Texture, aging, and superelasticity of selective laser melting fabricated Ni-rich NiTi alloys

Soheil Saedi, Ali Sadi Turabi, Mohsen Taheri Andani, Narges Shayesteh Moghaddam, Mohammad Elahinia, Haluk Ersin Karaca

Research output: Contribution to journalArticlepeer-review

96 Scopus citations

Abstract

This work studies the impact of selective laser melting (SLM) fabrication on the microstructure and texture of Ni-rich NiTi alloy. SLM NiTi samples were fabricated with a high laser power of 250 W and 1.25 m/s scanning speed. A comprehensive aging study of as-fabricated alloys is also presented to reveal the effects of aging time and temperature on transformation behavior. The shape memory properties were investigated by shape memory effect and superelasticity experiments. It was found that although SLM fabricated samples show lower strength than the initial ingot, their sharp [001] texture along the building direction improve their superelastic response substantially. In addition, it was shown that transformation temperatures can be tailored and upon thermal treatments of 350 °C-1 h and 600 °C-1.5 h, superelastic recovery up to about 5.5% can be obtained at body and room temperatures which make these alloys very promising for potential biomedical applications.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalMaterials Science and Engineering A
Volume686
DOIs
StatePublished - Feb 16 2017

Bibliographical note

Funding Information:
The authors would like to acknowledge the financial support provided for the project ?Nitinol Commercialization Accelerator? by the Ohio Department of Development through Grants WP 10-010, and TVSF awards 14-958 and 15-791. Norwegian Nurses Organisation (NSF) support (CBET-0731087) is also appreciated. We would also like to acknowledge contributions of Dr. X. Wen and SECAT, Center of the Aluminium Technology of University of Kentucky.

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Additive manufacturing
  • Microstructure
  • NiTi
  • Selective laser melting
  • Shape memory alloy
  • Superelasticity

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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