Achieving superelasticity in additively manufactured Ni-lean NiTi by crystallographic design

Jia Ning Zhu*, Kai Liu, Ton Riemslag, Frans D. Tichelaar, Evgenii Borisov, Xiyu Yao, Anatoly Popovich, Richard Huizenga, Marcel Hermans, Vera Popovich

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Superelastic metallic materials possessing large recoverable strains are widely used in automotive, aerospace and energy conversion industries. Superelastic materials working at high temperatures and with a wide temperature range are increasingly required for demanding applications. Until recently, high-temperature superelasticity has only been achievable with multicomponent alloys fabricated by complex processes. In this study, a novel framework of multi-scale models enabling texture and microstructure design is proposed for high-performance NiTi fabrication via laser powder bed fusion. Based on the developed framework, a Ni-lean Ni(49.4 at.%)-Ti alloy is, for the first time, endowed with a 4% high-temperature compressive superelasticity. A 001 texture, unfavorable for plastic slip, is created to realize enhanced functionality. The unprecedented superelasticity can be maintained up to 453 K, which is comparable with but has a wider superelastic temperature range (∼110 K) than rare earth alloyed NiTi alloys, previously only realizable with grain refinement, and other complicated post-processing operations. At the same time, its shape memory stability is also improved due to existing textured 100 martensite and intergranular precipitation of Ti2NiOx. This discovery reframes the way that we design superior performance NiTi based alloys through directly tailoring crystallographic orientations during additive manufacturing.

Original languageEnglish
Article number111949
Number of pages16
JournalMaterials and Design
Volume230
DOIs
Publication statusPublished - 2023

Keywords

  • Anisotropy
  • Laser powder bed fusion
  • NiTi
  • Shape memory alloys
  • Superelasticity

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