loose powders are loaded directly into the die, followed by electric-sintering. In the study, Φ4.0 mm × 4.0 mm miniature cylinders were formed with pre-alloyed NiTi powders. Sintered sample with relative density of 98.65% has been fabricated at a sintering temperature of 1150 °C in a relatively short cycle time (119.5 s). Based on the results of SEM and XRD, it was found that the densified samples with Ni3Ti, NiTi and NiTi2 phases were produced.
Original languageEnglish
Title of host publication4th International Conference on New Forming Technology (ICNFT 2015)
EditorsY. Qin, A. Dean, J. Lin, S. J. Yuan, F. Vollertsen
PublisherEDP Sciences
Number of pages7
ISBN (Print)9782759818235
DOIs
Publication statusPublished - 10 Aug 2015

Publication series

NameMATEC Web of Conferences
PublisherEDP Sciences
Volume21

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Keywords

  • fabrication
  • nitinol
  • alloys
  • vacuum sintering
  • thermal explosion mode
  • spark plasma sintering
  • microforming
  • nickel
  • titanium

Cite this

Huang, K., Qin, Y., Zhao, J., Bin Zulkipli, M., & Hijji, H. (2015). Fabrication of NiTi shape memory alloy by Micro-FAST. In Y. Qin, A. Dean, J. Lin, S. J. Yuan, & F. Vollertsen (Eds.), 4th International Conference on New Forming Technology (ICNFT 2015) [10003] (MATEC Web of Conferences; Vol. 21). EDP Sciences. https://doi.org/10.1051/matecconf/20152110003