Modeling the Pseudoelastic Design Space of NiTi Fabricated by Laser Powder Bed Fusion

Natalie Zeleznik, Alejandro Hinojos, Xuesong Gao, Mohammadreza Nematollahi, Narges Shayesteh Moghaddam, Soheil Saedi, Wei Zhang, Mohammad Elahinia, Haluk Karaca, James McGuffin-Cawley, Michael Mills, Peter M. Anderson

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This work explores the underlying origins for an experimentally-observed correlation between the cyclic pseudoelastic response of Ni50.8Ti49.2 and the hatch spacing used in Laser Powder Bed Fusion (LPBF). In particular, an increase in hatch spacing from 80 to 180 µm produces a transition during cycling from a more flag-shaped to a linear pseudoelastic response, thus spanning a range of potential applications. These observations are studied through the development of a microstructural model that incorporates single crystal pseudoelastic constitutive behavior, texture, plasticity, and residual stress from the LPBF process. The model predicts that an increase in <111> and other non-<001> texture components, observed experimentally at larger hatch spacing, promotes stress redistribution between texture components, leading to greater strain ratcheting for larger hatch spacing and a more linearized stress-strain response after cycling. More generally, the model predicts that the design space for pseudoelastic response – including recoverable strain, linearization, and strain ratcheting – can be systematically varied through control of texture and residual stress from the LPBF process, leading to variations in recoverable strain and ratcheting by up to 4 %. The results suggest a rich design space for architected shape memory alloy materials and structures produced by LPBF.

Original languageEnglish
Article number103472
JournalAdditive Manufacturing
StatePublished - Mar 25 2023

Bibliographical note

Funding Information:
Financial support through the Ohio Federal Research Network Program (Award WSARC-1077-400 , Adaptive Bio-inspired Aerospace Structures Actuated by Shape Memory Alloys) is gratefully acknowledged. PMA acknowledges additional support from the National Science Foundation Independent Research/Development Program in the preparation of the manuscript.

Publisher Copyright:
© 2023 Elsevier B.V.


  • Additive manufacturing
  • Design space
  • Laser powder bed fusion
  • NiTi shape memory alloy
  • Texture

ASJC Scopus subject areas

  • Biomedical Engineering
  • Materials Science (all)
  • Engineering (miscellaneous)
  • Industrial and Manufacturing Engineering


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