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

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

Zhu, Jia-Ning (TU Delft Team Vera Popovich)
Liu, K. (TU Delft Team Marcel Sluiter)
Riemslag, A.C. (TU Delft Team Vera Popovich)
Tichelaar, F.D. (TU Delft QN/Afdelingsbureau; Kavli institute of nanoscience Delft)
Borisov, Evgenii (Peter the Great Saint-Petersburg Polytechnic University)
Yao, Xiyu (Southern University of Science and Technology)
Popovich, Anatoly (Peter the Great Saint-Petersburg Polytechnic University)
Huizenga, R.M. (TU Delft Team Amarante Bottger)
Hermans, M.J.M. (TU Delft Team Marcel Hermans)
Popovich, V. (TU Delft Team Vera Popovich)

2023

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.

Anisotropy
Laser powder bed fusion
NiTi
Shape memory alloys
Superelasticity

http://resolver.tudelft.nl/uuid:938f6c61-3f54-44dd-95c4-494d75f568ae

https://doi.org/10.1016/j.matdes.2023.111949

0264-1275

Materials & Design, 230

Institutional Repository

journal article

© 2023 Jia-Ning Zhu, K. Liu, A.C. Riemslag, F.D. Tichelaar, Evgenii Borisov, Xiyu Yao, Anatoly Popovich, R.M. Huizenga, M.J.M. Hermans, V. Popovich