Phase transformation mechanisms of NiTi shape memory alloy during electromagnetic pulse welding of Al/NiTi dissimilar joints

Jilin Xie, Yuhua Chen, Hongwei Wang, Timing Zhang, Min Zheng, Shanlin Wang, Limeng Yin, Jiajia Shen, J. P. Oliveira

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The phase transformation mechanisms of NiTi shape memory alloy (SMA) during electromagnetic pulse welding (EMPW) of Al/NiTi dissimilar alloy joints were studied. Two types of amorphization behaviors were observed in the NiTi SMA of the Al/NiTi dissimilar joint. These are: i) fast cooling-induced amorphization of the joint interfacial reaction layer; and ii) severe deformation-induced amorphization. Additionally, the martensitic transformation was observed in the NiTi SMA during the high strain rate plastic deformation imposed by the EMPW process. The study shows that the formation of B19' martensite during high strain rate plastic deformation of NiTi SMA is influenced by both the strain rate and the peak pressure of the deformation during welding.
Original languageEnglish
Article number146119
Number of pages6
JournalMaterials Science and Engineering: A
Volume893
DOIs
Publication statusPublished - Feb 2024

Keywords

  • Al/NiTi dissimilar alloys joints
  • Amorphization
  • Electromagnetic pulse welding
  • Martensite transformation
  • NiTi shape memory alloy

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